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Discussion Starter #1
Im doin a major rebuild and tranny swap in my 3rd gen Si!

I have 2 blocks... JDM "b20" and a USDM B20A5.

Does anyone have specs on the JDM B20 block??! Having probs finding bore size etc.. becuase i want to upgrade the pistons to oversize etc.

Anyone know the horsepower specs or if the JDM B20 has bigger pistons than the B20A5??

Thanks!

Sanj
 

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as far as the block itsself goes, im pretty sure they are identical. the pistons are different between the two (as far as height, aka compression), and the heads are also different between the two. higher compression on the b20a...
 

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Discussion Starter #3
YOu think the b20 has bigger pistons than the b20a5? and better compression... the hi end on it seemed better

Thinkin about puttin the b20a5 head on the b20 block.. along with machining etc.. oversized pistons etc.. dc header, skunk2 cam gears
 

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b20a5 and b20a have the same bore, aka piston diameter. but the tops of the pistons are different, which is part of why the b20a has higher compression.
 

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Discussion Starter #5
Its strange tho.. this other motor i have has a stamping of "B20" and nothing after it.. no letters or numbers??
any info on this motor?
 
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