What Pontiac did you buy, and what is the LS4 engine, in non-GM people's terms? V8? V6? OHV/OHC/DOHC?
"What Pontiac did you buy, and what is the LS4 engine, in non-GM people's terms? V8? V6? OHV/OHC/DOHC?"
A Grand Prix. The LS4 is a 303HP 325 cid V8. It has displacement on demand so that at highway speeds it operates as a V4 for some, but not significant, fuel savings.