Thanx for the responses

I am running the MSD Grid box & controller.

My current cam is a Crower solid roller:
Int 266*/ Exh 279*. @.050. Delivered lift at valve: Int..706"/ Exh. .692" 0 lash,.

Valve spring pressures :
installed @ 2.00" 240. On nose 570.

current piston valve @ 0 lash
Int. .081/ Exh..097"

here's the deal. This motor lays down flat after 6100 RPM. Confirmed on a chassis dyno. It's peak HP is 600 @ wheel 760 (calculated)@ flywheel.

The motor itself is a 12.7-1, 4.280 bore, & 4.25 stroke. Cylinder heads are ported iron street hemi.
Int. 398cfm @ .700" 402cfm @ .800"/
Exh. 288cfm @ .600" & flat lines with more lift.

Induction that was installed on the motor @ the time is a factory uncut mag. X Ram. with a couple reworked 4235 & 4236 holleys on top. They flow 897cfm each dry.

i fiqured this motor should pull well over 7,000 RPM & have somewhere between 825-850 hp.

I fiqured the intake was the "choke" on the motor so I've picked up a couple others. One is a heavily modified Mag. X Ram done by Dean Nicopolis from Ramchargers fame, The other is a old Hogan square port sheet metal X Ram.

I've heard Bullet has been putting out some good numbers on their profiles, so they were contacted. he says the original intake is fine, but the camshaft can be improved on.

with the above numbers I don't have alot of piston/valve clearance left here.

my spring pressures are low?


Is it really worth putting another cam in this thing?

What's your thoughts on intakes?

liteweight