i have basicly a stock ls1, 241 heads milled .030, a .040 head gasket, and a comp cam part # 54-459-11,
lift .617/.624
113 lobe sep
231/239 duration

has anyone run this camshaft before, or does anyone know if the pistons need to be flycut?

 

If the shortblock is together then just check it yourself to be sure.
If it's apart then just have the flycutting done for safety's sake.

 

Probably so.

It'll be really close.

 

Should always be checked.

Rich