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Re: Big Block - possible timing issue (?)
If it had SMOG equipment like the AIR pump, I trust that it is not there? Those things pumped air into the exhaust to further oxidize it while cold, and sometimes caused some noise. Otherwise, I would accuse lean mixture. Do you have a choke, set up properly?
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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