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Old 05-14-2012, 07:31 PM
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uh oh.....

Help.... A valve spring broke while i was revving the engine. Immediately it started making a knocking sound. Seemed to be coming from the top under the valve cover. I replaced the valve spring but only with a smaller stock spring just to see if the engine would crank until i could get a correct spring. The engine cranked but still has a loud knocking. The valve wont push down or come up. Seems to be stuck. Whats next ?
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Old 05-14-2012, 07:38 PM
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At the very least, that cylinder head must come off. You have bent a valve. I would pull both heads and have a new set of springs put in.
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Old 05-14-2012, 07:43 PM
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a complete valve job ?
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Old 05-15-2012, 07:30 AM
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Quote:
Originally Posted by 47Coop
a complete valve job ?
Hopefully the piston is not damaged and that's all you'll need...

Russ
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Old 05-15-2012, 08:44 AM
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don't rev the motor so high. next time
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Old 05-15-2012, 04:07 PM
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Quote:
Originally Posted by lg1969
don't rev the motor so high. next time
wasnt hammering down on it but just enough to trash a crystalized spring. This 64 vette had been sitting for years. I put a starter on it , cleaned the tank, done a lot to it but never checked the springs. Turns out they all have crystalized. Just a matter of time before another broke.

its a 400 bored .30
502 lift @.05
trick flow 67cc heads
forged steel 350 crank and rods
balanced and blueprinted , 4 speed muncie. I know a 502 lift isnt as high as it could be but with crystalized springs , they gonna break, but thanks for the input.
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