Quote:
Originally Posted by steve25
If nobody speaks up then allow me to make a comparison that will be well in the ball park of what to expect.
Let’s look at a SBC and the common head port volumes that are run on built 350 and 383 cid motors, looking at this you find that in non race set ups the most common port volumes used are from 180 to 195CCs.
Note that a 350 SBC has a 3.48” stroke and the intake port is longer in lenght then our Pontiacs.
The Pontiac 350 ( actually 354 cid stock ) has a 3.750” stroke and near a 1/2” shorter intake port length.
What this means is that if we where to compare a SBC 180 CC port to a Pontiac 180 CC port then the Pontiac would have a larger minimum port area or choke point as some call it.
This is all well and good since the Pontiac has that longer stroke spoke of before as compared to a SBC.
The KRE heads are some 185 CCs out of the box, so a .030” 350 Pontiac at 360 cid could make good use of these heads if the motor was built to make peak hp at maybe 5800 to 6000 and hold together to be shifted at 6500 on the street, which can certainly be done these days with the parts we have!
Of course stroking the motor is a option also if the funds are there for it.
I have found that in stock form when tested on my flow bench that the KRE heads out of the box with there 2.11” valve pass 255 intake cfm
@28”
Fitted with a 2.02” valve you should have a solid 230 cfm at .550” lift which could churn out up to 430 to 450 hp depending on how hot of a street Cam you run!
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I know a guy that ran a S-10 truck with a 350, vortec heads, 170 cc. Small solid roller cam.10.80`s 1/4.
He wanted to go faster. So he wanted to buy the GMPP 200 cc runner heads. I told him not to. His truck. He buys em. Doesn`t change the cam, converter or gears. Truck runs mostly the same et, BUT, 60 ft. and 330 suffered. So, lesson to be taught to most.