Drivability Issues. Its a slug that doesnt want to shift
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
It runs very well now
Try using a bump stop/piston stop to confirm top dead center - you could be way off on the timing. Are you able to observe the mechanical advance with the timing light? If you are at 12 at idle how much does it increase to at 3500 RPM? How much mechanical advance do you have with the HEI style. With a beat up 2 barrel and good timing my 390/C6 ran great with plenty of power so you have the potential - just some issues. A pertronix unit is very sensitive to the gap between the rotor and the pickup. Check your gap and then try to wobble the distributor shaft side to side. If you can move it, the bushings are shot and the Pertronix will struggle due to the varying gap.
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
Its running well now
I'm not saying that this is your problem but I have seen several of these old FE intakes where the exhaust crossover burns through due to a stuck heat riser. This creates a hidden vacuum leak inside the intake that you can't see and does not show when spraying around the outside.
Just something to think about if you fix everything else and still are having low vacuum.
Just something to think about if you fix everything else and still are having low vacuum.
FTE Legend
Joined: Nov 2015
Posts: 30,906
Likes: 4,122
From: Angier, NC
Good to hear you got it running again and from the sound of it better than it had been.
Maybe the Pertroix unit was going bad?
On the vacuum advance I dont think its that hard to replace if the are is on top of theplate.
2 screws that hold the can to the dist. and remove a clip holding the arm to the plate stud.
Just watch out for that clip.
Dave ----
Maybe the Pertroix unit was going bad?
On the vacuum advance I dont think its that hard to replace if the are is on top of theplate.
2 screws that hold the can to the dist. and remove a clip holding the arm to the plate stud.
Just watch out for that clip.
Dave ----
Thread Starter
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Laughing Gas
Joined: Nov 2015
Posts: 950
Likes: 73
From: San Diego
Pertronix said it either works or it doesnt its a "switch"
Good to hear you got it running again and from the sound of it better than it had been.
Maybe the Pertroix unit was going bad?
On the vacuum advance I dont think its that hard to replace if the are is on top of theplate.
2 screws that hold the can to the dist. and remove a clip holding the arm to the plate stud.
Just watch out for that clip.
Dave ----
Maybe the Pertroix unit was going bad?
On the vacuum advance I dont think its that hard to replace if the are is on top of theplate.
2 screws that hold the can to the dist. and remove a clip holding the arm to the plate stud.
Just watch out for that clip.
Dave ----
.Either way its running so well now. There IS still a little hesitation on accel from a stop that I can reproduce while manually operating the carb linkage. This hesitation IS the accelerator pump. I can lightly manipulate the accelerator pump arm and stop the hesitation. My carb linkage is sticky from what looks like old grease so I will be cleaning it and spraying a lubricant on it. To see if I can get this little issue cleared up and make the linkage operate more freely..
Im deciding if I want to go with an entire rebuilt distributor. The vacuum advance is $30 by it self. Its $70 for a complete rebuilt distributor that of course includes the vacuum advance.
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