Funny how my mind works...

The NASCAR boys are using a lot of 0.866" pins to save weight. Consequently there are a lot of 1-race rods floating around with that weird pine size.

Today I was studying my KB catalog and came across the piston for a Toyota 22R. Bore is 3.622, available in oversizes. The piston weighs less than 400 grams and has a 0.866 pin. Compression height is something like 1.35"

Anyway I did the math and came up with an ideal rod length of 6.225". That's close enough to 6.200".

So it all fits in a 273 block and should rev easily, as long as you can find 6.200 rods with a 2.0 or similar crankpin size and pin of 0.866.

Anyone want to try? It's a 330.

R.