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Old 05-29-2014, 02:27 AM   #1
Scooby Newbie
Member#: 361498
Join Date: Jul 2013
Default Frankenstein phase 1/2 compression ratio ?

So, I've been having trouble sourcing a decent engine block to replace my blown EJ25D in my 99 leggy. I wanted to use a phase II block from a newer legacy or something, but just can't find one. Local machine shop wants too much to machine and rebuild the engine, and JDM engine corp or similar want too much for a used ej25d with 30-60k miles (probably).

So, I figured why not get a new ej257 shortblock for for equal or less than what they want and put high compression pistons in it, and use it with my phase 1 heads, I/M, etc. as a n/a motor. The EJ compression matrix that's been circulated is wrong, but I'd need to know what ratio pistons (pretend for 257 heads) and which headgasket to use to achieve around 9.7:1 compression with the phase 2 block and the 97-99 phase 1 ej25d heads.
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