The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - easy way to figure cam lift on sbc in truck? worried changing heads

cableguy0 · 07-24-2010, 03:42 PM

Theres no reason it should be pinging at 8 degrees advanced much less 6. Your going to need to verify that your timing marks are proper and the balancer hasnt slipped. have you checked the fuel filters? The quick thing to do to find out if its pinging is to just try higher octane fuel. Are you sure the heads on it now arent 305 heads? If the engine is unknown to you its hard to give you an accurate diagnosis without knowing more. Compression could be too high causing the pinging. Try 93 octane fuel and go from there. if the noise goes away you found your problem.

07-24-2010, 03:42 PM	#10
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: easy way to figure cam lift on sbc in truck? worried changing heads Theres no reason it should be pinging at 8 degrees advanced much less 6. Your going to need to verify that your timing marks are proper and the balancer hasnt slipped. have you checked the fuel filters? The quick thing to do to find out if its pinging is to just try higher octane fuel. Are you sure the heads on it now arent 305 heads? If the engine is unknown to you its hard to give you an accurate diagnosis without knowing more. Compression could be too high causing the pinging. Try 93 octane fuel and go from there. if the noise goes away you found your problem. __________________ 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.