11:1 too high for pump gas?

And I quote..............."This is a street car and must absolutely run on pump gas."

Haven't you already answered your own question?

Oh heck, go ahead,

"Take it,"

"to the limit,"

"one more time!"

It's so much fun tearing them down to fix something you knew could be wrong in the first place.

"Aluminum heads need more compression." Is BS.