is it just that the LO8 is Tbi and the LG4 is carb and pont and maro? thnks

 

THe L03 and LG4 are both 305s, and both are the bottom model V8 in their respective years. They have the same cam. Heads are different: L03 ones are terrible and hopeless, LG4 ones while terrible in stock form are at least workable.

 

The LO8 is a 5.7 TBI that was used in Caprice Classics and other full size GM models.

 

Ok thnks And I meant LO3 oops so is it worth it to put my LG4 heads on it? thnks Kev

 

LG4 heads are ALOT better than L03 heads


Lo3 heads are garbage, while LG4 heads are very close to L98 heads flow-wise

 

You will get vastly better results if you fix the other bottlencks of the L03: the exhaust, all the way from teh heads to the street; and the "peanut" cam; and do a mild porting job (bowl cleanup above all else) to the heads.

For exhaust, get a chassis-specific system for one of these cars, but not for the L03; I'd suggest looking up the one for a 88 350 TPI. You'll need the headers with their Y-pipe, a high-flow cat, and a cat-back exhaust, none of which will be compatible with any of the L03 stuff that's there now. Every piece of that needs to go in the trash.

 

cool thnks I have the headers and y pipe on order already I already have a flomaster cat back. I dont know what cam yet. The bottom end of the motor was redone 15,000mi ago. new crank rods and pistons. the top end has 124000mi on it but they dont matter anyway since Ill out the LG4 heads on the have 40000 on them. and itll be carbed by the rochester or an edelbrock 750 thnks

 

does anyone have a cam to recommend for this set? thnks

 

i wouldnt ditch the TBI less you planned on going to very high hp levels, ultimate tbi mods, and a new tbi intake help your tbi motor run alot better, and with those heads and exhaust, even better

 

grab an LT1 cam, they really wake the LO3 up.

 

OK thnks guys I will be getting it all done soon

 

I guess everyone thinks that is the best option for me with that motor? my Z28 is carbed. and I dont care about smog equip or anything. thnks Kev.