LT4 Hot Cam
Thread Starter
Racer
Joined: Jan 2001
Posts: 322
Likes: 0
From: Liberty Township OH
How much HP would the Hot Cam add to an LT4 engine? What improvement would there be in the 1/4 mile? Do the springs & lifters need to be replaced? How much is it for the kit (i.e. whatever is required - cam, springs, lifters, etc.). My LT4 is bone stock, should I consider other mods before going to this one?
Racer
Joined: Feb 2001
Posts: 480
Likes: 1
From: Ham Lake, MN
My GS was completely stock except for the Hot Cam when I bought it. It had been dynoed before and after the cam pulling 294RWHP before and 326RWHP after. I've since added the Corsa and K&N, but it hasn't been back to the dyno (not that I would expect big gains from these last two items). I doubt I'll do much more to the car, but I'm guessing I can get a little more out of the cam if I free things up on the intake or exhaust side. I might add a 52mm TB and/or shorty headers at some point, I'm just not sure if I can justify the expense.
Since the cam was already installed, I can't answer any of your installation questions. And I've never had it down the 1/4 mile.
Hope this helps!
Since the cam was already installed, I can't answer any of your installation questions. And I've never had it down the 1/4 mile.
Hope this helps!
Racer
Joined: Dec 2000
Posts: 465
Likes: 0
What about the ZZ-9 cam from TPIS or any other of the cams featured at their website:
http://www.tpis.com/pg13-16.html. Or would the LT-4 hot cam be better? Does that kit come with roller rockers and push rods? Maybe thats the 350 hot cam kit I'm thinking about from GM Performance.
http://www.tpis.com/pg13-16.html. Or would the LT-4 hot cam be better? Does that kit come with roller rockers and push rods? Maybe thats the 350 hot cam kit I'm thinking about from GM Performance.
Racer
Joined: Oct 2000
Posts: 456
Likes: 0
I have the Hot cam and I love it. Sorry, I can't give you "before and after" dyno numbers, but it is a nice improvement. As far as the ZZ9, you would be paying almost twice as much for a smaller cam. I have heard good things about it, but for the price I can get the Hot cam and a few other little things to go with it. Just my opinion.
Burning Brakes
Joined: Apr 2000
Posts: 959
Likes: 1
From: Lemoore CA
My Hot cam is in the mail and on the way. I had debated between Lingenfelters cam and the hot cam. At over $100 less I went with the hot cam and think Im gonna be pretty happy. I think youll need a new set of springs and would suggest getting 1.6 rockers as well. You can get cheap springs and rockers for $30 and $50-80 respectively, and could spend nearly $500 on the springs and rockers if you go all out. My 2 Cents, get the $500 LT4 Hot cam kit, comes with the cam, springs and rockers along with everything else youll need.
Paul
Paul
Racer
Joined: Oct 2000
Posts: 456
Likes: 0
I always suggest changing the stock springs when going with a larger cam- just to be safe. My stock LT1 springs started getting weak with the stock cam. Didn't notice it until after I made several trips down the track and the motor was good and warm, then the valves started to float at high rpms. Really a cheap investment.
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Racer
Joined: Oct 2000
Posts: 456
Likes: 0
Neal,
I used the springs in the Hot cam kit and was very pleased with them. I don't know, are they the same springs that came stock on an LT4? I didn't think so because the cam in the stock LT4 is very similar(don't have the specs handy) in lift and duration to the LT1 cam so I assumed they used the same springs as the LT1, but I may be wrong. Even so, after putting 60,000+ miles on the motor and the stock springs plus installing a larger cam, I would go with the springs that the manufacturer recommends for that cam- especially if you venture to the track. Just my opinion.
I used the springs in the Hot cam kit and was very pleased with them. I don't know, are they the same springs that came stock on an LT4? I didn't think so because the cam in the stock LT4 is very similar(don't have the specs handy) in lift and duration to the LT1 cam so I assumed they used the same springs as the LT1, but I may be wrong. Even so, after putting 60,000+ miles on the motor and the stock springs plus installing a larger cam, I would go with the springs that the manufacturer recommends for that cam- especially if you venture to the track. Just my opinion.
Racer
Joined: Oct 2000
Posts: 456
Likes: 0
Polar LT4,
I see you are from Middletown, OH. I did a lot of growing up there. In fact, my mother and her side of the family still lives there. I come up to visit 4-5 times a year. Nice in the Summer, but not in the winter! Good luck with the cam.
I see you are from Middletown, OH. I did a lot of growing up there. In fact, my mother and her side of the family still lives there. I come up to visit 4-5 times a year. Nice in the Summer, but not in the winter! Good luck with the cam.
Race Director
Joined: Jul 2000
Posts: 11,007
Likes: 1
From: Probably in the paint booth....
Dr. Doom,
The springs are different between the LT1 & 4
85 lbs. (38.6 kg.) Seated for the LT1
GM Part# 10206040
100 lbs. (45.4 kg.) Seated for the LT4
GM Part# 12551483
I pulled these from the LT4 web site.
Anyone know what the spring PN is that comes with the Hot cam kit ????
Edited: found them
valve springs GM# 12551483 (with the kit)
so they are the same as the factory LT4 springs!!!!
Neal
[This message has been edited by Arisa (edited 07-27-2001).]
The springs are different between the LT1 & 4
85 lbs. (38.6 kg.) Seated for the LT1
GM Part# 10206040
100 lbs. (45.4 kg.) Seated for the LT4
GM Part# 12551483
I pulled these from the LT4 web site.
Anyone know what the spring PN is that comes with the Hot cam kit ????
Edited: found them
valve springs GM# 12551483 (with the kit)
so they are the same as the factory LT4 springs!!!!
Neal
[This message has been edited by Arisa (edited 07-27-2001).]
Racer
Joined: Oct 2000
Posts: 456
Likes: 0
Imagine that. I guess we learned something today. I didn't know. I race my car a good bit, so whenever I change cams, I usually change the springs as well.
Originally Posted by Arisa:
[B
[B
Dr. Doom,
The springs are different between the LT1 & 4
85 lbs. (38.6 kg.) Seated for the LT1
GM Part# 10206040
100 lbs. (45.4 kg.) Seated for the LT4
GM Part# 12551483
I pulled these from the LT4 web site.
Anyone know what the spring PN is that comes with the Hot cam kit ????
Edited] found them
valve springs GM# 12551483 (with the kit)
so they are the same as the factory LT4 springs!!!!
Neal
[This message has been edited by Arisa (edited 07-27-2001).][/B][/color]
The springs are different between the LT1 & 4
85 lbs. (38.6 kg.) Seated for the LT1
GM Part# 10206040
100 lbs. (45.4 kg.) Seated for the LT4
GM Part# 12551483
I pulled these from the LT4 web site.
Anyone know what the spring PN is that comes with the Hot cam kit ????
Edited] found them
valve springs GM# 12551483 (with the kit)
so they are the same as the factory LT4 springs!!!!
Neal
[This message has been edited by Arisa (edited 07-27-2001).][/B][/color]
