Where does the LS engine get it's efficiency from?

[68GMCCustom]

btw.....anyone seen the new Arias hemi LSX heads?



arias_flyer_LS%20Hemi.pdf

[Super73]

Those things have got to weigh 3x as much as a conventional LS head and cost stupid money if I am correct. Not saying they aren't good heads, but I haven't seen any results yet.

[68GMCCustom]

I think you have to have a LSX style block that supports the 6 bolt heads. I also think they're building it with a sheet metal intake, blower carb and huge 106mm (or so) turbo....for something like 2000hp?

[swb85]

Those arias heads are cool, but they are stupid expensive. The canted valve stuff that's become available lately performs as well or better and is a fraction of the cost.....

[C-10 simplex]

1) Speaking on a related subject to the arias heads, the other thing that blows me away is that the lsx block can take 1500+Hp per gm and maybe 2000HP or more for only $2000! i've been a fan of the original chevy small block since i've known about them, but the more i read about the ls i would have to say it is superior to the small block.
Even the stock ls blocks can take a good amount of power.

2) Back to the subject of efficiency and forged parts: Would using forged rotating parts---crank, rods pistons have any effect on durability/longevity for a daily driven street (and occasional strip) engine?

[5150.4.67]

Back to the subject of efficiency and forged parts: Would using forged rotating parts---crank, rods pistons have any effect on durability/longevity for a daily driven street (and occasional strip) engine?

I think it all matters just how much stress you are going to put it under. Forced induction or spray? No question forged, at least the pistons.
A street mill can get away with stock crank, rods and pistons. They are all impressive for being production pieces. Texas Speed runs a Camaro with a stock bottom end and turns high 9"s!!!!!
The beauty of hypereutectic pistons is that they don't increase much in size with heat (to a point), allowing you to run tighter clearances. The downfall, you push them to the limit and they hand-grenade, unlike forged.
My $.02