bigwindsor

Do the new CNC L92 heads have the heavy stock L92 valves or the lighter LS3 valves?

cbrracer

iTrader: (10)

Pretty sure their not the sodium filled hollow ones.

See5

iTrader: (53)

Who's new CNCed?

Robin L

Your prolly taliking about the GM Performance Parts CNC L92/LS3 heads.

The set that I have has the L92 Valves. I think that when they made the run of heads they used complete L92 as their basis. At the time of the run the LS3 were not available.

I am going to order a set of the LS3 Valves and swap them out after a little dyno use.

Robin

bigwindsor

Are the exhaust valves lighter also? Or are you just swapping the intake valves? One other question is would the ls7 springs work on these heads with a cam of 234/240 @.050 with a lift of .605/.609 ? Sorry for all the questions but I'm a long time Ford racer now switching over to the LS stuff!

Robin L

From what I remember the exhaust valve is the same.

The installed height on the LS7 is taller. I would use a valve spring from Lunati.

FORD RACER Where do you think that I got my start....welcome


Robin

bigwindsor

I think I've heard of you before Funny part is I've also been a GM Parts Manager for about 10yrs! Thanks for the help!

p.s. The motor is going in a light weight mustang coupe