[AnthonyG]

Ol’ Ron & Fordestes- As Bored & Stroked said, Builder believes detonation is what caused. From another thread I posted when I removed heads, Offy. alum. & discovered from many who posted there’s an issue with the head design regarding s. plug reach. Short story no plugs made in correct heat correct length. My builder put 437 reach Autolites which were .250” short & not entering the fire chamber causing detonation which cracked land between rings on 4 cast pistons. New pistons r Ross Forged. Offy Heads counter sunk @ 120degree to flush thread condition on plugs as recommended.
Kurt & Ronnieadvice if cyl’s not damaged don’t hone have me wondering now if I should or shouldn’t hone? W only 2000 miles on engine when this happened it still has original honing pattern showing?