Rocker Arms
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
Rocker Arms
I was having a light tick coming from my LS7 on the right side. I took off the rocker arms and discovered that on of the rocker arms the needle pins were missing. Should I get the rocker arms repaired or just buy the yella terra rocker arms. I am also planning on changing the cam to .650 lift plus I run 16-18 pounds of boost. I'm afraid that the new springs I will be running are that rated up to .700 lift will put a lot of pressure on the rocker arms. I have also heard that the Yella Terra rocker arms are too heavy for the valve system on a LS7.Thanks
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Burning Brakes
Joined: Feb 2002
Posts: 1,154
Likes: 25
From: Jasper GA
I have a F1 and it has the biggest pulley that I can run to keep the boost down.
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
It maxed out the boost gauge and its rated to 15lb, plus the dyno showed it. Trust me my tuner does not like that much boost with a LS7. The motor was build by Texas Speed and Performance all forged.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
I am with you the biggest pulley and running 16to18 lb of boost something is wrong with your gauge. I dont see anyway. On the 427 bigger ci mean lower boost #...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
The dyno and the hp tuners showed it also. I have the older bigger intercooler. And when I had a 3.75 pulley on it I had 14lb of boost at 3500rpms.Maybe something is wrong with the other 427! I have the dyno sheets and data showing its at 16-18lbs. aske Dale from tack it up motorsports and Bluecat Tuning.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
The dyno and the hp tuners showed it also. I have the older bigger intercooler. And when I had a 3.75 pulley on it I had 14lb of boost at 3500rpms.Maybe something is wrong with the other 427! I have the dyno sheets and data showing its at 16-18lbs. aske Dale from tack it up motorsports and Bluecat Tuning.
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
I was there during all dyno pulls. I mean hey I was only wanting around 10 lbs of boost. But the pulley is a 4.7 and anything bigger hits the brackets. i have a 4 inch and a 3.7 inch pulley and never have used them.The rocker arms are bad so I going to replace them. I have read that this is normal with the LS7 because they are offset and bigger springs stress them. Just wanting to know what is better way to go, fix old ones or buy yella terra.
Advanced
Joined: Nov 2004
Posts: 85
Likes: 0
From: Millstone Twp. New Jersey
I was there during all dyno pulls. I mean hey I was only wanting around 10 lbs of boost. But the pulley is a 4.7 and anything bigger hits the brackets. i have a 4 inch and a 3.7 inch pulley and never have used them.The rocker arms are bad so I going to replace them. I have read that this is normal with the LS7 because they are offset and bigger springs stress them. Just wanting to know what is better way to go, fix old ones or buy yella terra.
Drifting
Joined: Jun 2008
Posts: 1,565
Likes: 111
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
I was there during all dyno pulls. I mean hey I was only wanting around 10 lbs of boost. But the pulley is a 4.7 and anything bigger hits the brackets. i have a 4 inch and a 3.7 inch pulley and never have used them.The rocker arms are bad so I going to replace them. I have read that this is normal with the LS7 because they are offset and bigger springs stress them. Just wanting to know what is better way to go, fix old ones or buy yella terra.
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
How did you check the boost gauge? I'm running a 3.75" pulley on a 429 and getting 14 psi with an F1R..... your boost readings seem off......just doesn't make sense with an F1. Your just not spinning the F1 hard enough to make 18 psi.
Last edited by HIGHRPM; Dec 20, 2010 at 11:07 AM.
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
That sounds just right.....when I ran a 4.10" I got 11 psi.
Last edited by HIGHRPM; Dec 20, 2010 at 11:14 AM.
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 885
Likes: 0
From: Point Pleasant wv
The old fashion way, took a old valve used some fittings.Took manual tire pump put gauge at 15psi and the checked it with tie gauge. tire gauge was at 15psi.I used to check my other cars that way and the were correct.
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
Still, that doesn't account for the fact that your not spinning the F1 fast enough to make 18 psi...... its just not physically possible. Your running a pulley that's over 20% smaller and your saying it somehow makes over 20% more boost than a 3.75" pulley on the same size motor. What rwhp/rwtq numbers are you seeing. Please post the dyno chart that shows boost levels vs power levels.
