Cam for ZZ4? Is LT4 HOT the way to go?
#1
Cam for ZZ4? Is LT4 HOT the way to go?
Hi all,
I have heard that the LT4 HOT cam will realise about 395 HP in the ZZ4. Bear in mind I am carb (running a 750 Holley) What other options are there? The car is really a weekend car and lopey idle won't be much of a problem.
So;
1) What cam shoudl I go for?
2) Do I just buy the cam or do I need new springs etc.
3) How much I am likely to need for both the cam and a garage to fit it?
If I was running a 13.8 before, could I expect low 13's? with the change?
Really appreciate the help guys as the misses has given me the sign off to mod the car
Yipee!!!!
Thanks,
Felix
I have heard that the LT4 HOT cam will realise about 395 HP in the ZZ4. Bear in mind I am carb (running a 750 Holley) What other options are there? The car is really a weekend car and lopey idle won't be much of a problem.
So;
1) What cam shoudl I go for?
2) Do I just buy the cam or do I need new springs etc.
3) How much I am likely to need for both the cam and a garage to fit it?
If I was running a 13.8 before, could I expect low 13's? with the change?
Really appreciate the help guys as the misses has given me the sign off to mod the car
![Big Grin](https://www.thirdgen.org/forums/images/smilies/biggrin.gif)
Thanks,
Felix
#3
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Car: 1991 Camaro Z28 5.7 G92
Engine: L98 Tuned Port Injection
Transmission: TH700R4
Axle/Gears: 3.23 Posi G80
YES get the HOT cam it is great! I've never drivin the ZZ4 but the hot pulls hard and it idles cool too. IMO it's the best Hyd/roller cam out there. I'm only running the 1.5 rockers but it stills dominates at the track, with 1.6's I suspect I will be in the 12's. Get the whole kit from GM, I have comp springs and they work great but I am limited to the 1.5 rockers and .492 lift for now.
#5
There are two ways to go with the HOT cam. You can get just the cam, or you can get the kit (p/n 12480002). The kit includes the cam, 1.6 roller rockers, light weight valve spring caps, special valve springs and a few other items. This kit does not include the roller tappets.
#6
I currently am running the XM270HR cam and it is very similiar to the hot cam, 218/224 durration with .495/.503 lift with a 112 lobe seperation. I wish I would have gone with the XM276HR cam. It is 224/230 duration with .503/.510 lift and 112 lobe seperation.
There is also another grind comp makes that has 110 lobe seperation with similiar specs.
But I would go with 224 deg intake duration if I had it to do over again. But I also have 3.42 gears and a standard.
There is also another grind comp makes that has 110 lobe seperation with similiar specs.
But I would go with 224 deg intake duration if I had it to do over again. But I also have 3.42 gears and a standard.
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#8
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Car: 92Z28
Engine: L98
Transmission: A4
Originally posted by ZZ42Fast
But I could ust buy the cam right (not the kit), it should fit right in?
How much and how much to install do you reckon?
Cheers & Happy New Year!!
Felix
But I could ust buy the cam right (not the kit), it should fit right in?
How much and how much to install do you reckon?
Cheers & Happy New Year!!
Felix
Hotcam-$175
Springs-$55
Intake/Timing chain gaskets-$35
#10
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Car: 92Z28
Engine: L98
Transmission: A4
I could do it in about 4-6 hours on your car since it is carbed. Maybe a couple more hours to do the springs. I have no idea what shop rates are over the pond so I won't even speculate as to how much $.
Good luck,
Charlie
Good luck,
Charlie
#11
Thanks again Charlie,
Just seen this on salee Chevrolet site;
24502586 LT-4 Hot Cam, hydraulic steel roller designed for showroom stock racing.
12370839 1.6 ratio roller rocker arms. Required for the LT-4 Hot Cam.
Will I need that second part too? Am confused and clueless about cams.
Thanks
Just seen this on salee Chevrolet site;
24502586 LT-4 Hot Cam, hydraulic steel roller designed for showroom stock racing.
12370839 1.6 ratio roller rocker arms. Required for the LT-4 Hot Cam.
Will I need that second part too? Am confused and clueless about cams.
Thanks
Last edited by ZZ42Fast; 01-05-2004 at 05:33 AM.
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Car: 92Z28
Engine: L98
Transmission: A4
Sorry,
I haven't been back to this thread for a while. You don't have to buy the rockers. Your stock rockers will be fine. That's what I'm running.
Happy modding,
Charlie
I haven't been back to this thread for a while. You don't have to buy the rockers. Your stock rockers will be fine. That's what I'm running.
Happy modding,
Charlie
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