Our first Isky 295D failure
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
Our first Isky 295D failure #5 intake springs broke in multiple locations and also destroyed the fulcrum on the rocker. Good news is, no leaking, so the valve is fine. We will likely replace these with Manley springs, seats, retainers, and locks.
Lift on the intake side for this cam is .635, and these were the "tool room gold" springs. We have abused many of them, but this is our first failure.
Lift on the intake side for this cam is .635, and these were the "tool room gold" springs. We have abused many of them, but this is our first failure.
TECH Fanatic
Joined: Mar 2003
Posts: 1,112
Likes: 0
From: Dallas
Originally Posted by Reckless
We will likely replace these with Manley springs, seats, retainers, and locks.
15K here, .563 lift. No races, daily driver. Haven't checked the valve or rocker yet but the retainer is beat to hell, and it along with the locks were way at the front of the head; I broke #3 intake in 4 pieces a week ago. Sorry to hear.
Trending Topics
Originally Posted by Reckless
#5 intake springs broke in multiple locations and also destroyed the fulcrum on the rocker. Good news is, no leaking, so the valve is fine. We will likely replace these with Manley springs, seats, retainers, and locks.
Lift on the intake side for this cam is .635, and these were the "tool room gold" springs. We have abused many of them, but this is our first failure.
Lift on the intake side for this cam is .635, and these were the "tool room gold" springs. We have abused many of them, but this is our first failure.
0 passes at the track
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo From everything I've read, that spring held up well. Everyone always says to swap at a 10k-15k interval on a high lift, fast ramp cam. Do you think the Patriots or Manleys will last longer?
I think the Patriots will last longer. I was told by tsp that with my cam i should see 30-35k out of them, but I that I should check them around 15k. Sounds good to me! Note, I told them my car won't see much track use, so if you go to the track often, the life will be shortened.
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
The heads were of the car just a few weeks ago and the valve springs were checked out be our head porter. He was happy to report the springs had only lost about 5 pounds of pressure. Guess that was 5 pounds too much 
Sorry to hear about the car Dean. You back from the sandbox now I presume?
Sorry to hear about the car Dean. You back from the sandbox now I presume?
Originally Posted by Reckless
The heads were of the car just a few weeks ago and the valve springs were checked out be our head porter. He was happy to report the springs had only lost about 5 pounds of pressure. Guess that was 5 pounds too much
Sorry to hear about the car Dean. You back from the sandbox now I presume?
Sorry to hear about the car Dean. You back from the sandbox now I presume?
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
Dean and I know each other from Hawaii. He was at Schofield flying choppers and I was at Hickam. Used to hang out there together sometimes. I am retired from the USAF now.
Me too,had one cut through a COMP retainer and drop a valve, so I replaced them all, ISKY locks,seats,and retainers too and after 13000 relatively easy miles one broke and another was about to go,valve kissed a piston but not bad.I was so pissed I sold the heads and got AFRs w/patriot double golds.We shall see.
Originally Posted by kumar75150
about 15-20k of which there were prolly about 100 race passes
Id say they held up well knowing Kumars driving 
Mike
Originally Posted by luv2spd
I think the Patriots will last longer. I was told by tsp that with my cam i should see 30-35k out of them, but I that I should check them around 15k. Sounds good to me! Note, I told them my car won't see much track use, so if you go to the track often, the life will be shortened.
Mike
