Magnum Heads

goldmember said

You sure the lower threads are 7/16"? looks like 3/8" from here. There are studs 7/16"-3/8" BBC that work well in this combo. I've done that conversion for 20 yrs. God the PR pinch looks like crap.lol I have a set in the shop now that look the same,but not when they leave. Looks fine go have some fun.

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I had them opened up to 7/16ths, and I'm using Chevy 1.6 roller rockers. The seat pressure is 128lbs so the 7/16 studs aren't really needed. But I can go with bigger springs if I have to and not have to worry. The next step is to mock them up and measure the pushrods. I hear you on the pinch at the intake. We talked about that at the shop. Since this isn't for all out racing I wanted to keep the velocity high, the motor should be a torque monster.