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Andy	11-21-2004 05:15 PM

compression, PSI

What should/would the compression of a 330 hp BB Chev be, with factory flat tops, std bore and Vortec L29 heads if everything was new? 160 psi or more? Has anyone cc'd these chambers, they look small maybe 105cc? Thanx, Andy...

mcollinstn

11-21-2004 09:45 PM

Re: compression, PSI

Older 330's were more like 125 psi.

HARRISONMIRAGE

11-21-2004 11:10 PM

Re: compression, PSI

They are small.I had a 454 that cold cranked at 180 psi.with a 224/230 cam installed at 106 atdc.Be carful with these heads on a carb motor as they will detonate really easy.Use about 28* total timming.As you bring the commpresion ratio up don't be conservative with the cam or you can get into a high cylinder pressure situation.These heads on trucks use a computer managment system to cool things down fast when detonation occurs.

mopower

11-22-2004 12:28 AM

Re: compression, PSI

I have a pair of 1989's with 700 hrs. that still pump 150 psi.

offthefront

11-22-2004 03:53 AM

Re: compression, PSI

Quote:

Originally Posted by mopower

I have a pair of 1989's with 700 hrs. that still pump 150 psi.

700 hours ...hmmm...would love to make it to 25 hours ...

mopower

11-22-2004 05:48 AM

Re: compression, PSI

Quote:

Originally Posted by offthefront

700 hours ...hmmm...would love to make it to 25 hours ...

Too many places "think" they're engine builders :(

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