yes this is a serious question...
Originally Posted by schultzsj
Quoted lift on cams is given at the valve with the stock rocker ratio. If .591 is the correct lift for the LS7 that means the springs are being compressed that much each cycle.
So, back to the question, how is GM getting 100k+ miles on springs that are being cycled .591" (assuming this is the correct lift)?
Steve
So, back to the question, how is GM getting 100k+ miles on springs that are being cycled .591" (assuming this is the correct lift)?
Steve 
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Why do you all assume that .591 lifts mean fast lobes.
to answer your question properly:
1- find .006 lifts
1- find .050 lifts
this will give the variance in rate. You'll find that the lobes are not that steep.
to answer your question properly:
1- find .006 lifts
1- find .050 lifts
this will give the variance in rate. You'll find that the lobes are not that steep.
Staging Lane
Joined: Sep 2003
Posts: 93
Likes: 0
Originally Posted by ta_silver_bullet
if that is the lift on that cam i dont see it getting 100k mile son the springs. i dont know how they would when aftermarket springs that are made to hold that much will not last anywheer near that long. i havnt heard anything on maintanace schedule on the c6 zo6 yet does anyone have this info it would be interesting to see what gm has said about it
They just have to last 36k miles.
I doubt that the ls7 springs are going to be the same size as a drop in ls1 spring. Increase the spring diameter and possibly its installed height and now that .591 lift isnt so big anymore. Since the ls7 heads arent similar to any other gen3 and gen4 heads, nothing holds GM to using the same size springs. This is just an idea. I dont know that actual specs. Please correct me if they are actually using the same size springs.
