Thread: SBC Cylinder Head Info Request

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60cc chambers are going to build a lot of compression, so deep dished pistons are going to be required. 9.5 to 1 is going to be the absolute max that I would run with iron heads and I would probably shoot for less if you don't want to run 93 octane all the time.

The valve sizes are pretty small for a 350 in anything other than a truck that needs a lot of low end torque. They are going to be flow limited on a 350 and will probably run out of capacity around 4000 rpm (even quicker on a 383), so there's no need to run a big cam. It would be a waste.

If all you want is a very low performance engine that requires high octane gas just to move the car from point a to point b then they will work, but I would ditch them and get something better.

Always figure out what you want the engine to do before you buy anything no matter how "good" the deal. You would be better off with one of the cheaper GM crate motors than anything you could build with those heads. The $2000 L31 Vortec engine will easily make over 300 HP(probably closer to 350) and run for 100,000+ miles with no issues. Comes with a roller cam, so no cam/lifter issues. You could beat that price with junk yard parts, but if any real machine work is needed, you won't. Something to think about. Summit and Jegs sell these engines with free shipping all the time.