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?