cam q i cant find anywhere...

[xonelith]

1. Does anyone know one way or the other if this will not work in a 3x00 engine. im not asking if i have to test it -- has anyone actually used a cam this large with the canted valve Gen III Aluminum heads with 1.6 roller rockers?

My cam specs after the rockers are a little larger than what you have quoted above (using stock rockers). I'm using 127 lb springs, stock lifters (ya, this might be a problem), stock pushrods( plan to get the chromolly ones from Milzy) and so far, haven't had any problems. I WOULD not use stock springs as, from what I have been told, cannot take the lift.

IMO

[bszopi]

Russell, not to sound offensive, but you need to calm down. If you know you will have to test it out, why are you getting so pissed off about all of this?

Milzy's Stage 2 NA - .347/.349 lobe lift (.556/.559 valve lift),
222.1/225.7 duration,
110 LSA, 106 IC

Those are the specs that xonelith has. But he also has "special" heads from Milzy to match the cam. What's done to the heads? No one knows because Milzy won't tell anyone. Another thing to look at with those specs, that xonelith is failing to address, is the duration. The lift is slightly less, but the duration is longer, which will give the valves and pistons more time to possibly hit.

With that said, no.. no one has used a cam that large with the 3x00 heads, at least that has mentioned anything on this site (as you found out by searching). You have also failed to answer Curtis's question regarding the type of cam this is, which could again change things entirely.

Finally, I respect you, but you always find a way to get all pissed off whenever you come to this site. And I have yet to figure out why. You are acting like you did when people were looking into the 3x00 topend on a 3.4SFI engine. People would ask questions, you'd answer them, they'd question something you said, and next thing you know, you were going off like you are in this thread. And then you storm off... Only to return awhile later and do it all over again.

[xonelith]

Those are the specs that xonelith has. But he also has "special" heads from Milzy to match the cam. What's done to the heads? No one knows because Milzy won't tell anyone.

As mentioned before, my springs are 127's, 9 angle swirl polished valve job, lots of porting and polishing, milled 0.015. A few other things to the valves, that I don't understand Not sure what it is that is secret (this is on his website and mine).

Using stock lifters, rockers and pushrods.

[bszopi]

9 angle valve job?

[94Camaro]

lol.. thats a lot.

look brad the reason i got upset was cause im in here looking for answers and i get treated like a noob cause i didnt explicitly say that i searched for 30 mins and then posted. because i get treated like a noob everytime i post just for asking questions. this particular board has a lot of big egos and no patience on it.

apologies to anyone who takes offense but thats just my opinion.

as for Curtis' question - It's a solid flat tappet camshaft (mechanical) at those specs. its basically crane's largest cam for the 2.8/3.1/3.4 (it was made with the iron heads in mind, thats why i don't know if it'll work. now the only reason im consdernig it?

cause its already shippign to me and i got it for free. yes. no cost. im trying to evaluate what i would have to spend to get the rest of the parts and make it work. but no one can or will tell me what the answer to my question is. they just all tell me i have to test (well duh) and that i should do a search before posting cause obviously there are answers on here and i will probably find what im looking for instead of wasting their valuable time.

with that said, im sorry im mucking up your board. ill try not to in the future.

[Guest]

94camaro, yes it is frustrating when trying to build a combination like this.

I was just discussing something similar with my machine shop today, max lift of the stock heads and for some reason .520 seems to ring a bell, before the retainer hits the seal, I'm not sure why, 'cause it has been a few years since I did all this testing.

Either way, you will have to verify this on your own. There really is no straight answer that we can give you, since I'm not sure of anyone (Besides Curtis) that is using any higher lift than about .480 to .500ish, and he's using iron heads.

Let me know how that cam works, it is a possible cam for my next build, but I'm still leaning towards a mechanical roller profile.

[TurboZ24]

Typically a flat tappet cam is limited too a maximum open spring pressure of 300-350 lb, because the oil film strength. Much more and the oil film simply fails and you get metal to metal contact.

[v6h.o.]

The valve guide can easily be ground down for more clearance.

The one thing I've wondered for a while with The splayed valves is how much duration/overlap would get you in trouble with the splayed valves/Larger valves.

IE if you take both valves set them in the head with no springs, then push them out to the point where both hit and contact with each other..... It would happen at lower durations with larger diameter valves, But I'm not sure if there would be a point with stock sized valves that this would happen.

I've meant to measure out how many inches of lift it is where these contact however the duration thing is the variable.

[Guest]

The valve guide can easily be ground down for more clearance.

The one thing I've wondered for a while with The splayed valves is how much duration/overlap would get you in trouble with the splayed valves/Larger valves.

IE if you take both valves set them in the head with no springs, then push them out to the point where both hit and contact with each other..... It would happen at lower durations with larger diameter valves, But I'm not sure if there would be a point with stock sized valves that this would happen.

I've meant to measure out how many inches of lift it is where these contact however the duration thing is the variable.

I had that measurement at one time too, I think I posted it on GMForums.... Remember those days?

IIRC I think lift was around .300" for both valves, at the point of contact. But again, it's been a long ass time since I messed with that.

[v6h.o.]

I had that measurement at one time too, I think I posted it on GMForums.... Remember those days?

IIRC I think lift was around .300" for both valves, at the point of contact. But again, it's been a long ass time since I messed with that.

LOL, yeah damn that seems so long ago.

[sil]

for my 2.8 block and 3100 heads with 1.6 stock rollers, .469/.469, (.040 gaskets) head milled .010 from stock, i had .090 clearance to the valve seal/guide and i had to have my pistons cut for clearance. .090 is recomended clearance

when you go with such a high lift and lets say you cannot take any more down off the guide, and you are forced to use longer valves (which most likely wouldnt be the case, becuase you can mill the spring seat as well) you are fuckored for geometry, unless you go with aftermarket full roller rockers with the adjustable studs and polylok nuts

[94Camaro]

well thats another issue. the rocker arms on the aluminum heads arent adjustable are they? meaning that i need to get adjustable roller rockers.. cause this cam's spec card reads .022 lash hot.

last i read the aluminum heads used non-adjustable roller rockers (not roller tipped.)

[v6h.o.]

well thats another issue. the rocker arms on the aluminum heads arent adjustable are they? meaning that i need to get adjustable roller rockers.. cause this cam's spec card reads .022 lash hot.

last i read the aluminum heads used non-adjustable roller rockers (not roller tipped.)

You can use the Comp Roller tips with the old GM adjustable studs #476530, and guide plates from a gen2 alum heads or the early 94-95 gen3 heads with stamped rockers.

Or the Crane gold rockers with the crane conversion studs that have the M10 and 3/8ths top nut.

Both of these options work on the gen3 heads. Regular stamped steel rockers will work and be adjustable with the old adjustable rocker stud and the proper M10 nut and M10 pivot ball.