Looking into getting some heads from AFR, CNC machined and
ported for my BBC 454.

a little info on the engine. it's a complete High Output build from
GM performance parts, I obvisually want to lose the heads.
I'll need to find a good cam to go with the heads, which is my
next decision, I've been told compcams are great, so what do
you guys suggest?

4.00" bore, 8.5:1 compression, forged steel crankshaft and rods,
forged aluminum pistons, stock all stock, block is cast iron of
course. reccomended rpm is 5500, but I've been told not to
spin it past 6000, so I would say 5600-5800 is as high as
i'll spin it to.

anyways, i'm trying to decide between which AFR's to get, and
don't go off telling me so and so is better, I know i'm going
with AFR's, I don't want your opinion on what BRAND to
get, just which model of AFR heads..

now on to my selection.. going with CNC machined and ported
heads with the competition package.. I've decided to choose
between the two sets of heads which are in the largest portion
of my powerband 315cc and 335cc heads..

______________315cc_________335cc
PowerBand_____2500-6800_____3000-7000
Valves_Intake___2.250"________2.300"
Valves_Exhaust__1.880"________1.880"
C_Chamber_____121cc_________121cc
Intake_.500 lift__353cfm________352cfm
exhaust_.500 lift_271cfm________285cfm

flow is with a 2 1/8th inch exhaust pipe
my exhaust will be hookers with 1 7/8th inch primaries

you can check out the heads over at http://www.airflowresearch.com
under the bigblockchevy section.. for more details...

I'll be glad to recieved any feedback

 

4" bore for a 454?

Generally speaking, if you're keeping the RPMs down, keep the port volumes down to match. Your torque at lower RPM will appreciate it, although it's a bit less noticable with a longer stroke like that.

You could probably get away with closed chambers if you weanted a little more compression, but it's your build.