Rocker Decision

A street car

yr asked
What are you using for valve gear?


your HE284H cam is here street-strip wants 3000 stall and gears

20-225-4 - Xtreme Energy™ Hydraulic Flat Tappet Camshafts

shows intake close at 68ABDC

.507 lift



XE285HL is here

20-228-4 - Xtreme Hi-lift Hydraulic Flat Tappet Camshafts

shows intake close about the same 69ABDC but 545 lift also 3000 stall

I've run those iron rockers with 550 lift

will work fine with a dual plane also and better for street and a real 9.5 cr



XE274HL is here

20-227-4 - Xtreme Hi-lift Hydraulic Flat Tappet Camshafts

.525 lift so should even be okier

but it closes the intake at 64ABDC instead of your cam at 68ABCD



you want a street build

4 degrees makes a big difference and the extra lift should give you the same top end and more bottom end and mid range

only takes 9:1 or better and does not require 3000 stall



why leave performance on the table

heck comp still sells the even older 280H take a pass on it and the



IMHO THE TOP TWO CAMS ARE MORE STREET-STRIP THAN STREET

not knowing your build details from this thread are they posted elsewhere?