J35Z3 what difference between it and J35A8 - Honda Accord Forum : V6 Performance Accord Forums
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Old September 10th, 2014, 07:19 AM   #1
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J35Z3 what difference between it and J35A8

Hey guys curious i have 2 J35Z3 long blocks and was wondering whats the difference between the Z3 and the A8 in the RL ?
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Old September 10th, 2014, 10:49 PM   #2
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I was wondering the same and took a look at some blow-up diagrams to see. I'm not sure in regards to the block itself, the primary differences are in the cylinder heads.

Here's a few differences I noted in the heads:
- Exhaust flanges are different
- There is no lost-motion spring or even the spot for it
- The rocker arrangement is completely different
-- 1 rocker arm per valve on the exhaust on J35Z3
-- 1 rocker arm per 2 valves on the intake on J35Z3
-- 1 rocker arm per valve on the exhaust on J35A8 (different design of the arm itself)
-- 3 rocker arms per 2 valves on the intake on J35A8
- The camshafts are different
-- J35Z3 has 2 intake lobes and 2 exhaust lobes
-- J35A8 has 3 intake lobes and 2 exhaust lobes
- The pistons are different
-- J35Z3 has a flat-top piston
-- J35A8 has a small dome on the piston

Compression is different in the engines, the J35A8 is 11:0:1 static compression and the J35Z3 is 10.0:1 static compression.

Since stroke and bore are the same (89mm bore x 93mm stroke) the difference in compression is likely from the different piston designs.

I'd be willing to take a guess that the combustion chamber probably cc's as the same value as a J35A8 cylinder head.

If you were to try to bolt a J35A8 head to a J35Z3 block it would probably bolt up and the passages may even be the same, however I don't know if the engine with the J35Z3 electronics for the VTEC engagement would properly operate the J35A8 VTEC arrangement. And I know the J35Z3 VTEC arrangement and rocker arms will not bolt to a J35A8 head (simple fact that the lost motion spring/housing would get in the way, likely among other things).
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Old October 12th, 2014, 02:20 AM   #3
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Always wanted to know this too, thanks for the detailed explanation!
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