zr1 cam
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TECH Resident
Joined: Jun 2009
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From: Elizabeth City NC
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Thread Starter
Teching In
Joined: Dec 2014
Posts: 13
Likes: 0
From: Sebastian TX.
sorry .. I'm kind a new on this .. I have a 2003 silverado with a 4.8.l Im building a 76mm turbonetics with stock engine. Stock transmission with 373 gears 20s Texas editions .. I'm bearly doing my reaserch .. I just wan to know what r my options..?
Seems lika any cam with no overlap will do reasonably well, just timing events are off so it lacks what a turbo grind would offer. Turbo grind being a semi generic as combinations ultimately dictate. The ls9 cam does tend to lose some cranking compression to the other stock cams... on a 4.8 a ls6 cam might be better option depending on your goals. Maybe someone can shed some more light in comparison.?
Launching!
Joined: Oct 2006
Posts: 201
Likes: 0
From: Grand Rapids, MI
If you have a GEN III engine, by the time you go through the trouble of doing the front cover, sensor, harness extension, etc, you would be better off just having Martin at Tick spec you an ideal cam for the situation. Cams aren't expensive. You don't have much to gain by cutting corners in the cam department.
Jack
Jack
Thread Starter
Teching In
Joined: Dec 2014
Posts: 13
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From: Sebastian TX.
If you have a GEN III engine, by the time you go through the trouble of doing the front cover, sensor, harness extension, etc, you would be better off just having Martin at Tick spec you an ideal cam for the situation. Cams aren't expensive. You don't have much to gain by cutting corners in the cam department.
Jack
Jack
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
No, they will spontaneously combust when their sensors detect a ZR1 cam. 
Unless you go with some radical over the top one-off drag only cam that requires a .750+ lift spring, pretty much any cam that anyone stocks on any shelf anywhere will work with your heads.
Unless you go with some radical over the top one-off drag only cam that requires a .750+ lift spring, pretty much any cam that anyone stocks on any shelf anywhere will work with your heads.
I have given the OP a recommendation I believe, but would be glad to answer any more questions you have sir.
The ZR1 cam is low on overlap which will help keep reversion at bay, but more power can easily be made with a more specific turbo oriented camshaft profile.
On The Tree
Joined: Nov 2012
Posts: 101
Likes: 0
This is just my personal experience but here is my set up:
86 Monte Carlo SS
JY 5.3 from a 99 Tahoe
LS1 Intake
80 Lbs Injectors
Truck manifolds facing forward
Master Power T70 turbo with .68 A/R Exhaust Housing
LS9 Cam
Pac 1218 valve springs
4L80E controlled by a US Shift controller
MegaSquirt II running fuel and ignition
Bosch 044
Cooling Mist Meth injection
With this very simple setup the car is a beast.
I don't have dyno numbers but I can tell you that it is very stout from a seat of the pants view.
At 7 lbs of boost the car is an animal.
At 12 lbs of boost the car is very scary.
At 18 lbs of boost it is dangerous, no joke. There is a spot on the interstate close to my house that has a pair of tire marks I left that are easily over 600 feet long and could have been a lot longer if I had bigger *****, it was done when I floored it at 70 MPH and it blew the tires off. I didn't realize how much rubber I had left until I went back the next day and started laughing my *** off at the hundreds of feet of rubber the car put down so easily.
The cam does make good power and idles as smooth as silk.
Again, this is only my personal build and since I don't have a dyno sheet or timeslips you should take it for what it is worth.
86 Monte Carlo SS
JY 5.3 from a 99 Tahoe
LS1 Intake
80 Lbs Injectors
Truck manifolds facing forward
Master Power T70 turbo with .68 A/R Exhaust Housing
LS9 Cam
Pac 1218 valve springs
4L80E controlled by a US Shift controller
MegaSquirt II running fuel and ignition
Bosch 044
Cooling Mist Meth injection
With this very simple setup the car is a beast.
I don't have dyno numbers but I can tell you that it is very stout from a seat of the pants view.
At 7 lbs of boost the car is an animal.
At 12 lbs of boost the car is very scary.
At 18 lbs of boost it is dangerous, no joke. There is a spot on the interstate close to my house that has a pair of tire marks I left that are easily over 600 feet long and could have been a lot longer if I had bigger *****, it was done when I floored it at 70 MPH and it blew the tires off. I didn't realize how much rubber I had left until I went back the next day and started laughing my *** off at the hundreds of feet of rubber the car put down so easily.
The cam does make good power and idles as smooth as silk.
Again, this is only my personal build and since I don't have a dyno sheet or timeslips you should take it for what it is worth.
If you have a GEN III engine, by the time you go through the trouble of doing the front cover, sensor, harness extension, etc, you would be better off just having Martin at Tick spec you an ideal cam for the situation. Cams aren't expensive. You don't have much to gain by cutting corners in the cam department.
Jack
Jack
Suits most 500-600ish HP builds great IMO. Pushed mine into the 8's pretty easily. I've also run aftermarket cams and there is quite a bit of power to be picked up in the lower RPM over the ZR1 on a 5.3. The lack of power down low helped me launch at higher boost levels and maintain traction while keeping the boost up. From 4800+ it gives a healthy dose of power over the factory truck cam.
The LS2 front cover is less than $50 and is available at local auto parts stores. I've seen LS9 cams for under $100. Mine was $112. I'd think most would be running a new timing set anyway, but you do need the proper toothed cam gear up front.
The more aggressive cams usually require dual springs and upgraded push rods and run around $390 just for the cam. For a budget stock bottom end build, I don't think $600+ worth of of valvetrain components are necessary.
Thread Starter
Teching In
Joined: Dec 2014
Posts: 13
Likes: 0
From: Sebastian TX.
This is what I have so far
76mm turbonetics
60lbs injectos
255 walbro fp
Nnbs intake
90mm tb
Stock transmission
373 gears
What else do I need for the build ?.. What do you guys recommend I'm still debating on the cam.. I'm on a good track or do I need to change something ?
76mm turbonetics
60lbs injectos
255 walbro fp
Nnbs intake
90mm tb
Stock transmission
373 gears
What else do I need for the build ?.. What do you guys recommend I'm still debating on the cam.. I'm on a good track or do I need to change something ?