Thread: 383 Chevy

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I am planning on purchasing some Dart Iron Eagle Platinum Heads with 215 runners, 64 chambers and 2.05/1.50 valve size. I plan to use these heads on a 1957 Chevy Truck for street use that I want to run on pump gas. The actual motor is a 350 four bolt main that will be machined into a 383. So far I have an Eagle forged 4340 crankshaft and H beam 5.75 connecting rods that will be hooked up to a 400 TCI Super Street Fighter Transmission. My question to all you gear heads is what kind of forged pistons, cam, lifters, and rockers will I need or are these heads too big? I do plan on keeping with my original plans of using cast iron heads.

The heads are too big. You'll really have to crank it to make power. If you really have to crank it, that takes a long cam. If you have to use a long cam, that means higher compression. If you have higher compression, that means special fuel, especially with iron heads.

Look through the link I've given you to dyno's combinations. These are all street motors. Look at the compression ratios. Look at the rpm where they make maximum torque and then look at the intake runner volumes. Combo 10 uses Dart heads and I'll bet if you called Dart and asked them what the volume of those heads was, you'd find out they were 180's.