vff_jeff

iTrader: (10)

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?

vff_jeff

iTrader: (10)

wow. No one?

Hemi2Slo

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?

SweetS10V8

iTrader: (4)

Airflow > compression (see sig)

vff_jeff

iTrader: (10)

6.0 or 364ci. Im still on the fence about this.

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.

Hemi2Slo

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.