Piston to head clearancing

[Ol' Ron]

The rules for sportsman engines back in the late 50's was 1/8 overbore max, stock 3 3/4 crank. ahy cam stock valves, heads and intake..
In an effort to get max acceleration off the corners. WE ran the 38/42 crank, 21A rods and Silverlight pistons. The rich guys tried Thomas mag pistons. I had a set for yhe 4" crank. but they never became league.. Light rear drums and anything else that spun around. This is when we discovered rod stretch.
We also ran alum clutch and flywheels. Cheating was the name of the game, but getting caught could loose your number. The best mod was a hollowed out 33/34 intake and 2GC carb. Now on a short track, non of this was very importan,FI, You didn't have the ***** to use it,

[36coupe]

Originally Posted by Ol' Ron

The rules for sportsman engines back in the late 50's was 1/8 overbore max, stock 3 3/4 crank. ahy cam stock valves, heads and intake..
In an effort to get max acceleration off the corners. WE ran the 38/42 crank, 21A rods and Silverlight pistons. The rich guys tried Thomas mag pistons. I had a set for yhe 4" crank. but they never became league.. Light rear drums and anything else that spun around. This is when we discovered rod stretch.
We also ran alum clutch and flywheels. Cheating was the name of the game, but getting caught could loose your number. The best mod was a hollowed out 33/34 intake and 2GC carb. Now on a short track, non of this was very importan,FI, You didn't have the ***** to use it,

Ron,
Why did you use a 33-34 intake and anything special about the carb? Would these modifications be useful today?

[Ol' Ron]

The 33/34 "Camel back" Intake is a large casting, and can be hollowed out, The Bore can be increased to the size of the 2GC carb the carb can have a third bolt added where the PB port is filled with JB weld Noe it's a legule carb because it in the original place. The inside of the intake is formed with epoxy and fiber glass Then filled with foam to shape the runners. After the Epoxy hardens just pore some gas into the intake and lall the foam will melt away. I still have one of the last intakes I made. I;ll take some pics and try and post them. This was one mod that really worked quite well. It's nice when something work better than planned.