I've built a 321 cid GMC (302+0.125" bore)in a HAMB dragster and turn it 6200 all the time. In fact the dragster is traction limited and the engine spends most of it's time on the rev limiter. The engine has stock 308 cid Hudson rods which are 1.25" longer than the GMC. I had a custom piston made by JE that weighs 500 grams. I saved about 1.25 POUNDS per cylinder with this combination!!!! I also run a SB Chevy Fluidamper (fits perfectly).
I had Dema Elgin grind the cam. It made 346 HP @ 5600 and 347 TQ @ 4500.
We ported the 302 head (#883 IIRC) and it flows 264 cfm @ 0.600
on the intake but only 144 cfm on the exhaust @ 0.400. All flow was @ 28". The head has 2.02/1.6 SB Chevy valves.
The dyno testing was done with zoomie headers which I've since replaced with a 1 3/4" 4x1 header. The TQ increase was unreal.
I also drive the distributor and BB Chrysler oil pump off the front of the engine. Works great. I'd attach pictures if I knew how.
Ron (goldenri@aol.com)
