Originally Posted by 68NovaSS
Doesn't seem reasonable to expect 650 out of a little 177 and 427 c.i., that's JMO>...
This 177 blower is fully capable of this power level on pump gas with healthy 10PSI boost.
2.33:1 drive ratio. Even on a SBC.
on a 427BBC w ported big valve oval ports its no sweat.
Low compression, 7.5:1 suitable street solid flat tappet or solid street roller cam.
248 to 255@.050" duration.
big carb. 2.33:1 drive.
A Comp XR286H-10 cam or a custom blower version of this cam ground on a 112-114LSA will get it done with the 177 on a 427BBC.
Lunati street roller cam #502A3LUN would be another example
Lunati flat tappet cam #402A4LUN will get it done very nicely on a budget.
A hyd cam or a hyd roller cam will really limit this motor.
lowering the compression is easy on this motor. Just replace the pistons with 427 forged flat tops.
Or get a 454 crank and use Common low cost forged L2377 454 flat top pistons.
Picking up 20cubes is a bonus.
this motor will easily make 650 hp with a 177 blower but I would get a Weiand 8-71 and two 750 edelbrocks for it on this motor. (+ the solid or solid roller blower cam)
( bet this motor has a lame hyd cam in it now and that is a big part of the current HP limitation problem.)
Cutting the dome of the present piston would be a big mistake.