K20 vs k24 head.
Jan 17, 2007 · Hey guys! I'm new to K20a.
K20 vs k24 head. May 17, 2022 · So from what I’ve read a prb or other high flowing head on a k24 bottom end is generally more responsive to mods and puts down a bit more power than k20a2 or k20z3 swap. Its not the most reliable engine ever built, but Honda (especially in the early years, when Honda put a lot more emphasis on performance) struck an excellent balance between performance and reliability. k24a2 (tsx-short block), and k24a1 (accord long-block). The reason I thought the k24 redlines at 7600 vs the K20 which goes to 8600 is that the piston speeds from the stroke and compression. Luangrath actually starts off the build with the head, installing the valve seals and valves. Which would be better to start off with; k24a2 motor from the TSX or k20/k24 frank motor. Apr 13, 2025 · This approach takes advantage of the K20 head’s superior flow characteristics and typically higher-performance valvetrain while retaining the K24’s larger displacement. It's known as the Frankenstein K series, or K20/24 hybrid. 4L vs. K20 vs k24? These are very similar engines and there is no replacement for displacement as they say so the K24 wins. Jan 5, 2023 · The element in stock form has the k24a4 head. 5:1 Nippon Racing Pistons (They are cast but they are QUALITY, this Jun 13, 2011 · BUILD 1 k24 bottomend with 2009 tsx pistons and rods k20 type arrrrrrrrrrrrrrrr head with k20z3 cams stock k20a type arrrr valve springs, rbc manifold 236 hp BUILD 2 k24 with . orggiven the dyno is comparing the FD2 RSP head vs. Dec 22, 2008 · The K24A1 Headgasket that is to be used with the K20 style head on a K24 block, part# is 12251-PPA-004 Just installed, it is identical except an 88mm bore. I'm personally doing a k24a swap into my 8th gen and switching over the k20 intake manifold and some other bolt ons to make the top end still feel smooth. Aug 7, 2015 · The frank will out perform the K24 long block every single time, stock bottom end or not. Jan 17, 2007 · Hey guys! I'm new to K20a. The tsx head has good midrange but at high RPM, the k20a2 flows more. 5 over 2009 tsx pistons and rods k24a2 2004 tsx head with k20 arrrrrrrrrrrrrrrrrrrrrr cams supertech 95 psi seat springs, RRC manifold 222 hp Nov 9, 2012 · Trying to determine which head gasket I should use on my build. 5:1 pistons in a K24, it would shoot the compression up towards 14:1. Its definitely up there. I think the k24a1 accord block is taller and hence has better piston/valve clearance if you plan on running the vtc beyond 40 degrees. Feb 16, 2024 · K20 vs K24 As part of the Honda K-Series, both the K20 and K24 have made a name for themselves for many of the same reasons. Uncover the performance advantages of a K24 with a K20 head and understand the essential differences between K20 vs K24. To match, he has an LA sleeved block for extra rigidity at higher boost levels. Nov 25, 2024 · Wiseco Forged Pistons Acura Honda K24A1 K24A2 K24A3 K24A4 K24A8 87mm STD -9 cc 10. The stock head on the k24 limits you to 7500 ish revs. I know that the K20a and K24a2 respond well to boost, but I am unsure about the F20c. Jan 6, 2025 · The K-series spans many years. im using cosmetic head gasket n top rad hoses getting real hard like head gasket is bad or liftin up idk something is wrong well i wanna put factory head gasket what head gasket u In today’s video, Zach dives into the similarities and differences between the Honda K20 and K24 engines, two of the most iconic powerplants in the Honda lineup. This makes supporting the K-series swap more complex than older swaps as there are many variances to account for. There are 4 different chassis from which you can locate a bottom end as Honda releases more K24 engines this list may Aug 18, 2021 · I have a k24z3 (2010 tsx) block w/k20z1 head in my integra right now it runs great. 2:1 Because K20 and K24 heads all share the same 50. The K20’s smaller displacement allows the engine to rev higher, resulting in higher horsepower. My ep3 already has the k24 swap with kpro. would you swap in a K20a2 head or would you just keep the K24a2 motor whole? Apr 10, 2007 · The best combination for good power and good torque would be the k20/k24 head and block combination. Make sure that you have both Dowlpins installed on the intake side of the top of the block to properly lign up the cylinders. Throughout its lifespan, the K24 introduced several advancements, such as friction-reducing technology and electronically Jun 8, 2022 · Hey everyone, I am in the process of building an all motor K24. Both engines offer their own unique advantages and disadvantages, making it difficult for enthusiasts to decide which is the better option. 1 or so. This platform has long been neglected due to a lack of camshaft and valvetrain availability, and the single port exhaust design that has been touted as an Achilles heel when compared to traditional 4 port K20 cyli Aug 21, 2008 · Great thread debating on whether i should do a k20a or k20 head k24 block to put in my EG Chris you should post the parts list on the thread and make it a sticky. The overall engine architecture and structure of both the K20 and K24 are remarkably similar, with only a few key differences separating the two engine families. Ill be doing a k20/K24 build and Im wondering what, if any, advantages the PRB-1 head has over Mar 9, 2012 · A forum community dedicated to Honda and Acura K Series engine platform owners and enthusiasts. Jun 7, 2022 · In this article, we cover the similarities and differences between the Honda K20 vs K24 engine. 3 compression points Oct 10, 2020 · The k24 cams are better than the z3, bigger primary and vtec lobes. if your plan is to go with a hybrid k24/k20 don't bother with the k24a2. Oct 8, 2009 · I know the k24a2 has the biggest factory OEM cams too. Right now im trying to decide if i should do the cheaper option and build my k20 over the k24 swap because with full valvetrain, cams and a balanced stock bottom end with aftermarket pistons with Attention is on the dark brown and lime green power curves (two highest shown). The casting for this head leaves alot of room for porting which would dramatically increase the flow of the head. Also for 3 grand less than a tdi north turbo . Mar 9, 2007 · RSX-S (04-05) comes with PRC (type R) cams matted to PRC (type R) manifold in A2 with KRO is close to type R k20a performance on Kpro. 300" in comparison to the K24A2 head and the K24A1 head. Obvious gains are to be had high in the rpm range with the k20 head as shown. Nov 19, 2014 · My head gasket needed to be thicker than the previous stock headgasket on my K20. The K20 and K24 had a lot of race-inspired features (take a look at the size of the intake and exhaust ports) and had tremendous specific output for the engine's The NEW Pro R40 CNC cylinder head is the ultimate cylinder head for your K24Z powered street or race car. ” It Jun 21, 2022 · The different versions of the k20 head started in 2001 with the PRB-1 head casting found in the Honda Interga Type R (DC5) & Acura RSX Type S starting in 2002. this is a great match for us since we use RBC (accord euro R) manifold stock and the way our heads are ported. The most obvious and significant difference between the two engine families is displacement. Hey all I need some insite to this K24/K20 head spec's. Mar 17, 2008 · The other differences between the K24 applications, most notably the presence of EGR, used on the Accord and the Element, and a variable length intake runner system, found on the CR-V, are irrelevant since we're not using the K24 head. The k20a2 should be a direct swap for your car for the most part. We think this swap is a huge game-changer for the Miata world. Nov 25, 2021 · Lotus said: if you like to rev the engine, build a k20. Jan 27, 2022 · K20/K24 HYBRID ENGINE BUILD GUIDES This engine buildup consists of a 2. They spin the same way, they have the same bore spacing, and other similarities. 1 'which is native to the K20a2' the K24a2 will easily out perform the K20a2. May 7, 2013 · Would porting and polishing the Z7 head make it flow equal to the K20 head? HPD's race motor is the K24 with the K20 head. My goal for the engine is to be a dailyable 500whp, with great power, and good torque. :wwhat: May 17, 2006 · Hey wanted to see if there was any interest to see how this motor was put together, its a customers simple build k24 and should put down 220whp+ / 170wtq. Dec 12, 2007 · The same reason people inquire about a head swap on the K20a3 engines is the same reason why you would want it on the K24 engines. Guys essentially the point of the K20a Head swap onto the other K24's is to gain '3 lobe Vtec' something the Unique K24a2 already has except more displacement than a K20 and less compression so it has more potentialAt 11:5. uprated valve springs and proper tune is a given. If you’re on a tight budget, the K20 is probably the way to go. The z3 head is only a few cfm behind the PRB type s casting. If you are planning to eventually go turbo, and you have the tSX head Sep 6, 2017 · K20 Head Gasket (You must use the K24 head gasket due to the increased bore) You will also need a service manual for one of the K24 motors or K20A2 for all the torque specs. For a daily driver torque is best for me because due to Want to upgrade your Honda engine? Compare the K20 vs K24 and learn the pros and cons of each. 4 Liters Untamed Autowave builds a poor man's TSX motor for swapping into an EM2 Civic chassis. I'm planning on doing a k24 block with a k20 head build. Nov 21, 2008 · Both the K20 and K24 are well designed engines that have a specific role. On an all motor setup, a 2004-2005 TSX head in stock form will not make as much power up high as a k20a2 head assuming decent cams etc. If you are forsure boosting it, the k24 head design is better for spooling a turbo. The RBB head flows so poorly in comparison to the PRB head, the head swap alone will liven the motor up. 5cc combustion chamber volume, the compression ratio will stay the same regardless of whether you these pistons in a K24 block with a K24 head, or a K24 block with a K20 head. K24: The Ultimate Honda Engine Swap ShowdownThinking about an engine swap for your project car? Look no further than Honda's legendary K-series engin Jun 11, 2017 · Hey, did the k24a2 timing cover fit for this head swap? Have a '12 si and a 06 TSX part out car, engines healthy , was debating on swapping the k24a2 head to the k24z7 block, I know this is old but . Everything is going to be upgraded in the head and the block bulletproof'd. Come join the discussion about performance, modifications, troubleshooting, power-adders, racing, maintenance, and more! Aug 18, 2023 · The K20 vs K24 discussions are mostly in relation to the Honda Civic, which is a favorite among performance-loving car enthusiasts. At 8000 rpm, the k20 head rocketed past K20 vs. I got the idea after listing the VTC sensor in a thread on here, All Mar 26, 2025 · The K24’s design is similar to that of its predecessor, the 2-liter K20. 4 Piston Racing is your one stop shop for High Performance Cylinder Heads. Any type of positive feedback is appreciated. Dec 15, 2005 · K20 VS K24 Debate debate k20 k24 Jump to Latest 21K views 52 replies 20 participants last post by NJslvrTypeS Dec 23, 2005 May 20, 2004 · There are some similarities with the F20C and K20A motors. It’s still very feasible to boost a k24 just won’t handle quite as much but it’s typically still plenty for most ppl. This month we look at the bottom-end build, fortified Dec 6, 2010 · the k20z3 head flows a little better but nothing major. if i plan on doing wet sleeves,all forged internals, and type s pump upgrade does it matter if i use a k24a4 over the more popular k24a2 block?the engine will be going into a 04 accord. conversion ! Even with the popularity of the K-Series engine, a lot of people don’t know if they should swap a K20 or a K24 in their car, so today we’re going to break it down and see which one is better. Any advice and insight would be greatly… Aug 25, 2023 · I have a question - why the K20 cylinder heads (well, some of them) are making more air throughput than K24? I mean, the K24 ones have even bigger intake valves after all Why isn't it better to just port K24 top (together with the intake manifold) and just exchange the cam shafts instead of swapping the whole cylinder head? Sep 25, 2012 · A forum community dedicated to Honda and Acura K Series engine platform owners and enthusiasts. Thanks. The Honda K-series engine is a line of four-cylinder four-stroke car engines introduced in 2001. more Nov 8, 2022 · With over forty variants, anyone would switch heads from left and right because of confusion between K20 and K24 engines. on some k24 setups, the k24a2 head and intake manifold were more beneficial. its a little different since im using the crank position sensor from k20/k24a. Jul 30, 2025 · Explore the Honda K24 engine in detail—specs, best variants, swap tips, and why it’s a favorite for tuners and daily drivers alike. K20 was designed for a good performing and economical compact that is fun to drive. A 2006-2007 TSX head will probaby make more power than a stock k20a2 head. Jun 4, 2009 · just use the k20z3 head if you're running a k20 block. Jun 25, 2010 · Thanks Niko's. K20A2 and K24A2 specs and performance Dec 23, 2024 · In the comparison table between the K24 and K20 engines, you'll notice that the K20, despite its smaller size, can produce way more horsepower at higher RPMs. Specs, hp, torque, and tuning tips for K24A2, K24A4, K24Z3, and more. Nov 13, 2004 · Hello. Nov 1, 2005 · K24 Engine Block/K20 Cylinder Head Build - 2. Though, year stamp and the 36mm intake valves are pretty much a dead giveaway of an 06-08 head. So, if you put 88mm K20 12. Is it worth building the k24 head or should i get a k20 head and build that. The largest being the lack of header clearance with the stock Miata subframe. Now obviously, this is more sophisticated than just simply switching out the head, but there are build guides online and this combo has proven to be very good. Now, the K20 is a natural fit in the Civic, but the K24 will require a lot of work, which is not going to be easy or cheap. Thanks to the specialty tool, the springs and retainers are also installed. shaft/if K20 int. 9 Jul 16, 2006 · Can someone that has flowed the K24A2 and the K20A2 provide some flow data? What I've found by performing a search is a table stating that the K20A2 head flows pretty bad at valve lifts below 0. Better head, more potential, more power. Ive just bought a k20r bott. This version flows very well and can flow enough for the K24 engine to reach 260-270bhp without modifications. It’s the best of both worlds. Swapping the K20 head to a K24 is a common upgrade and provides a better flowing head and more desirable camshaft profile. "Back from the dead with another test on a different motor 2008 stock TSX (longblock) with: RRC IM, Injen Intake, P2R TB spacer, Header & exhaust Jan 20, 2025 · The K20 engine is known for its high-revving nature and sporty performance, while the K24 offers greater displacement and torque. They say the speeds of the pistons at 7600rpm in a k24 is the same as the speed of the pistons at 8600rpm in a k20. These are a must have!! Another Must Have is the PRL Type-S Oil Pump swap kit! Apr 22, 2013 · what up k20 i have k24 accord block 87. The Honda Euro R Accord was also given a K20 head with the RBC casting the same as the K20z3 head. May 22, 2016 · Found on the 04-08 TSX. However, the most common swap regardless of this fact is using a K24 block from a non-A2 model with a K20A2 head. Sep 17, 2020 · No description has been added to this video. Jan 5, 2017 · They show the compression with a K24 block and K20 head because if you used a K24 head on a k24 block with the respective piston, the compression would bump approximately . There is a lot of speculation on how the two engines might be melded together to get the F20C's 240hp performance with the FWD 6spd transmission of the Aug 9, 2023 · First I would like to mention I’m new to honda and I’m curious which is better for making power, the k20 or the k24, the advantages and disadvantages to both, why someone would use the k20 head on a k24, if a k24 with a k20 head is a good idea/option what would it require, would a k20z3 6 speed Feb 16, 2010 · I've spent a good part of 2 days reading about my options as far as improving torque goes, seeing as how I will soon be investing in the cams / flashpro to "finish off" the top end of my engine. However, this is not just for the electrical sensors but anything that is used to actuate a particular engine function. Dec 24, 2019 · Usually, the K20 is cheaper to buy than a K24 due to availability, especially the A2 model found in the TSX. It's only 10:5. Either K24A1 or K24A2? Build includes: K24A1 block K20Z3 head 87. You can also use DSS 2. I need opinions from people who have K20a2 & K24a2 swaps in their egs, dcs, and eks. K24a4 (accord) block was dissasembled, only thing The K20Z3 head has the good flowing intake ports that the K series engine is known for. Mar 21, 2011 · The head cc will be very close to the same size. In this article, we will provide a full comparison between the Honda K20 and K24 engines to help you make an informed decision. Unlike older Honda engines there are more parts variation in the K-series engine / transmission family. If pricing isn’t an issue for you, the K24 provides more low-end torque, and overall more performance potential. Aug 20, 2025 · Discover the best K24 engine for your build. Feb 17, 2015 · I got a good deal on 2008 Honda Civic Si RBC-2 cylinder head. end and wanting to know it a k24 cylinder head would work. For the sake of ease, and your sanity, it may be best to install the K24 without opening it up and messing around with a head and oil pump swap. 5 Apr 2, 2015 · K24 oil pumps can't handle anything above the stock K24 redline for too long until cavitation. But If you put the dohc k20 head on a k24 bottom end with forged internals and supporting mods you'll see 280+ bhp and 200+ ft/lbs torque that will rev to 8500 rpmwithout a turbo. If you really want to ensure your block doesn't call it quits early, you'd look for beefier rods and rod bolts that'll handle the added revs with ease. if you want to make it really fast, k20 or k24, turbocharge it or fit a suitably big blower. the RBB 36mm head, it still gives a good comparison between the K20 and K24 style heads. K24a2, K20a, or F20c For A RWD swap with boost. When swapping a K20A (EP3/DC5), K20A2, or K20Z1 head onto a K24A1/A2/A4 block the following parts are required: The K20 heads are much higher flowing which helps a lot with your top end power and the K24 blocks give you the torque you want on the lower end of the rev range. I am looking to do the k20 head on k24 block set up. org, and I'm planning on doing a K-swap in my car. However, it features a larger displacement (2. Whereas the k20 (depending on which one) will make good top end all motor power. :up: Apr 5, 2011 · Which ones? -hybrid racing K swap axels? -external joint Bserie; axle K20/K24; internal joint K24/20 (if K24 int. Determining which one is “better” largely depends on individual preferences and specific use cases. Sep 10, 2013 · Okay so a few of you may know or may have heard that im looking to go all motor built for my DD. Good flowing ports will enable us to reach our turbocharged power goals without expensive and time consuming porting and head work. Hence the larger displacement and emphasis on torque. Eh worth a shot. It seems as if the k24a2 block swap would be the best way to do this, but that is a lot of work Dec 19, 2019 · He has a K20 Type R head (RSP), the highest flowing of all the different K-series heads. 4 liter bottom end and one of 2 different combinations of heads. 5 bore fac sleeves 14. The brown is a curve using a stock port K24a2 (RBB) head and the green is a 4piston pro 156 cnc ported K20a2 (PRB) head. “As far as which one is actually better, it basically comes down to cost. But i need abit of advice please. if you like more torque, build a k24. Which would be the best? Hey there, so I've had an idea in my head for doing a RWD boosted K series, or boosted F20c swap. Some difference examples of this are: Block heights (K20 vs K24) Head castings Oil pans Shifter arm configuration Transmission case (RSX/Civic SI Dec 17, 2009 · For me, once I tear apart my K24A1 and K20Z3 (to use K20Z3 head with K24A1 block), I'll have a spare K20 block and K24 head. Unfortunately I DONT KNOW what k24 I have as its a JDM engine and stamped K24 only. all heads listed above. The z3 head was the right choice, z1 is the same as a2 with the water port on the front of the head and not the side. Make an informed decision now! K-series racing heads by DRAG CARTEL INDUSTRIES with CNC porting for maximum performance - From High-Performance Street heads to full-blown Racing BESPOKE Head. It may not hurt to keep the k20 cams in case you do forced induction down the road and like those Sep 27, 2019 · A K24Z3 engine is a very solid option for 200-210whp, but in order to make much more power, a K20 head (or K24A2 head) needs to be swapped on, which comes with its own share of complications. This way, one can have the benefit of displacement and still keep the high-performance of an A2 head. Are the two cylinder the same cc? im going to change the springs and cams to type r once thanks Dec 14, 2023 · I am currently in the process of specifying and purchasing parts for my K24/20 Frank build (all motor) and I am looking for advice on the best Head spec / Cam package to use for the build from those with the knowledge and experience? Engine will be in a non Honda Car that is used for street Aug 16, 2010 · I have 2007 civic ex and I'm wondering which would be better based off or your personal opinions and experiences. Typically stamped with “RBB-2” on head casting. 2 comp piston with k20a2 head cartel 4s in head. . Aug 16, 2012 · Guys, I am planning on a boosted k20/24 with a goal of 750-800hp. I know most of the Dec 29, 2024 · Looking to buy an k24a for my mr2 but I'm unsure what the difference is between the two castings is. Valvetrain for the K20 isn't a problem since it's made to go past 8000 already. Mar 19, 2022 · Does anyone know where I can find a list of all Honda Cylinder head part numbers with (hopefully) details about each one? I've done a bit of searching, but failed. The first would be a complete RSX-S head with intake manifold and throttle body or a TSX head with an RSX-S intake manifold and throttle body. The problem I am having is I am using a complete TSX K24 engine and I want to do 10,5:1 forged pistons what I have been told is that there is no pistons made for the TSX K24 2. What better than to build a new engine with spare parts? Jul 13, 2024 · The k20 is easier to tune. Understand? Sep 14, 2007 · Are these heads identical? Say you got your hands on a K24a2 motor. We eat, sleep, and breathe Cylinder Heads, and day after day continue to push for new developments. Aug 2, 2005 · TSX K24 head and K20 head what is the difference between the two. May 1, 2024 · Explore the benefits and reasons for swapping a K20 head onto a K24 block. The K24a2 head had massive gains over the k20 head everywhere below 8000 rpm. RBB version - This version comes on the Honda Accord K24a3 and other vehicles equipped with the higher spec K24 engines. I just blew out my piston rings in My gsr swapped eg and I’m weighing my options. After its launch in 2001, the 2. These are the specs: -K24a4 (04 accord) block, with oil squirters and k20 oil cooler added -12. It's currently still at the machine shop, hasn't yet been balanced. Apr 22, 2005 · Apart from these two 'styles', both K24 and K20 gaskets are interchangable (one way only due to the difference in bore - you can't use the K20 on a K24). The combustion chamber is a fast burning low included angle design that is very beneficial for turbocharging. Jun 19, 2019 · “Basically, a K24 with a K20 head with the performance version of the iVTEC such as a K20A2 is the best way to go,” he concludes. 0L) and produces more torque. Get your current gasket, go through the manuals and compare pictures (looking at coolant holes) to see what other models use the same gasket. The K24a2 was designed for a good performing but option ladened land yacht where more torque is required to get it off the line. The K20 pistons are spec'd for the 86mm crank, and require a much larger dome to attain the higher compression ratio. K24head is very semilar to k20 head, different are : other coolant lines, coolant hoses, EGR, I would like know, K20 cams fits for K24 head? I`m really don`t know why most poeples make swap k24bloxk and head from k20, but is really possible using k24 head, only need cams Aug 9, 2019 · KMiata is proud to announce a brand new engine swap option for the NA and NB Miata chassis. At some point ima rebuild the engine and I The shorter stroke of a k20 handles boost pressures better than that of a k24. 2. Jul 23, 2017 · Could someone please explain what the differences are between these two heads k20a2 and the k20z1. Looking to make around 5-600whp. InlinePro makes the kit for k24z7. shaft; OR INTERNAL K20 JOINT IS SAME K24?) ANSWER Do you use the Hasport engine mounts? If you use Hasport mounts you can use 'hybridation' mounts with B-series external joint and DC5 internal. It was determined that the K20A2 head Sep 1, 2023 · The Honda K20 and K24 are two of the most popular engines for Honda enthusiasts. Dive into a comprehensive guide that covers all aspects of a K24 block K20 head swap. Per my search there seems to be a mix of these in high hp setups. motor will be going in this weekend and then tuning should start from there on a dynapack. If you're looking at strictly doing a K-swap a common thing to do is, to take a K24 block and use a K20 head with it. Our current KMiata swap Jul 26, 2025 · A favorite among tuners and commuters, the Honda K-Series engines have powered everything from everyday driving to track days, and everything in between. Dec 18, 2006 · This is a comparison of every major sensor located on the Cylinder Head/Engine block of a K24/20. i would only pick up a k24a2 if you're going to use the entire longblock as a direct replacement for your stock k20z3. Oct 19, 2014 · Via K20A. i'm too lazy to find links so take my info with a grain of salt :dance: edit: if it's the tsx headi think the ports aren't as opened up as the k20a2/z1/z3. Dec 20, 2020 · First you will need a K20/k24 cylinder head preferably '06-10' k20z3 the head will need to be modified or it will leak!! Ill post pic for Reference: note use k24z7 headgasket You Will need head studs. The k24 just naturally has the better power band. It’s still a K series, but with some significant changes that will bring broad appeal to lots more Miata racers and enthusiasts at a lower price point. Background First, here’s some background on this project. Dec 9, 2010 · Why wouldd anyone choose to modify a N/a k20? When it seems to me that a K24 would make better power. Shares same head layout as K20Z3 and FD2 head w/side mounted water neck but ports are not the same, are smaller and flow weak vs. 4-liter K24 debuted in the Honda CR-V with the original K24A1 variation. The K-series engines are equipped with DOHC valvetrains and use roller rockers on the cylinder head to reduce friction. if you stuck those cams in Z3 head with Kpro gains will be well over 200whp with CAI/RH/E. Come join the discussion about performance, modifications, troubleshooting, power-adders, racing, maintenance, and more! Jan 26, 2017 · Best way to know if you have an 04-05 or 06-08 RBB head is by measuring the intake valve head diameter, checking the camshafts, and checking circle year stamp. before my Apr 14, 2009 · k20 vs k24 head help please Great forum and so much info. I've helped my cous install a K20A2 last year into his ek and though about doing the swap myself this year. Is there any major advantage or disadvantage to a port and polished head. mspqfghkfogsoc8uq7l92d79hqq9ksmjqncrd2i1cdxqp45hgn4twtr0