BBC tuning question?

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04-27-2009, 03:32 PM

whitey70ss

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BBC tuning question?

A friend of mine has a bbc in a jet boat the engine idles fine but as soon as you bring it of idle it starts popping through the exhaust. I tried moving the distributer to the left and it got worse so I tried to the right = worse. I'm wondering if its in the carb its a marine style holley p/n R84018-2 Any suggestions would be helpfull. Thanks

04-27-2009, 03:48 PM

fatjodycat

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im thinking rounded lobe on cam.

04-27-2009, 06:45 PM

TS1955

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Broken or weak valve spring(s).

TS1955

04-27-2009, 09:38 PM

russ67chevelle

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running lean???

04-27-2009, 10:43 PM

Tod74

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Re: BBC tuning question?

Quote:

Originally Posted by whitey70ss

why not put a light on it...time it correctly and stop moving it? That would eliminate that variable. Not being a smart alek just a suggestion.

04-27-2009, 10:46 PM

cepx111

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I'd pull the valve covers and do a looky loo.

He's probably got a broken valve spring, broken rocker arm or pushrod not on the rocker arm, been there done that, I hate that sound.