I was planning to use a miniram or lt1 on a 383. Which heads would flow better or make more power, I would be running at high rpms like 6500.

 

The AFR are far superior and i thin are about the same price. The fastburns are pretty much just aluminum vortecs. They are good but not that good.

 

Why not Pro Lightnings?

 

Between the two heads questioned, the AFR's.

Mark has raised an excellent question though......

 

From what i understand the AFRs, but i will be using the fastburns b/c thats what came with the motor! I am also using the miniram. They are basically aluminum vortecs but from what i have heard they have great potential when worked. I did not have any work done to them. They are on the crate motor. Out of the box the AFRs from what people say! good luck

 

I think saying the Fastburns and the Vortecs are pretty much the same is like saying a Cavalier is pretty much a Camaro.

 

Here is the flow ratings of the two heads from purplesagetradingpost.com/sumner/techinfo/heads1.html

lift GM Fastburns GM Vortec

.100 62/55 70/49
.200 136/104 139/105
.300 187/133 190/137
.400 232/158 227/151
.500 266/180 239/160
.600 275/193 229/162