Wet 1

iTrader: (4)

WP guys, I understand your heads will be fitted with SS valves (2.200" I/ 1.625" E). Will the factory GM LS7 valves fit your heads for those who are looking for a lighter weight option? Obviously the GM LS7 exhaust valves will not fit since they are a smaller diameter (I believe, please correct me if I'm wrong), but will the 2.200" GM Ti valves (with the GM lash caps) be a direct fit?

Looking forward to hearing more about your heads. Thanks guys.

Dune-LS1

Isn't the GM LS7 valve stem metric? If so, they won't work in the LS7X head.

Wet 1

iTrader: (4)

That was my assumption as well, but I thought I'd ask before I go nuts exploring other light weight intake valve possibilities.

DavidNJ

You can change the guides (about $80) and use any stem you want. What about using 7mm stems?

Warhawk 1

Guys,
Once we determined to change directions and not use the gm valves, I basically put them out of my mind. As far as being a direct swap I would say no. The 8mm valve stem is .31496", we are using 5/16" valves which are .3125". It doesn't seem like very much of a difference... until you try to run it. We have customers who currently spin their sbc motors up to 7500 rpm. We don't think that the valves we use are limiting or handicapping.
B

Wet 1

iTrader: (4)

Thanks for verifying that B!

I talked with a gentleman from Manley earlier today while inquiring about Ti valves (I also assumed the GM valves wound not fit). He suggested that I'd probably be fine with the SS valves spun to 7k (as you've stated).

Another thing he mentioned which I found interesting, was that he strongly suggested I use the Super Duty Series valves rather than the Race Series as he didn't feel the Race Series are rated for the high temps which are created when used with FI. He said the Race Series were only rated to 1225*F were the Super Duty series were rated to 1375*F. He said the Race Series valves would be over taxed if used with FI, which I'm using as you know. Since the price between the two is minimal, can I assume WP will be spec'ing the SD valves? If not, will this be a low cost option through you guys?

As always, thanks for your time B!!!

Also, check your PM's.

DavidNJ

Was the 7500rpm with a solid flat tappet or hydraulic roller. A 2.20" SS valve will be a heavy piece, over 120gms with even a 5/16" stem. The LS7 Ti and 2.0 LS1/2/6 valves are under 100gms, and use lightweight beehive springs and retainers.

Typical uses of a 2.20" valve are big block engines, Clevelands, and SB2s. There valves are typically either made of titanium or have 11/32" or even 3/8" stems. A 5/16" stem on that large a valve could have maintenance issues. I think they are commonly used like 7mm on small blocks, where replace during maintenance would preceded valve failure.

Wet 1

iTrader: (4)

David, sometimes you scare me regarding your detailed knowledge of valve train and rotating assemblies! Thanks for your input.

DavidNJ

I have a question: are the LS7x heads sold as cast or CNC'd? If as cast, will any of the top head shops (boy has that term changed meaning in the last 35 years)--TEA, ET, etc.--offer CNC'd versions?

Thanks,

David

Dune-LS1

I have another question... I only want to run a Jesel shaft mounted rocker arm system on these heads... Has WP looked at the feasibility of retrofitting a Jesel system onto these heads?

Quickin

so when will these be available?

Have they been flow checked yet?

Prices yet?


.

Dune-LS1

Did Manley give you any prices on a 2.200 titanium valve?

Dune-LS1

Read this https://ls1tech.com/forums/generation-iv-internal-engine/480224-warhawk-answers.html And prices, last I heard, are 799.00 bare <(each) And 1,029.00 to 1,134.00 for the assy. <(each)

Wet 1

iTrader: (4)

They are as cast David. I've heard nothing about anyone having a CNC program YET, but it's still early.

Wet 1

iTrader: (4)

Suggested retail is ~$100 / valve.

DavidNJ

Most finished Ti valves are $90-100/valve. Custom finished ones are about $20-30 more.

Wet 1

iTrader: (4)

At $500 for the set, that's why I was hoping the GM LS7 valves could be used. It would have made the choice to go Ti a little easier. BUT, I certainly understand why WP wouldn't design the heads around this valve.

Warhawk 1

Wow, bunch of stuff.

David, they are a cast version of a cnc'd port from a valued source.

Dune, in our cylinder head we believe we have left enough material to install a Jesel system.

David, according to our sources (valve and guide suppliers) the 5/16 stem should not be a problem given adequate bearing surface (7 times diameter). We have that. Our big big block uses 11/32 stems with a valve size of 2.300". Even in our 900 hp drag motors we use 11/32 stems. So we are reducing the diameter of the valve by .100" and only reducing the size of the stem by .015" per side. In my opinion not significant and will provide adequate durability.

Guys, in all out everything goes, class driven, weight restricted, SANCTIONED racing applications, grams I'm sure are worth fighting for. And yes weight = parasitic drag. I think the issue is really not worth the time being spent on it... Why then did GM do it? To wring every inch pound of torque and power out of the motor so they could stake the claim as having the first production car motor with 500+ horse power (505 I believe was reported).

I hope this helps.
B

dhdenney

iTrader: (53)

Any flow testing been done on your heads yet?

Dune-LS1

No They are not out of production yet.> (From what I've been told)