Lets compare heads
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 3,333
Likes: 0
From: Athens OH
Lets compare heads
Basically, I am wondering if it is worth the extra cash for the added compression of the 5.3 heads and what differences I may see between these heads. They will go with my Torquer v2 cam(232/234, .595"/.598 112LSA
TSP's PRC 5.3 stage 2.5
.300 208
.400 257
.500 290
.600 312
The other set, I don;t know a lot about.
Ported LS1 heads
.500 300
oversize valves
5 angle valve job
Thanks!
TSP's PRC 5.3 stage 2.5
.300 208
.400 257
.500 290
.600 312
The other set, I don;t know a lot about.
Ported LS1 heads
.500 300
oversize valves
5 angle valve job
Thanks!
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
It's kind of tough to really compare the heads with so little data. Flow #'s at all RPM's for the LS1 heads are needed. Are the LS1 Heads milled? How does the exhaust flow on both heads? It would be nice to know approximate intake port volume as well. With the info provided the PRC's would be the better bet because they are a known quantity. More data could change things.
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 3,333
Likes: 0
From: Athens OH
It's kind of tough to really compare the heads with so little data. Flow #'s at all RPM's for the LS1 heads are needed. Are the LS1 Heads milled? How does the exhaust flow on both heads? It would be nice to know approximate intake port volume as well. With the info provided the PRC's would be the better bet because they are a known quantity. More data could change things.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
One thing to consider, is that adding compression will not only help your torque, it'll improve your fuel mileage. As long as you can get 92 or better OCT. , don't be afraid of bumping the CR to between 10.9-1, to 11.6-1. Makes throttle response crisper, too.
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 3,333
Likes: 0
From: Athens OH
Am I right that larger runners will make power at higher RPMs? I am looking for moire low to mid range torque.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Generally, smaller ports will increase port velocity, thus low-end response. This underlines the need to match cam to heads, and your driving habits as well. I kind of splurged on heads, because the Trickflows looked like they have so much potential, but then I went with a smaller cam to maximize mid-range. I don't drag race, so I figured this is the area I'd get the most fun out of my combo. One of the best performing aftermarket designs has for a long time been AFRs, and their ports are only 205cc, versus 215 of the TF, and 220 of stock LS1 (I think).
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Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
I made 450 w/ 5.3 heads and a 230-236 112 cam and all bolt ons and drove that motor in bumper to bumper traffic with no downside with a speed density tune.
Last edited by WKMCD; Jun 22, 2007 at 09:39 PM.
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 3,333
Likes: 0
From: Athens OH