My '67 435 coupe runs like crap.
It doesn't want to idle and hard to crank hot, despite the fact that the carbs were built by Holley's custom shop (then shelved dry for several years before running). We freshened the engine last year with pistons, camshaft, lifters, heads done, etc, etc. It runs about the same now as before.............. like crap. Oh yeah, trans ign. re installed in car after previous owner had substituted points/condensor for fix for dead ignition box, so ignition virtually eliminated.
I'm putting a NEW in the box set of carbs on it that I've had in my parts stash for 10 yrs or better, but when pulling the carbs I noticed that the front two holes under the front carb are black and sooty. Side note: I've never cracked the secondaries since the motor has been back in the car, and it's been driven less than 50 miles.
What does the blackness under the front carb mean. Compression seems about even on all cyls. One other thing, sometimes when hot, engine labors on starter, much like extremely high timing, with a loping cranking cycle that clears after several revolutions. This would almost seem to indicate fuel in a cyl, like maybe a leaking needle/seat, but replacing all 3 and resetting float levels with car running didn't do anything to help symptoms.
Is it possible that some internal leak somewhere in the front carb is making it go real rich in some way that's not noticeable after cutting off and looking down in the throats? The plugs look VERY rich, but the way the car has been idled around and cranked and shut off a good bit foolin' with carbs, that's no surprise.
Ironcially, this is a kind of situation that I'd probably try and venture some answers on if somebody else posted it, but this one has got me past my point of patience. I've done the carbs myself on my '69's several times over the years with never a similar issue.
It doesn't want to idle and hard to crank hot, despite the fact that the carbs were built by Holley's custom shop (then shelved dry for several years before running). We freshened the engine last year with pistons, camshaft, lifters, heads done, etc, etc. It runs about the same now as before.............. like crap. Oh yeah, trans ign. re installed in car after previous owner had substituted points/condensor for fix for dead ignition box, so ignition virtually eliminated.
I'm putting a NEW in the box set of carbs on it that I've had in my parts stash for 10 yrs or better, but when pulling the carbs I noticed that the front two holes under the front carb are black and sooty. Side note: I've never cracked the secondaries since the motor has been back in the car, and it's been driven less than 50 miles.
What does the blackness under the front carb mean. Compression seems about even on all cyls. One other thing, sometimes when hot, engine labors on starter, much like extremely high timing, with a loping cranking cycle that clears after several revolutions. This would almost seem to indicate fuel in a cyl, like maybe a leaking needle/seat, but replacing all 3 and resetting float levels with car running didn't do anything to help symptoms.
Is it possible that some internal leak somewhere in the front carb is making it go real rich in some way that's not noticeable after cutting off and looking down in the throats? The plugs look VERY rich, but the way the car has been idled around and cranked and shut off a good bit foolin' with carbs, that's no surprise.
Ironcially, this is a kind of situation that I'd probably try and venture some answers on if somebody else posted it, but this one has got me past my point of patience. I've done the carbs myself on my '69's several times over the years with never a similar issue.
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