349cui build up

Hi Martin,

as far as i know cast pistons will get hurt when the piston speed is reaching some point, around 4300 feet per minute if i remember correctly. I calculated this with 4" stroke (i do have KB hypereutectic pistons = cast in my engine) and found that even with the longer stroke up to 6500 should be no problem, my limiter is set to 6400. So in your case, with shorter stroke, the cast pistons should be absolutely fine. For example, i know two 318 engines that use Nos, with careful tuning no problem with cast pistons, and these engines both see around 6500-7000 rpm at the track regularely.

I know.....the cool stuff is always expensive.....ask me how i know ;-)

Michael