Originally Posted by BurnOut

I think that's the LS4, though I could be wrong.

Originally Posted by Brian Tooley

Ooops, my bad, 400 @ .900", that's what happens when you try to go off of 40 year old memory.

.1 68
.2 139
.3 217
.4 282
.5 337
.6 358
.7 373
.8 385
.9 400

For those of you that pay attention to .500" flow numbers, 337 is STOUT for as little work as we have put in these heads. LS7 flow numbers coming soon, as long as, you know

Originally Posted by NOSjohn

I've heard the same thing...speculation is LS4. An LS3?

Originally Posted by AdioSS

The LS3 was probably the motor used in the concept orange GTO and blue Colorado that GM let out for the WoodWard Dream Cruise...

I know of at least one LS1 motor that could definitely use a set of LS7 heads that flow 400cfm@800-900 I also know of a company that would love to have a set of 5.3L heads that flow 330ish cfm...

Originally Posted by ChucksZ06

I can not wait until this stuff becomes available. Huge horsepower will be easier than ever. I get so sick of hearing about low rpm flow...what is your transmission for anyway? If you make sick hp from 4,000 to 7,000 who gives a rats rear end if you are down 50 ft lbs at lower rpms. Some good tuning will make the car nicely drivable at lower engine speeds. When I want to go I downshift and GO. A lot of this talk of low speed flow numbers comes from those who are stuck in the carburator era.

Originally Posted by JZ'sTA

A 2.20 valve is huge.
The heads were also flowed on a 4.125 bore, however I bet for stock castings they would still work nicely on a 4" bore with a 2.08 valve.

Originally Posted by 8KickassRS9

those were ls2's

Originally Posted by CamTom12

The question was about low-lift flow. Your valves are partially open for way longer then they are at peak-lift so those numbers are very important to making power. Doesn't have too much to do with engine speed

And these low-lift numbers are very stout

Originally Posted by dhdenney

Do we have some production dates on any of the latest LSx heads? I myself would like to do an LS project and am very curious about the LS7 heads and when they're gonna hit the shelves.