Vacuum Secondary Conversion

Newbomb Turk said
I’ll say it again. An aluminum head has no more detonation resistance than an iron head.

You can use pump gas and 12:1 compression but you have to relearn how to tune and set up the engine.

Never let anyone tell you how to do unorthodox compression ratios and pump gas when they have never done one. That’s number ONE.

Newcomb,
A lot of builders here, myself included, use tips off the hughes engine's website, which they gleaned from many decades of building engines. I am no engineer, but If you say that this information is no longer true or relevant, can you cite where you got the information, or is it your personal experience?