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Discussion Starter · #1 ·
Hey all,
I have a late 73 240Z. If I don't put 91 octane(even in the oil capitol we don't have 93 octane) in my car it Runs like ****!! It diesels and sputters and in general runs like ****. I have a slightly odd head block combo and I was once told on this board that I have 9.5:1 compression. Could you people help me compute the CR??

Late 73 Block with the Domed Pistons(it makes up for the late 73 head that has the slightly larger chambers)
Early 72 head (has smaller Chambers)
Nissan gasket 1mm I think.
What else do Need??

What kind of Compression would I get If I put an e-31 or N-42-7 on my late 73 block??

Please help me!!

Dustin
 

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Discussion Starter · #3 ·
Hey,
Wait I do have domed pistons (they have a small hump on the center) because it makes up for the slightly larger camber size of a late 73 head. Not much of adome just about 4 cubic cc but it does raise the compression of that early E-88. check out the Texas Z site and they have all that head info you will see what I mean.

Dustin
 
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