My '58 GMC has a 350 with a Turbo 350 trans in it. This is the engine that was in the vehicle when I bought it.
It has always run rough. Not real rough but kind of like it wasn't firing on one cylinder. It is especially noticeable when I drop it in gear. I'm getting a little bit of smoke (not black, maybe gray) out of both sides of exhaust. The plugs are black and sooty. No unusual noises knocks, or clatter. No bubbles in radiator or milky oil. When starting, it fires right up no problem.
Here are the specs:
The engine is early 70's SBC 350 ('72 if I recall correctly)
Mileage is unknown but I would imagine it's got quite a few on it.
Intake is an Edelbrock performer.
Carb is Holley R84010 w/ manual choke, part of the 4010 series, I guess.
Here is what I have done so far:
Replaced the points distributor with an aftermarket HEI - no change
Replaced the plugs and ignition wires - no change - plugs are sooty.
Check firing order - it is correct.
Timing is OK.
Removed and reinstalled intake with fresh gaskets. - no change
Sprayed carb cleaner around base of carb while running - no change.
Run compression check as follows:
#1- 150
#2- 130
#3- 142
#4- 150
#5- 150
#6- 130
#7- 150
#8- 150
Engine has a PCV valve on one valve cover. Other valve cover has a straight line running to a fitting on the air cleaner. Vacuum advance line running to distributor is OK. There are no open vacuum fittings.
Any ideas? I'm out of 'em.
Last edited by Old Gold; 07/20/2008 7:33 PM.
