Who modded this motor?
#2
Powerhouse likes to scallop the sleeve like that. Others do too though so who knows.
#3
A lot of time the person who does the mod will put there name on the block. Anything on there ?
#6
that is a Powerhouse !
#10
That can happen even on a stock one. I had several onroad Nova motors do it while running a certain VERY popular fuel. I used to love the stuff but after that I switched and have not had it happen since.