First off thanks to everyone who replied to my last post. This is the same
engine as in my previous post (400 big block chrysler, not sure what
year). It has a non-stock cam (I don’t know the specs, it was installed by
a previous owner and the guy I bought it from didn’t know either), a
non-stock electronic ignition (once again previous owner)with no vaccuum
advance, and a non stock Holley 650 four barrel carb. The problem is that
it seems like there is more vibration than there should be at idle in gear
or in park, but it doesn’t seem to be misfiring and the cylinder
compression is normal. When I hit the throttle hard enough for the
secondaries to open, it backfires and belches fire out of the carb, then
proceeds to have no guts whatsoever. I ran some lucas fuel system cleaner
through it and changed the oil and spark plugs, bought a Holley Trickit
for the carb and rebuilt it because the secondary float needle was
sticking and the secondaries are now operating normally and are getting
fuel. I checked the compression in all cylinders and it was normal. The
distributor cap and rotor are in good shape and I just set the air gap. I
checked the timing and it was set at more than 30 degrees (!) before top
dead center, so I advanced it to 7 1/2 degrees before top dead center, and
it behaved the same only ran worse, like that was too much advance. It has
fresh fuel in it also. Starting to run out of ideas. If anyone could steer
me in the right direction, I would be grateful!
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