Re: Need ignition upgrade help/advice.
Jake, did you ever get a chance to put those new intake gaskets on? Lightly buff the surfaces? Also did you reseal the valley pan?
351 power specs are: 180 hp @ 3400 and 312 pound ft @ 1800-2000 gross
351E power specs are: 220 hp @ 4000 and 320 pound ft @ 1600 gross
So not a Ton of power to begin with but plenty of torque to haul that thing at a decent speed. Specs are 4-6 degrees advanced so if you had to add an extra 5 degrees advance just to make it run decently I have to wonder if the timing jumped? The chains on these are not very tight so that could be a possibility. I haven't read of it happening yet, but there's always a first time.
Vacuum leak already mentioned.....check all gaskets and hoses.
When you did the carb rebuild did you check to see if the throttle shafts in the carb were all worn out? Vacuum leak through there will cause backfiring and power loss.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
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Last edited by TJ's GMC; August 4th, 2017 at 06:36 AM.
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