So, I bought a used 370 short block built by LME. I just brought it to a trusted machine shop to have it cheched out before I have everything installed. From what ive read, a 9.5 C.R. is desirable for a procharger build. The guy at the machine shop says its too high and should be around 8.5-9.0 He also told me I don't need total seal rings. moly is good.
I don't know what to do..... I don't want to change the pistons if I don't have to. Car is my DD on 93 oct.

Specs: 370
3.622 crank, 4.030 bore, weisco -2cc flat top pistons, callies rods.

Heads im using are 317's 73cc. I calculated 9.5 CR. for what I have.

 

9.5:1 is fine. I would like a little more but definatly no less.

 

For the street 9.5 is the lowest I would go. My new 383 is a 9.8:1... This is a street car only.

 

cool. How many pounds of boost r u gonna be running on this motor? Any meth?

 

Shooting for 10-12 #'s and I'm adding meth to the system this time around.

 

9.5 is lower than I would want but it's fine. You absolutely don't need to go lower at all.

 

OK Thanks. Thats what i figured..