does anyone have any info on trw L2293 ,they are .030 over bore,ie comp ratio,ring groove sizes

along with trw piston ? i have a cam with only cwo and #894440 markings on it ,any guesses to cam brand

I think them piston are 383 .030 over 12.5-1 with close chamber heads..No idea on cam

They are .060 - 12.5 with 78cc heads. You can use a cam with about .550 lift with no fly cutting with big valves. They make compression but keep an eye on the extended spark plugs! They are for a 383. I have used them since the 70`s and they are a old design. If you decide to not use them, hollar at me.

Those are 383 pistons which have 1/16,1/16,3,16 ring grooves.
They are 12.5-1 with a 78cc head.
Old school,heavy,powerforged pistons.
I run them with a full floating pin,non-bushed.
If you want to run a more modern designed,lighter choice,let me know. I'll buy 'em from ya.
John