How much HP from SBM ProComps? Well... 670HP!

Ok, so I have been using these ProComp SBM heads for about 1 1/2 years now. I think I got a pretty good handle on them. As with any head or part, they could use a bit of massaging to make them work real good. So here is our latest attempt. Im going out on a limb here and going to claim the MOST POWER MADE TO DATE WITH THESE HEADS, N/A NO FORCED INDUCTION, NO NOS!

This is a re-do from an engine we built last year. Customer wanted more power so we pushed it up a bit. here is the run down.

360 magnum R block
4.060 bore
3.825 stroke
6.250 rod
From the top down.........
1050 Dominator
Super Victor, ported in house
T&D roller rockers
Procomp heads, flowing 312/230
Custom Ractec flat top pistons 12.2 to 1
Custom Lunati roller cam, sorry no specs. I can tell you high 270's and mid .600's
MRL Pro PLUS soild roller lifters
3/8 pushrods
PEP I beam rods
HP bearings
Billet timing set w/tensioner
Mallory 32 series dist 34* total
Custom made wires Champion plugs
Kevko oil pan
Melling HV oil pump
Bla bla bla

Now for the fun stuff.

Torque, its whats for dinner. It peaked at 564TQ at 5400rpm. But it had 530 from 4600-6650. Hell at 7200 it still had 475TQ!!!!!

HP, its what kills the Chevys. Peak was 670HP 6550rpm. It made 600+ from 5600rpm on up. Still making 650HP at 7200rpm.

BSFC was .395-.459 the entire run and still had a A/F ratio of 11.3-11.9. I wanted to tune more but ran out of dyno time. Valve lash was best at .025I .026E. Ran a 2" tapered spacer fro the Dominator.

So there you have it 670HP with a 396ci SBM and those damn ProComp heads. BTW they are out of stock and will not have any until November.