look what happened
Thread Starter
Safety Car
Joined: Sep 2006
Posts: 3,548
Likes: 138
look what happened
Had a valve job done before I put the motor back together. The guy I use is A#1. Bent a push rod first time out. changed it,no problem. Took it out Sunday to get Gas got on it started to miss.Same push rod bent. Pulled head,here's what I found. When they did the Valve job,the stem has 2 burrs in it,when it was cold it was ok.When it warmed up hung up in the guide,this is the result.He has retired since then,so I have to grin and bear it. Almost back together.This is one of the reasons I like to do all the work myself!!!
Last edited by prestige6; Mar 29, 2011 at 09:48 PM.
Race Director
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From: Canada's capital
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One of the first things I learned when putting motors together was to first cycle the assembly by hand through a complete revolution of all cylinders, before putting gas and a match to it. So many things can be caught if you do! 
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
i have seen this in the past when the stem to guide clearance is actually too tight on a new build from the start and that in turn would cause the burring which ultimately seizes the valve and it plays kissy face with a piston........
are you buying new heads or repairing what you have??.....
are you buying new heads or repairing what you have??.....
Thread Starter
Safety Car
Joined: Sep 2006
Posts: 3,548
Likes: 138
Almost back together,should be up and running by the weekend.....
Back together and all is good. Put around 25 miles on it,Got on it a bunch of times no problems.runs and purrs like a Tiger..
Back together and all is good. Put around 25 miles on it,Got on it a bunch of times no problems.runs and purrs like a Tiger..
Last edited by prestige6; Apr 3, 2011 at 10:29 PM.
Melting Slicks
Joined: Apr 2005
Posts: 2,777
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Exactly! especially with a high performance high lift cam. I put a thin layer of clay on top of each piston dome - then positioned the heads on the block, tightened the head bolts and hand cranked the motor over - then removed the heads after to see the clearances between each valve an piston. No Surprises and no failures.
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
Exactly! especially with a high performance high lift cam. I put a thin layer of clay on top of each piston dome - then positioned the heads on the block, tightened the head bolts and hand cranked the motor over - then removed the heads after to see the clearances between each valve an piston. No Surprises and no failures.
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Race Director
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hehehe!
Le Mans Master
Joined: Nov 2008
Posts: 5,691
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From: columbus oh
but yeah, youre right , it's all about being careful and using the proper stem to guide clearances especially on the exhaust valves........
Race Director
Joined: Mar 2009
Posts: 19,777
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From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
Thread Starter
Safety Car
Joined: Sep 2006
Posts: 3,548
Likes: 138