[Stan Weiss]

Originally Posted by gobrdgo

I’m working on my 428 with a 455 crank and 96 head d port head engine. I’d like to achieve as close to 9.5 to 1 comp ratio as I can- given my understanding CA 91 will work without detonation. I plan on buying new pistons for the engine and custom is an option. Does anyone have experience with custom pistons that have a small dome in the spark plug side of the combustion chamber only? As in the small dome just enough to get the proper CC from the spark plug going away from the valves. Then I start to wonder if my efforts to unshroud the valves in the combustion chamber would be for negated with the dome? What do you think? I’m just a lineman not an engineer.

Originally Posted by gobrdgo

So my math is off. I need to re work that as I was coming up with like 9.37 to 1 with a .030 head gasket

Some one help me out here. What a I missing? Just what is going from 9.37:1 to 9.5:1 going to do? To cause the need $$$ for custom pistons.

Stan