My 51027 Diamond pistons were advertised in the 11.1 area at zero deck (flat-tops) and like I said I wasn't at zero deck. Plus i always open up my chambers some to help flow. That engine ran 10.0's with BP93 pump gas. Then I wanted to play with a set of Econo W2 heads I had sitting here so I threw one on my flowbench and it maxed out at
[email protected] lift and then fell on its face. I didn't spend a lot of time porting it and stopped at 305@600 concentrating on low lift numbers because I only had a 520 lift Racer Brown cam in it. Being that engine had a cast iron head I ran 4 gallons of 93BP and one gallon of 110 race fuel for safety and it ran 9.80's. Now I run alcohol so I will be stepping up compression on my future builds with strictly aluminum heads.
