Quick little question here, is it more worth it to buy LS3 heads over the L92s even if I am going to switch out the valve springs? The difference in price is about $240. Just wondering what you guys think.
https://paceperformance.com/i-708813...-assembly.html L92s
https://www.lsxceleration.com/chevro...mbly-12675871/ LS3s

 

GMPP has the LS3 CNC ported heads.....

 

So bump to $450 price difference but I am unsure of the bump in compression. What would that turn out to be on say a stock LS3, you CNC the heads compression then equals ?????

It may be worth the extra $450 I just wanted to hear yall’s thoughts first

 

What engine are you putting them on?

I think the only real difference is what the valves are made of, but someone who knows more will have to confirm that.

IMO the GMPP LS3 heads are the best bang for the buck, stock casting, head you can get.

 

I agree, and if my 408 does need to come out of the C5 again... its getting CNC heads

 

Just wondering…..

 

They are basically the same chamber size, 68.4 vs 68.5 so no compression change (change in head gasket thickness or milling heads = compression change). The CNC is the porting of intake/exhaust runners thus allowing more air in/out of the head. More air in/out generally helps in the power category.

 

D'oh I'm mega brain dead. I did not mean compression I meant flow

 

LS3 has sodium filled intake valve (a little lighter)

L92 has solid intake valve

 

Don't mean to sound ignorant but what would be the purpose of that? I'm assuming it is a performance thing but is it something else?