Unless I'm just completely wrong here the LS engines have the 4/7 firing order already switched by GM when they designed that engine, the LT engines do not, so us LT guys do custom 4/7 grinds. That issue was one of the first side by side comparisons of identical cams in the same identical engine (great article), other research I've done on it was just builders stating it's good for 10hp but little actual proof like a dyno sheet and (no other changes) being made to get a true benchmark. The gains for most on average are not necessarily a full 10 hp, some gains are as little as 2-4 hp. But it costs such a small amount to go ahead and do the swap.
Last edited by BRETTINATOR; 02-21-2006 at 12:36 AM.