Ed, as long as you have your computing hat on, how would this fit:
I have generation 1 Dart Heads, been decked (looks as if one got slammed by a piston some time in the past), been ported, 58cc chambers, 220 runners, 208 int., 160 exh.
6" Manley rods, Ross 9cc dome w/1.196 compression height. Block is 400 SBC, decked for cleanup only. Callies int crank w/3.625 stroke.
Comp Cam 12-940-9 circle track, Gross valve lift 0.645 0.63, duration @ 0.02 Tappet lift 290 300, Valve timing @ 0.05 Int 24open 56closed, exh 58open 26closed, lobe lift 0.43 0.42, lobe sep 106. 943-16 valve springs @551 lbs operating. Topped with Super Victor port matched, Holley 850 double.
I'm coming up with 640 HP with 635 torque 4500-7500 rpm. But not sure about the valve clearance.