Quote:
Originally Posted by Gach
He said what compression was in his first post, think thats what Steve is trying to tell you..LOL
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Quote:
Originally Posted by steve25
Stan, the op said he was only able to test out 4 of the cylinders for now, but found between 145 and 150.psi.
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Stan quoted me in his post asking for CR & cranking comp...
Quote:
Originally Posted by Stan Weiss
What is your CR and what do you see for cranking compression?
Stan
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Didnt want to sidetrack the OPs thread, just stating that I have a lot higher lift than his cam using the stock studs & crimp adjustable nuts with no issues for many years with lots of street use & drag strip runs. 7/16 studs are ideal but for lower-mild lift cams the stock studs work ok... using some cheap priced crimped nuts will let the OP see if that helps his issue, if it does then he can change the studs or keep them as is & it will likely be fine for a very long time.
I can only estimate my CR, used wallaces calculator at the beginning of the build and havent done a cracking compression test as I havent felt the need since the engine runs so good, but might do it at some point just for curiosity. Heres some specs of the build, pretty basic parts & machine work.
1978 W72 4 speed, 400 .30 over bore, 6x-4 heads no porting, 3 angle valve job, milled ~.030. speed pro forged pistons, stock rods/crank. felpro gaskets. stock intake, original cliff built q-jet. removed EGR & bypassed emission stuff. headers, 2.5" exhaust. XE268 cam installed "straight up" by me, along with the rest of the engine parts. short block assembly done at machine shop.
car starts & runs about perfect, no detonation, no hard starting when hot, no overheating on stock radiator, runs on 87 octane just fine, runs mid to upper 13's at 103+mph taking it easy on the launch to not hurt clutch, 5000-5500 shifts, not max effort runs, just fun at a test & tune.