I know there are two sets of L98 heads that came from the factory and one is better than the rest. I was just wondering what makes the 083's any better than the 197's (i think it's 197 ). Thanx

 

Come on now fellas, 37 of you read this. At least one of you must know the answer!

 

the better l98's were on the vettes..they were aluminum..

im positive there are guys that know much more about it....but the aluminum vettes are much better

 

Well the Vette heads are aluminum(before mentioned) so they are lighter than the heads featured in the F-bodys since they are cast iron. I would also believe they might wear faster than the iron heads because they are made of a lighter less durable material. When I get my Camaro I am going to get a set of L98 heads(hopefully Vette) and then port and polish them.

 

yeah i agree the better head from the l98's were from the later corvettes. aluminum also..

 

there are also two different cast iron heads for the L98, one of then has ports that flow directly into the guide boss and then down the valve. The other set has an incline that brings the air around the guide boss and the swirls over the valves. I am not sure which is better, I think the swirl type came off the trucks. KI have the ones that go directly past the boss, but I have a set of the swirl type sitting in my garage.

 

That's what I was looking for! I'm looking for what the differences are in the iron heads. Casting #'s .....083 and .....187.