The “Racecar” came with a brand new matched set of four, flat tops except for slight valve cut outs stamping inside says 40f. Looks like this manufacture is now owned by JE Pistons.

I didn’t have a proper micrometer with me so I used one of the kinky plastic ones and it looked like they were 100 mm.

JE is what I used in my 2056 engine.

Thanks, they look very nicely made but I don’t have a very experienced eye.

They’re matched to the piston set, need to double check the engine case but I think everything was designed to work together.

Appreciate the response.

Keith Black