SweetS10V8

iTrader: (4)

I got my new GM LS3 hollow stem intake valves today from the dealership (#12569427).

I was only expecting them to the exact same valve but with a hollow stem to make them lighter, but I was wrong. They look much more finished than the stock L92 valves. They are fully machined on the top of the head and on the bottom side as well, where the L92 piece looks cast. So if your looking at complete cylinder heads on ebay or something and are wondering if they have the hollow stem valves or not, check out the bottom of the valve for a possible give a way.

I had to weight them for myself even though I had seen posted weights in other threads. I saw a 19g difference between the two.

405HP_Z06

iTrader: (11)

Great info

Bandit28

iTrader: (28)

Are those only the intake valves? or did you get all 16 for $200

SweetS10V8

iTrader: (4)

Just the eight intakes. $22/each +tax.

offaxis

iTrader: (19)

Were the exhaust valves hollow on the ls3 head? or were they the same

1.8t

The exhaust valves are not hollow on the LS3.

SweetS10V8

iTrader: (4)

The LS6 exhaust valves were sodium filled from what I recall, but not the L92/LS3 stuff.

Silvy6.0

iTrader: (5)

Sorry to bring up and old thread but could you just swap out the intake valves if you have a set of L92 heads? Just wondering. Again, sorry for bringing up an old thread.

Silvy6.0

iTrader: (5)

Also, what are the casting numbers on the LS3 heads?

cam

iTrader: (9)

I think there's a few variants of the L92 valve in terms of finish iirc. Regardless great post and you should add this info into the sticky here

https://ls1tech.com/forums/generatio...-l92-info.html

bearcatt

iTrader: (41)

Are the LS3 valves longer than the L92 valves ?



.

The stunningman

iTrader: (47)

I just asked pretty much the same question.

https://ls1tech.com/forums/generatio...-question.html


So basically you guys running the LS3 heads are having to use different length pushrods intake and exhaust?