5.3-on-steroids

iTrader: (3)

Im assembling a bare set of LSA heads for my 370 FI build. I have a set of LS3 hollow stem intakes and for the exhaust I have a set of valves I pulled from a 08' LY6 6.0 engine that was in a boat. I have heard over and over again that the LY6 exhaust exhaust valves were made of inconel but I see surface rust on the lower part and I was under the impression that inconel was rust resistant. As a matter a fact I put them side by side to the LS3 exhaust valves and they are identical in every way, both are non magnet with a welded tip, both weigh approx 90 grams, and both will rust.

So this said my question is how am I supposed to tell for sure if these are inconel or just a regular old valve? There is at least a part number on the intake valves but no such thing on the exhausts. Any help is appreciated, Thanks

Gray86hatch

iTrader: (83)

Those exh are not Inconel. I change them out to ferera exhaust valves and run the stock ls3 intakes no problems

Tim

S10xGN

iTrader: (11)

Inconel = $$$. I retired from the oil industry a few years ago. When specc'ed, a 2" Inconel globe valve was over $10k vs around $500 for a carbon steel valve. I would assume this cost ratio could be directly applied to an automotive valve. In other words, I do not believe GM would intentionally spend unnecessary money on valve material...

KCS

iTrader: (20)

The weight is how you will tell. The stock LS3 exhausts are 90g, I just weighed one last night. The Inconel will be heavier by a lot.

5.3-on-steroids

iTrader: (3)

I know I don't believe they are inconel either. So what's all this crap everywhere saying that they are? Seems like a lot of unnecessary money for gm to spend.

5.3-on-steroids

iTrader: (3)

And why are the exhaust valves non magnetic while the intakes are if they are both just steel?

linicklo

ive been getting my setup from brian tooley, since im going to be getting a custom cam from him, he suggested i run ls3 intake & the stock ly6 exhaust in my sprayed 6.0 and im gonna take his word for it

Brian Tooley Racing

iTrader: (13)

We did some tensile strength testing on a bunch of valves a while back and the GM valves tested 50% higher than the Ferrea valves, so they seem to be good. Stainless valves are non magnetic, at least higher quality ones are.

5.3-on-steroids

iTrader: (3)

So is there actually any difference between the ls3 and ly6 exhaust valves?

Gray86hatch

iTrader: (83)

Other than the sadder tips on the stock valves they are great

Tim