A Little Perspective on Engine Size

[MiracleMax]

Originally posted by Unit 5302:
I'm not sure I'll be able to run the heads either. At 11.1:1 compression, they were best suited to leaded only, super premium gas when it was availible. Octane booster, and lead additive will need to be in the gas to avoid detonation I think.

Get hardened exhaust valve seats, the intake should be okay, unless the metal is SUPER soft, the A/F mix will keep the intake side reasonably cool minimizing valve ressesion. I had a set of brand X 461 castings worked on and had hardened exhasut valve seats pressed in, the motor has been run hot several times and so far no problem