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Re: SBC 350 Engine Backfire Through Exhaust and Carb
very doubtful to have valves sticking on a fresh motor. Im thinking more along the lines of a cam starting to wipe out. Its really hard to sit here and guess. But to have a backfire both through the carb and out the exhaust its the most likely suspect. Just for giggles pull the distributor cap and make sure the mechanical advance is actually moving. I know you say your timing is 12 at idle but if you have a timing light capable of showing advance see what timing is at 3k rpm.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
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