Heads, how much gain?

IQ52 said
Here, let's try this. All stock intake flows from the same bench.......oops, added ported 452.

Lift...........RPM...........Stealth...........452...........ported 452

.100..........73..............66.................61.............90
.200.........146............142...............130............166
.300.........209............205...............188............218
.400.........254............240...............213............255
.500.........276............255...............227............278
.600.........287............267...............230............288
.700.........291............268................................294

Before you put any money into a stock head take a good look at this chart. /\ /\ /\

Can you make HP with a iron head. Yes. Is it easier with a aluminum head? Yes. Is it cheaper, safer with more benefits in the long run? Yes.

Keep in mind aside from the HP gains you'll yield from a better set of heads, you'll also gain performance from having a lighter head.

You'll also have a head that can be repaired, a head that is less prone to detonation, a head that costs less to have ported if you decide to do that down the road.