[steve25]

Before you release any green out of your wallet for any Cam or lifter set up take an old lifter and confirm that none of your lifter bores allow the lifter to wobble more then a few thousands.

If need be buy a new lifter to confirm your bores.
A worn bore will not work with either a flat tappet lifter or a hydro roller lifter for very long!

If you have more then .0018” clearance with a new show up with a test using a new lifter then either go with a hydro roller Cam or get +.001” flat tappet lifters to use.

Keep in mind that .0018” side clearance on a round object in a bore means almost .006” of rock / wobble.

A lot of folks wonder why there oil pressure is on the low side and or they do not have much oil coming up out of the push rods and excess lifter to bore clearance is many times the root cause.


Here’s the stock flow numbers for those #96 castings taken @28”.

If you run a Cam of .500” lift and 225 intake duration @ .050” you should make 415 hp without a problem (as long as your compression is up to 9 to 1 )and even with the stock iron intake manifold.
You WILL need headers, if not then a duel pattern Cam should be used.


Intake flow .
.050”——-39.5
.100”——-75.8
.200”——-135.3
.300”——-177.5
.400”——-198.8
.450”——-203.7
.500”——-206
.550”——-208.4
.600”——-209.8
Exh flow
End port tested.

.100”——-50.2
.200”——-95
.300”——-128
.400”——-148.4
.450”——-152.9
.500”——-161
.550”——-163.7
.600”——-166.4
.650”——-168.2
Retest at .650” lift with exh tube.
—————184.6
The heads overall exh to intake ratio from .100” lift to .500” is 73.7%.

As long as you run headers you then do not need to run a duel pattern Cam, as this will help you to make a tad more cylinder pressure with less compression.
so keep that in mind when choosing a Cam.


If a bowl porting job is done then all of this ratio stuff will change.