momofx

Looking at head part no a motor that we have not much info on and I can't figure what heads these are. They are stamped R6830063 on the side and 821 up top.

Is this the head for a LSX 376

?

Che70velle

iTrader: (6)

Just type 0821 GM head into a search here, or you can google it, and find hours of info on what you have there. In a nutshell you have a rectangle port (square port) cylinder head found on several GM Gen4 engines, such as the L76, L92, LY6, just to name a few off the top of my head.