Mr Powell

iTrader: (1)

Did you install shims under the rocker mounts, that long peice you bolt your rockers to? If so or if not.. What is the lift on your cam. Also if you know your installed spring height let me know.

427

iTrader: (3)

I have never had to shim under the stand on a gen 3. I did one time need to machine the head to lower the stand. Your kit should have a tool for checking stand height. It would be a 5/8 piece of alum dowel and a strange looking alum arm with a hole in it. Just follow the instructions on setting up the stand height, its different on each head based on valve length. The lift on the cam has very little to do with the base stand height. If you use jesel instructions and your cam lift is between .600-.800 it will get you very close on geometry.
Kurt

Mr Powell

iTrader: (1)

Thats the weird thing. I've broken 3 rocker arms now in the exact same spot (along the cup on the adjuster). 2 broke while the car was running. 1 Broke while we were putting them back on. MTI says someone else touched it thats why they broke, but the first one that broke happened 4 days after I left their shop and the valve covers had never been off the car. The previous owner never had any problems, but he also did not beat on the car as hard.

Mr Powell

iTrader: (1)

The install height on my spring is 1.880"

427

iTrader: (3)

Make sure your not going into coilbind at full lift. Has it broke intake and ex rockers? How old are the valvesprings? What rpm do you turn it?
Kurt

Mr Powell

iTrader: (1)

It breaks the intakes when its running. The springs are about a year old and have about 3k miles on them. I barely spin it up at 6800-7000

427

iTrader: (3)

What valve springs are you running? What is the lift at the valve? Are they fixed or adjustable rockers?
It is either hitting coilbind or valvesprings are to soft for your application. I have ran those rockers in the 24 hour daytona race without problems.
Kurt

Mr Powell

iTrader: (1)

Yeah even Jesel is not sure why they are breaking. Here is all the info I have.

Springs - Comp Cams - #927-16
Retainers - Comp Cams - #721-16
Locators - Comp Cams - #4778-16

Installed height 1.880
Coil bind 1.140

Seat pressure 250 lbs

Open pressure 600 lbs

Springs were .070 from coil bind at max lift

Valve lash is .016" on the intake and .018" on the exhaust.

Mr Powell

iTrader: (1)

These are fully adjustable. They have LSW70 under the rocker arm. The car is a Solid Roller car with a 260/266 with .675" of lift on a 112lsa.

427

iTrader: (3)

That spring has a coilbind listed at 1.175. Add that to your lift @.675= 1.85. Add a min clearance of .060equals min set up 1.91. 1.88 is to tight.
Kurt

FASTONE

How much room between retainer and valveseal,have you checked rocker motion from 0 to full lift? I mean to check pushrod lenth and contact path on top of valve?