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post #1 of (permalink) Old 05-25-2002, 11:02 PM
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CJ - REbuilding 304, advance the timing?

im rebuilding my 304, and if im not mistaken, the timing is retarded 4 degrees from the factory. i am thinking about advancing it that 4 degrees when i dial in my cam. are there any bad things that could result from doing this? and how much power might i gain from this ? -- Andy
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post #2 of (permalink) Old 05-26-2002, 09:24 AM
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Re: CJ - REbuilding 304, advance the timing?

Ok, very good question. Quite often there is confusion between spark timing and valve train timing / camshaft timing. You seen to have a good idea that what your wanting to do is advance the valve train timing / camshaft timing. The short version explaination of advancing the valve train timing / camshaft timing will shift the torque and horsepower performance to a slightly lower RPM. For example if the 304 has the camshaft installed to factory specs, and for example the let's say the the max torque is 310 Ft. Lbs @ 3800 RPM's and max horsepower is 265 at 4200 RPM's. Then let's say for example the valve train timing / camshaft timing is adavanced by 4 degrees a typical shift in performance would have still have the max torque at 310 Ft. Lbs @ but lowered to 3500 RPM's and the max horsepower would still be 265 but lowered to 3900 RPM's. I'm not an expert with the AMC 304, I more a Chevy 350 expert. Quite often, I'll install a Chevy 350 camshaft plus 2 degrees for pickup engines that usually do towing or mild 4X4 off-road use.
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post #3 of (permalink) Old 05-26-2002, 01:57 PM
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Re: CJ - REbuilding 304, advance the timing?

thanks dave, that was very helpful. so advancing the timing doesnt actually give you more power, just gives you the power when you need it, that makes sense. i was considering going with a 350/TH350 setup, but the adapter for the th350 to the dana 300 is 580 bucks! ouch. so im gonna stick with the 304 for now
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