So hey tommorow I pick up my 02 LQ4, well I have a guy wanting to sell me a rotating assembly from and ls3 with 5k miles on it that hes building into a 427.... ok so hes asking $250 shipped so im gonna take them off his hands, when i get them if everything checks out good ill have my lq4 block sonic tested and if able to be ill have it punched out to the required 4.060...then new rings, new bearing and ill have a cast iron block ls3 bottom end......i want to top it off with some ported l92 heads.. not sure on the cam yet looking to make around 450-500hp...sound good to everyone? any concerns? any random thoughts or sugestions? All are welcome....

 

Sounds like a good plan to me. I'm a little jealous actually lol.

So what exactly do the L92 heads come from? Are they just a GMPP item, or are they off of some car/truck like the GTO or something?

 

u can get them off the like 07 newer escaldes 6.2 l92...or u can get them from gm cheap...400 a piece assembled and they flow great, u have to use a l76 intake though cause the intake ports arnt as long and skinny as the older ls motors and u have to have at least a 4 inch bore cause of the valves here is a link to scroggins dickey...http://www.sdparts.com/product/12582...inderHead.aspx

 

The heads come on '07+ L92 Escalades & Denali GMC Trucks, '08+ LS3 corvettes, they also come on the '08+ G8 GT's LS2's.

ports are broader, and i beleive the shortside radius is better.

They require an L76, LS3 or a L92 Carb intake, and also require a special intake rocker.

 

A couple things to watch out for is that the LS3 might not use the same reluctor wheel as a regular ls1. Also, the L92 heads have a bad habit of snapping valves so the advised course is to replace them with all new valves.

 

Do you have a source for that comment about the valves?? The only problems that I'd heard of were with people who were trying to use hollow-stem valves with forced induction...