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That’s what you want. I just picked up a JDM K24a as well. Paid $850 which seemed fair for how complete it is. The head on mine is stamped RBB-3. in doing my research prior to my purchase there was some miss information that some RBB-2s and all RBB-3 heads were the same as the US 06-08 K24A2 with the updates. That does not seem to be the case as I measured the TB intake opening and it’s just over 60mm not the 64mm like the 06-08.
 

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That’s what you want. I just picked up a JDM K24a as well. Paid $850 which seemed fair for how complete it is. The head on mine is stamped RBB-3. in doing my research prior to my purchase there was some miss information that some RBB-2s and all RBB-3 heads were the same as the US 06-08 K24A2 with the updates. That does not seem to be the case as I measured the TB intake opening and it’s just over 60mm not the 64mm like the 06-08.
The numbers after the RBB-(#) on the heads are more for a reference of around when the head may have been made/machined (like a batch number) and not directly related to a specific year.
However, you RBB-3 maybe have just been from a newer car compared to a RBB-1 head.

Having said that, ALL 'JDM K24A' engines (with VTEC on both cams) are all comparable to 04/05 K24a2 USDM engines.
 

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Agree, do you think an 06-08 TSX manifold would bolt up to my RAA base? Very easy to swap that part and cheaper to only buy the actual intake without the injector base if they are the same.
 

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Agree, do you think an 06-08 TSX manifold would bolt up to my RAA base? Very easy to swap that part and cheaper to only buy the actual intake without the injector base if they are the same.
Yes the injector bases are the same but the 06-08 intake/plenum part is bigger. My cousin actually did this swap on his Accord as well (Swapped Accord intake manifold to 06+ TSX intake manifold & J37 TB) and it was very responsive compared to the Accord. He also did a comparison between stock throttle body and J37 (with tsx manifold on stock accord engine) and it was night and day. We are both actually in the process of doing Built K24a2 with RSP heads.
Just throwing this out there, if you don't have the 06+ tsx manifold already, he would gladly sell to you as he's buying my RBC off of me and I'm moving on to a bigger manifold.
 

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I have access to one already just not sure it’s going to be worth the extra cost for the manifold and adapter plate. I am going to run this thing totally stock and it should make enough power that I will probably have to detune it a bit to stay in class anyway. Just exploring options should I need some extra lo cost HP.

be curious to see before and after dyno charts of a motor that had the 04-05 manifold swapped to an 06-08 to see what it really does without the larger valves and cams.
 

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Pardon me from threadjacking but I didn't want to create another thread for this. I'm new to the site and I've been looking at K24s in the market and it seems like JDM K24A are the most common rather than the TSXs nowadays (i'm from US). Assuming I ended up with a High Comp RBB JDM K24A, aside from disabling the VTP for the JDM K24A, what else do I need to change to make it run like a stock TSX engine?
 

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I will try to help as I went through this for the last four months shopping for US based K24A2s. From what I have learned the JDM 24A is basically the same as the 04-05 US TSX motor. The difference is the alternator and water pump housing are unique to the JDM motor. So you need to get those if you don’t have them already. i got my housing from a junk yard CRV with the K24A and my alternator is from a RSX base model because that’s the harness I am using. There are lots of threads on the TB and that really depends on if your doing cable or drive by wire. Hope that helps some and others may know more than I on this, this is just what I have learned.
 

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Thank you very much! Please correct me if my understanding is wrong.

So I have a blown K20A3 EP3 which prompted me to upgrade to K24 and all I can find as of the moment are the JDM K24s. My question is, can I use all the accessories I have from my K20A3 and should fit the JDM K24 no problems, correct?
 
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