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02-12-2013, 04:55 PM
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Registered User
 Join Date: Sep 2012
Location: Factory
Posts: 681
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Predetonation pinging and rattling
I am working with a friend on his truck. 350sbc with HEI from an '86 Blazer. We have it timed right at idle. However, when he gets up to speed (45+ mph) and is accellerating, the valves start rattling. I think he is geting predetonation from the vacuum advance. Could I be wrong? If I'm correct....what is the best way to adjust it? Not my wheelhouse.
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