Ls6 Heads
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From: CABOT
Ls6 Heads HOW MUCH RWHP WILL STOCK LS6 HEADS STAMPED 243 GIVE YOU OVER LS1 HEADS #241. ENGINE IS STOCK LOWER END HAS A 600 LIFT 231 DURATION CAM, HEADERS, TRU DUALS, COLD AIR KIT. 
Last edited by BILL BOB; Dec 8, 2004 at 04:56 PM.
Originally Posted by BILL BOB
HOW MUCH RWHP WILL STOCK LS6 HEADS STAMPED 243 GIVE YOU OVER LS1 HEADS #241?
TECH Fanatic
Joined: Sep 2003
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From: San Diego, CA
HOW MUCH RWHP WILL STOCK LS6 HEADS STAMPED 243 GIVE YOU OVER LS1 HEADS #241. ENGINE IS STOCK LOWER END HAS A 600 LIFT 231 DURATION CAM, HEADERS, TRU DUALS, COLD AIR KIT.
id guess with what you have listed......
ls1 heads 370rwhp
ported ls1 heads 390rwhp
ls6 heads 400rwhp
ported ls6 420rwhp
just a guess.....
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Joined: Mar 2004
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From: BFE
LS6 heads with no cam change on an LS1 will give you around 20 rwhp.
1- They are 0.5 bump in CR
2- They flow around 15cfm more
Add a 231/600 lift cam for another 30rwhp
so I would say ~ 40-50rwhp
1- They are 0.5 bump in CR
2- They flow around 15cfm more
Add a 231/600 lift cam for another 30rwhp
so I would say ~ 40-50rwhp
Thanks, Predator. That is about what I figured/guessed also. I saw one post that said 20 to 30 at rear wheels would be pushing it. I would be mighty disappointed/mad 
if after all that work and money I only got 20 or 30 more. What he needs to keep in mind here is that the power is the sum of all cylinders together. What I mean is, 20 to 30 at the rear is easily doable with a cam only. Like you pointed out, people forget that the LS6 heads not only flow better, but bump compression also. Breaking down the power increase by cylinder, a 20 horse gain/8 (total cylinders)= what, a 2.5 horse gain per cylinder? A very low estimate IMO, not a pushing it figure. With the cam and heads he is talking, a 5-6 horse gain per cylinder would be very much an "in the ballpark" figure. 
if after all that work and money I only got 20 or 30 more. What he needs to keep in mind here is that the power is the sum of all cylinders together. What I mean is, 20 to 30 at the rear is easily doable with a cam only. Like you pointed out, people forget that the LS6 heads not only flow better, but bump compression also. Breaking down the power increase by cylinder, a 20 horse gain/8 (total cylinders)= what, a 2.5 horse gain per cylinder? A very low estimate IMO, not a pushing it figure. With the cam and heads he is talking, a 5-6 horse gain per cylinder would be very much an "in the ballpark" figure. TECH Fanatic
Joined: Sep 2003
Posts: 1,570
Likes: 1
From: San Diego, CA
ls1 heads 370rwhp
ported ls1 heads 390rwhp
ls6 heads 400rwhp
ported ls6 420rwhp
ported ls1 heads 390rwhp
ls6 heads 400rwhp
ported ls6 420rwhp
are graphs are very similar exept i make a little more torque down low.....
looks like you reved it to like 6800!!! wow... that cam must really scream!
