the 434 heads stink. You cannot get high horsepower from a small motor at low rpm.
If you want tlow rpm get a diesel or a 454.
live a little rev it up. you want to agressively port the head. but not polish . and don;t bother starting with a #434 head.
Find a 4416 or a 601 or a vortec head. Or a 081 or 083 head. The 450 and 434 low perf 305 heads suck.
start with the HO heads and port the crap out of them.
You need flow to make HP. and RPM.
When you port a stock head for power you need to make serious dent in it.
YOU NEED FLOW. You will not get flow by *****ing around with a dremmel and sanding rolls.
This is not a low rpm motor,,, cam, especially in a 305.
when you cam up a motor you need to rev it up.
when you hot rod a 305 you need to rev it up. In a 305, this cam does not get real busy till 3000 rpm.
it wants to rev.
Hot Rodded small motors want to rev ...
You cannot increase the low rpm torque output by adding cam to it. especially on a 305.
Find some 4.10's
Last edited by F-BIRD'88; 02-12-2013 at 11:44 AM.