Aluminum heads

YR, I don't believe your 11.1 engine will maintain 160 degrees on a 100 degree day with 4.56 gears. I'm sorry I don't buy it.
and it wouldn't do it with an aluminum head either. compression creates heat.
I do believe you are able to run 11.1 on pump gas without detonating, but you would not with a 1-1.5 compression increase even with an aluminum head.
The heat has increased in the combustion chamber with the added compression. lol