Camshaft question...

[EspanolaGuitarista]

I looked in GMPARTSDIRECT for a roller camshaft. They have one measuring around 204 degrees. What do you guys think of this. The price seems right. Could I bump this up with high ratio roller rockers. I am wondering what would happen if I ran a 1.85 instead of the stock 1.6? Is this possible? Also how would I go about milling my head to run that Stage II Milzy camshaft? Would I have to shim it or go the other way and grind it down? Any help would be appreciated.

[eliteweapons]

need more info on the engine. More lift does help.

[geoffinbc]

Im pretty sure that is just the stock cam for a 3X00. I know GM has other cams for the 660 but they are all flat tappet cams.

To date I would not even consider Milzy's cams because they have no damn specs. Who the hell knows what you are getting.

[eliteweapons]

Yes I looked at their site and they say stage 1 or 2 but no specs. So far unless something has changed in the last 3 months no one makes a roller cam replacement for the 3x00. A regrind is your only option.I had mine reground and the specs are 272 lift with a 215 duration at the cam. using a 1.6 rocker that equates to 439 at the cam. with 1.7 its 462 and with 1.8 its 489.6

[xonelith]

Im pretty sure that is just the stock cam for a 3X00. I know GM has other cams for the 660 but they are all flat tappet cams.

To date I would not even consider Milzy's cams because they have no damn specs. Who the hell knows what you are getting.

He probably hasn't gotten around to updating the site. I have some of the specs (lift and duration) on my website under my mods section.

I'm curious why you wouldn't even consider his cam? I'm runnin' 13.991 using his cam and heads, HPTuners and full exhaust (all for around 5000; how much is a blower???), and there are a few others who are runnin' pretty good times. I'm also running stock weight and All Season radials.

I can't believe people are still sceptical, but that's your opinion, which I can't argue.

I would recommend the cam, but I'm really nobody, just a consumer.

xon

[eliteweapons]

What ratio rockers are you using? Is that a roller cam?

[SHOoff]

There are 2 cams listed in the GM performance parts catalog. What you saw is probably one of them. They have the same specs, except the lobe centerline on one is 107 and the other is 112. Both cams are for the Gen II motor.

[xonelith]

What ratio rockers are you using? Is that a roller cam?

Stock rockers... can't take any more lift Using some heavy duty valve springs to take the lift. I'm probably good to about 7500 rpm, give or take.

[geoffinbc]

Im pretty sure that is just the stock cam for a 3X00. I know GM has other cams for the 660 but they are all flat tappet cams.

To date I would not even consider Milzy's cams because they have no damn specs. Who the hell knows what you are getting.

He probably hasn't gotten around to updating the site. I have some of the specs (lift and duration) on my website under my mods section.

I'm curious why you wouldn't even consider his cam? I'm runnin' 13.991 using his cam and heads, HPTuners and full exhaust (all for around 5000; how much is a blower???), and there are a few others who are runnin' pretty good times. I'm also running stock weight and All Season radials.

I can't believe people are still sceptical, but that's your opinion, which I can't argue.

I would recommend the cam, but I'm really nobody, just a consumer.

xon

Because not everyone is after a motor that can rev to 7500 and not everyone can install a cam thats too agressive because of emissions and drivability concerns. If he had specs then it would be extremly helpful in making a descision.

This cam was designed to match our Stage 2 Heads. This combination will run on a stock pcm, but we highly suggest upgrading to an aftermarket tuned PCM to get the most out of the setup. Look for gains of 50hp or more from these parts when combined with the appropriate supporting mods. You MUST use stage 2 heads with this cam, as the cam lift is too high for stock heads.

That is the info you get. WTF is that shit. What is the basic operating range, lift, duration, overlap, intake center, valve spring and compression ratio recommendations.

Basically that mesage says to me buy my cam and you have to buy my heads and get your computer tuned.

[xonelith]

Im pretty sure that is just the stock cam for a 3X00. I know GM has other cams for the 660 but they are all flat tappet cams.

To date I would not even consider Milzy's cams because they have no damn specs. Who the hell knows what you are getting.

He probably hasn't gotten around to updating the site. I have some of the specs (lift and duration) on my website under my mods section.

I'm curious why you wouldn't even consider his cam? I'm runnin' 13.991 using his cam and heads, HPTuners and full exhaust (all for around 5000; how much is a blower???), and there are a few others who are runnin' pretty good times. I'm also running stock weight and All Season radials.

I can't believe people are still sceptical, but that's your opinion, which I can't argue.

I would recommend the cam, but I'm really nobody, just a consumer.

xon

Because not everyone is after a motor that can rev to 7500 and not everyone can install a cam thats too agressive because of emissions and drivability concerns. If he had specs then it would be extremly helpful in making a descision.

Well, I'm not revin' to 7500, just that I can with the head work. I'm shifting around 6800. He makes a stage I cam if this is too aggressive. Emissions will probably be an issue at idle, but other than that, I may pass emissions Driveablity is surprisingly good.

This cam was designed to match our Stage 2 Heads. This combination will run on a stock pcm, but we highly suggest upgrading to an aftermarket tuned PCM to get the most out of the setup. Look for gains of 50hp or more from these parts when combined with the appropriate supporting mods. You MUST use stage 2 heads with this cam, as the cam lift is too high for stock heads.

That is the info you get. WTF is that shit. What is the basic operating range, lift, duration, overlap, intake center, valve spring and compression ratio recommendations.

Basically that mesage says to me buy my cam and you have to buy my heads and get your computer tuned.

I think he just has to update the site. I think originally, it wasn't posted as he was still in the design phase. A simple email to him would have answered those questions.

[Guest]

I agree, with BTY, No specs, No care.

I selected my cam based on more than "This is a good cam", I compared specs, hell I think I ran several cams through DD2K, before I bought mine.

[geoffinbc]

Exactly. Raven runs boost so his concern between 2 cams with the otherwise same duration is going to be LSA and IC so he can build cylinder pressure. For a guy towing a trailer he might want a narrow LSA and a short duration with a high lift so he has max torque right in the low RPM range so he can stay in 5th up a hill or run a low stall converter and keep that baby locked on the highway.

I know he probabally has the specs on the cams somewhere. But IMO that should have been the first set on information on the camshaft page.

Same with the heads. How much lift can they take? What do they flow? What is the open, closed and install height of the springs on them? Maybe I already have a custon high lift cam and I am in the market for some heads. How am I suposed to buy compatible heads when there is no specs on them?

Again should have been the first set of info on the heads page.

Flip through Edelbrock, Crane or Comp catalogues. All the specs are easily found. Hell the printed catalogue I have here has cross refrence charts so I can compare heads or cams at a glance.

[onefastV6]

I have e-mailed Milzy and got the following specs so I think I will share.

Stage 1 NA - .305/.308 lobe lift (.488/.493 valve lift),
209.4/213.1 duration,
110 LSA, 108.1 IC

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

Also 3x3 on the GAGT forum had a cam done from cammotion, before Milzy started selling them.
His specs are listed here http://www.gbnperformance.com/Cam%20Specs.png

[eliteweapons]

Just to clarify. Is that a roller cam??

[bszopi]

Yes.