ls6 vs ls7 heads?

[crashz28]

any physical differences other than flow numbers and which one is better.

[Goatman]

The LS7 heads use a different rocker set up than the LS-x motors. Can't remember weather its the intake or exhaust side that's different. Of course, the intakes are different as well.

And then there's the price.......

[crashz28]

hmmm well here is my setup.
427ci ls1
10.5 to 1
620/630 @ 116 solid roller turbo cam
it will be spinning a 100mm turbo
should i go aftermarket such as dart or afr of run the ls7

[Goatman]

I would. The aftermarket stuff is better than the factory stuff anyway.


10.5:1 and a turbo, huh? You and your engine builder will be very, very good friends...

[WS6]

I would go aftermarket as they will be stronger. RHS has a thicker deck surface on their heads and I believe AFR does too. I sure hope you're running only a small amount of compression or race gas.

[Goatman]

Even with race gas, with that turbo, it's way too much compression. That's a serious turbo.

[baz67]

hmmm well here is my setup.
427ci ls1
10.5 to 1
620/630 @ 116 solid roller turbo cam
it will be spinning a 100mm turbo
should i go aftermarket such as dart or afr of run the ls7

I'll bite. How did you get 427 out of a LS1?

[andrewb70]

I'll bite. How did you get 427 out of a LS1?

Sleeved block.

Andrew

[craig]

talking about flow numbers on aftermarket ls1 or ls6 heads. even some of the best aftermarket cathedral port heads dont flow like a stock ls7 head. the l92 head right out of box out flows afrs best ls1 ls6 head.

[WS6]

while true, there is a lot more to heads than advertised flow numbers.

[Karch]

while true, there is a lot more to heads than advertised flow numbers.

Absolutely

www.proheads.com

[craig]

check out this months gm high tech mag. 2 good articles on l92 heads

[maven]

The LS6 head is almost no comparison to the LS7 head, the LS7 has larger valves,larger ports, larger runners, and a 12 degree valve angle as opposed to the 15 degree in the LS6, not to mention the LS7 is CNC machined and the LS6 is as cast, the L92 head is (basically) and as cast LS7 head.

The one downfall of the LS7 is that it doesnt like to be installed on the 3.90 and smaller bore blocks were as the LS6 is designed for them, you also need the unique valvetrain components for the LS7 if you want to use it(these arent that expensive)