My 67 Camaro has had a horrible exhaust stink for awhile now. It's bad
enough that just starting it up and pulling it out of the garage is enough
to make you sick to your stomach, make your eyes water, and stink up your
clothes until they're washed again. It's so strong that my wife complains
about the exhaust smell when I walk in the door, you get the picture. Odd
thing is it runs GREAT! Plenty of acceleration, no bogging, not a complaint
in the world performance-wise, it just smells bad, REALLY bad.
Last year I rebuilt the motor thinking the rings were shot (which they
were), but that didn't change anything as far as the stink goes. I recently
replaced the stock points ignition w/ a Unilite, Powermaster coil, and
HyFire box. Still no change. Just replaced the fuel pump this weekend,
again no change, maybe worse? It's a more or less a stock motor with
headers and a 272H Crane cam. I don't have much knowledge about the old
Q-Jets, and I'm sure with the right know-how it would be an easy fix.
If anyone can lend some advice on tuning a Quadrajet (4MV) for less stink,
or what to look for, it would be greatly appreciated! I've considered one
of Edelbrock's Q-Jet units, but I'd rather save my money since I'm sure it's
a simple fix, considering it runs so good right now with the old carb. I've
considered a carb swap too (square-bore), but don't want to make that change
if there's not a good reason to do so.
PS: I've already checked the operation of the choke and it's fine. It's the
style that runs off the heat from the intake. Starts choked when it's cold,
then opens up after running for a couple minutes.