E85 Street\Strip build??

Guitar Jones said
Well with a 4.03 bore, 4.0 stroke, 55cc chamber, .040 gasket and a 0 deck with about 6cc of valve relief you'll only get 13.0. You could stick that piston out of the block .010 or .011 and you'll get about 13.4.

Those RHS head chambers are about 62cc if I recall and they aren't aluminum either. I don't know how much you'd have to take off to get there. My small chamber W5s started at about 54cc, cut .050 off them to get it down to 47cc.

Thank you Mr. Jones. I didn't do the math but I thought that magnum chambers were 58cc to start. There's no way for me to know mathmatically what the chamber volume would be at a given deck without much more information. KB gives 5cc for that piston and I also did not check the bore on a .040" thick cometic gasket, which really makes a difference too. As I always say, a true measured comp ratio is the only way to know. On my 4.0L build the factory specs were 62cc but with only .007" off I measured it at 58cc with an Autolite 985 plug and stock valves with a nice 3 angle and the seat on the intake moved out to the outer 3rd (.050" from the face).

As you and I both know, it depends on the limit we want to take it and the ability to make it so. :read2: