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Re: If you like destruction -
I had a 454 that a local machine shop did a valve job for me and within 50 miles it did that to one cylinder. It dropped a valve and beat up the spark plug before I got it shut off. It also scored the cylinder so bad I had to sleeve it. The machine shop tried to tell me it was due to a broken guide but I'm sure they had some kid doing assembly and he didn't get the keepers seated right
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69 Chevy 4x4 383 Power 
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