Milzy cam ?'s

[Baggedgp]

What would have to be done to the stock heads on a 96 3100 to use the milzy stage 2 cam. I dont feel the need to spend a 1000 on heads when i can have the wor done at a race shop here locally

Thanks
Justin

[SappySE107]

RE: Milzy cam ?

Im sure milzy doesnt feel the need to help you with that information either. No one else can really say what he does or why he does it other than him. The race shop should be able to help you out with what needs to be done.

[ikessky]

RE: Milzy cam ?

Porting and polishing, a valve job, and stiffer springs. You could also look into lighter valves while you were at it. How much of each? I don't really know. Like Ben said, they don't help you much with specs.

[AaronGTR]

RE: Milzy cam ?

Stage 1 cam you can run without adding anything but LS6 valve springs. The stage 2 cam, well... I don't know the lift specs on that cam but you can only run up to .55" lift before getting too close to spring bind. I know milzy as originally talking about making some head modifications on his stage2 setup so you could run higher lift than that. I don't know if he did or not.

If you get a stage2 cam though you'll get a spec sheet with it, and if you have that any good race shop can look at the numbers and tell you what they can do to make it work, whether it's machining the springs seats or whatever.

[blackbombshell95]

RE: Milzy cam ?

Stage 2 specs are

Stage 2: .347/.349 lobe lift, 222/226 duration, LSA = 110, 106 intake center

[v6h.o.]

RE: Milzy cam ?

Mill down the valve guides a few thou to give the clearance between the guide/retainers.

[SappySE107]

RE: Milzy cam ?

What about the valve springs. When do they coil bind? THe valve guide was the only thing I saw that would possibly get in the way at .550 with the valves stem seal on there. Without the guide, you can go to .650.

[AaronGTR]

RE: Milzy cam ?

Not sure about that. The stock LS6 intake valve lift is .552" already, and our installed height is .1" shorter so at the same lift we'd already be at the same spring height as .652" on the LS6. Anyone know what the max height and LS engine can run on a stock spring? The LS6 lobe lift is .322/.324, so if milzy's stage2 is .347/.349 you're already higher than that, minus the .1" and your max lift would be equal to .6584" on an LS6. My stage1 boost cam is .514/.526 valve lift and the top coils of the spring were all touching. I only had space between about the bottom three coils. I suppose that would be enough for an extra .05-.06 of lift (doesn't seem like much does it?), but at that point might it not be safer to just go with a comp cams LS spring since they have more coil spacing?

At least I didn't have to do anything with my valve guides for my cam, but he still made it pretty agressive for a stage1.

[SappySE107]

RE: Milzy cam ?

I had the shop here look at them. We can go .560 lift without problem and room to spare. I don't really know of a setup that would need to go over that anyway when duration could be increased and max lift brought down some. Lorenzo is at .53x max lift right now and it works so thats a known good lift.

Yeah, comp springs would be the way to go with more lift, but then you are probably looking at machining the valve guide down and the valve seat area as well to change the installed height closer to the LS1 stock installed height. The valve stem seal gets in the way before coil bind I think. Id have to put one in and see where its max lift is.

[geoffinbc]

Comp has retainers designed to fit an LS6 spring on an LTx or Vortec head with the correct install height. My bro just got some for the project we are doing on his 4.3L. We are installing LS6/LS2 springs (From Comp) and installing Pro Magnum roller rockers.

These may be the ticket for installing an LS springs at the correct height.