454 help with popping
07-31-2010 | 11:11 AM
#11
Registered
Joined: Aug 2009
Posts: 80
Likes: 0
From: Meridian, MS
07-31-2010 | 11:55 AM
#12
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
Just Toasted A Brand New Engine Cause The Builder Seemingly Somehow Or Another Allowed One Of The Retainers On The Valve Spring To Fail. Lost The Entire Engine Over It With Mechanic On Board For Dialing In The Engine, Gues You Cant Get One To Stop Turning Quick Enough. Id Listen To The Elders On Here They Seem Knowledgable.
In the end he could have made a mistake but that statement has no basis and is more than likely not true.. Would need to know more facts.
I've seen retainers/locks or brand new valves fail and it had absolutely nothing to do with the "Builder".
08-16-2010 | 07:59 PM
#15
Registered
Joined: Jul 2004
Posts: 121
Likes: 0
From: Hobe Sound, FL
Same thing happened to me, exhaust valve lobe wiped off and it was a new cam with the break-in procedure by the book. GM's are known for wiping off cam lobes.
What I don't understand is rust in the cylinders. This leads me to believe you had a leaking riser gasket causing your exhaust valve stems to rust causing excessive load and wear on your cam. Think your problem all the way through before putting that boat in the water again. Can't tell ya how many times I thought I found the smoking gun when it really was just a symptom or resulting failure of another failure.
What I don't understand is rust in the cylinders. This leads me to believe you had a leaking riser gasket causing your exhaust valve stems to rust causing excessive load and wear on your cam. Think your problem all the way through before putting that boat in the water again. Can't tell ya how many times I thought I found the smoking gun when it really was just a symptom or resulting failure of another failure.
