Max Valve lift on an LT1 Head
01-28-2002, 03:08 PM
#1
Melting Slicks
Thread Starter
Max Valve lift on an LT1 Head
Does anybody know what the max valve lift for an LT1 Head is? I was told that the springs from the LT4 hot cam kit would fit my heads and the max lift there was .580. I was thinking of getting about .555, any thoughts?
01-28-2002, 05:06 PM
#2
Le Mans Master
Re: Max Valve lift on an LT1 Head (mn_vette)
LT4 springs are only good to about .550 lift. Plenty of springs out there that are much better too. Match your springs to your cam.
01-28-2002, 08:27 PM
#3
Team Owner
Re: Max Valve lift on an LT1 Head (mn_vette)
I'd leave this job to a pro.
01-29-2002, 12:59 AM
#4
Safety Car
Re: Max Valve lift on an LT1 Head (mn_vette)
We have used cams as high as .671 lift. In the next week, we will be installing one with this lift again! Of course, we are installing a set of bad boy Pacaloy springs to go with it and some solid roller lifters!!! :yesnod: :yesnod:
If you want, I will install a 1" lift cam in your car. :) :)
Seriously, there is a limit to a ceratin spring, not to the lift in a cam(to a certain degree).
If you want, I will install a 1" lift cam in your car. :) :)
Seriously, there is a limit to a ceratin spring, not to the lift in a cam(to a certain degree).
01-29-2002, 09:24 AM
#5
Melting Slicks
Thread Starter
Re: Max Valve lift on an LT1 Head (Chris@SpeedDemon)
Ok, a little background may help with this one. I just bought a ZZ-9 cam and I'm trying to pick out the roller rockers to go with it. But it's really hard to find a set of 8 self alligning rockers.
With a 1.5 rocker the lift is .483/.520 and I was hoping to get the intake to a .515 (1.6) or a .531 (1.65) which means the exhaust goes to .555 (1.6).
I want to find a set of mixed 1.65 and 1.52 self alligning, but I'm not sure that'll happen.
There is always a limiting factor, assuming I can get the correct spring, it would be the length of the valve or the valve hitting the piston. I know the GM hotcam gets a .525 lift, but I'm not sure how much further I can go before I get into trouble with the stock heads and valves.
With a 1.5 rocker the lift is .483/.520 and I was hoping to get the intake to a .515 (1.6) or a .531 (1.65) which means the exhaust goes to .555 (1.6).
I want to find a set of mixed 1.65 and 1.52 self alligning, but I'm not sure that'll happen.
There is always a limiting factor, assuming I can get the correct spring, it would be the length of the valve or the valve hitting the piston. I know the GM hotcam gets a .525 lift, but I'm not sure how much further I can go before I get into trouble with the stock heads and valves.
01-29-2002, 11:45 AM
#6
Safety Car
Re: Max Valve lift on an LT1 Head (mn_vette)
Self alligning are a bad choice for a cam car setup. Talk to Comp and they will tell you on a car with anything more than an air filter, you want non-self alligning ones and use guideplates, 7/16" studs, and hardened pushrods.
If you want a set of these in split 1.5/1.6 ratios, let me know. I will break up a new set for you. Give me a ring this afternoon as I am on my way to the engine shop.
Thanks,
Chris
If you want a set of these in split 1.5/1.6 ratios, let me know. I will break up a new set for you. Give me a ring this afternoon as I am on my way to the engine shop.
Thanks,
Chris
01-29-2002, 10:38 PM
#7
Melting Slicks
Thread Starter
Re: Max Valve lift on an LT1 Head (Chris@SpeedDemon)
Thanks, like I have in my signature this is my first car, not to mention the first one that I would have ever thought of taking apart and making better. You guys are teaching me alot. I'm sure I'll post a few really dumb things before too long, but it's always a learning experience :D
