What do the stock heads cfm flow at?
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Joined: May 2003
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From: Round Rock, TX
What do the stock heads cfm flow at?
What do the stock heads cfm flow at?
I found a nice set of heads for a decent price. These Heads Will Flow Over 200cfm At 0.300" Lift And 290+ At 0.500". The valve sizes are, 2.02 intake and 1.575 exhaust.
What are stock valve size? 2.00/1.55 and does it make much difference?
I found a nice set of heads for a decent price. These Heads Will Flow Over 200cfm At 0.300" Lift And 290+ At 0.500". The valve sizes are, 2.02 intake and 1.575 exhaust.
What are stock valve size? 2.00/1.55 and does it make much difference?
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Joined: Nov 2003
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From: kenner La
heads
Im not sure what the stock heads flow #s are but the the valve size is 194/150. You will not really notice much upping the valve size on the head. The real power is noticed with a good old port and polish with bigger valves. I tried 2.00/1.55 and was very disapointed. Nothing like pulling the heads twice! I did a home port and polish and the valves were done at the machine shop.
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From: Houston Tx
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Joined: Apr 2001
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From: Sac, CA
Intake.. Exhaust.. Lift
134...... 98........ 200
189...... 130....... 300
222...... 152....... 400
240...... 175....... 500
252...... 182....... 600
I got it from a very unereliable source ... was in a post I saw somwhere on the internet ... copied if for posterity
134...... 98........ 200
189...... 130....... 300
222...... 152....... 400
240...... 175....... 500
252...... 182....... 600
I got it from a very unereliable source ... was in a post I saw somwhere on the internet ... copied if for posterity
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Joined: May 2003
Posts: 229
From: Round Rock, TX
So i'm guessing the heads I like are good. 
Go here and scroll down a little more than half way a look and the heads that says LS1 - LS6 Street/Strip Cylinder Heads are the ones i'm liking. The Patriot Performance CNC Ported Cylinder Heads above don't look too bad either.
Go here and scroll down a little more than half way a look and the heads that says LS1 - LS6 Street/Strip Cylinder Heads are the ones i'm liking. The Patriot Performance CNC Ported Cylinder Heads above don't look too bad either.
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Joined: Jul 1998
Posts: 6,247
From: Charlotte,MI USA
Re: heads
Originally posted by pookie
Im not sure what the stock heads flow #s are but the the valve size is 194/150. You will not really notice much upping the valve size on the head. The real power is noticed with a good old port and polish with bigger valves. I tried 2.00/1.55 and was very disapointed. Nothing like pulling the heads twice! I did a home port and polish and the valves were done at the machine shop.
Im not sure what the stock heads flow #s are but the the valve size is 194/150. You will not really notice much upping the valve size on the head. The real power is noticed with a good old port and polish with bigger valves. I tried 2.00/1.55 and was very disapointed. Nothing like pulling the heads twice! I did a home port and polish and the valves were done at the machine shop.
LS1 5.7 stock heads have 2.00/1.55 valves.
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Joined: Apr 2001
Posts: 674
From: Sac, CA
Originally posted by 1KillerV6
so........is there much difference in the 2 heads I like in my 2nd to last reply
so........is there much difference in the 2 heads I like in my 2nd to last reply
Never heard of the one .. the patriots are getting a lot of play on the boards ... and some good numbers are being reported ...
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