Head choice and opinions needed.
Head choice and opinions needed. I have a Lq4/th400 stalled that I originally set up for boost.
it has ARP studs, rod bolts ect. Medium cam, turbo gapped rings, UD pulley ect.
Right now I have ported, polished 317 heads with chamber work, and milled .010.
I cant go turbo for a while, And I have a set of 706 truck heads also. But they are stock. Which ones should I run for best performance? I will be running stock manifolds, and have it SD tuned. 3.42 gears on a 30'' tire. In a 4k# truck.
I know My ported heads flow way way better, but would the small combustion chamber yield better performance?
it has ARP studs, rod bolts ect. Medium cam, turbo gapped rings, UD pulley ect.
Right now I have ported, polished 317 heads with chamber work, and milled .010.
I cant go turbo for a while, And I have a set of 706 truck heads also. But they are stock. Which ones should I run for best performance? I will be running stock manifolds, and have it SD tuned. 3.42 gears on a 30'' tire. In a 4k# truck.
I know My ported heads flow way way better, but would the small combustion chamber yield better performance?
12 Second Club
Joined: Dec 2008
Posts: 281
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From: A small town, MS
The smaller combustion chamber would give a higher compression ratio, but since the truck heads are stock the compression gain may be outweighed by the loss of flow. What cubic inch are you running?
So you think heads that flow 300/.600 lift but at a 9.5CR is better then heads that flow 226/.600 lift but have a 11.0CR? How much of a difference do you think there will be? Keep it coming guys. I want everyone's 2 cents.
12 Second Club
Joined: Dec 2008
Posts: 281
Likes: 0
From: A small town, MS
With either of those cubic inch sizes the better head flow would do the most good. The low compression will hurt you a bit but the solution would be to have them milled a little farther, say to about .03 or .04. That would pick up your compression. Just be sure and get them angle milled, not flat cut.
