350 problems

Joshua McMeans

Asked by Jul 15, 2016 at 07:50 PM about the 1979 Chevrolet C10

Question type: Maintenance & Repair

My friend put a 350 in a 79 truck with mild cam,
Holley intake, msd ignition system, but still has a
older style carb. Has oils in 4 spark plug cylinders
will not start with out pouring gas in the carb it
smokes and coughs out of the carb and has no
power can some one tell me what's wrong or what
needs to be done to fix

7 Answers


Is your PCV hooked up and really bad? Oil can get in through that and getting mixed in the air-fuel mixture? Could be what's causing the rough running and lack of power too. Then again worst case scenario you have bad rings or bad valve stems/guides. You'll have to do a little tear down to find the culprit.


Forgot to mention, a leak-down test can be a big help in your case, if you suspect rings or valves.


First of all you need to stop that oil for getting on those four plugs and that sounds like it needs piston rings as long as oil is getting on those plugs she is going to continue to smoke and cough.

Joshua McMeans

No pcv I think it's rings but it acts like it's not getting enough fuel if it's the rings would it just need a new motor it's not new it's used


A new motor would do it or just rebuild that one.


You can do a dry compression test then a wet compression test, that generally will indicate bad rings. mid-late 70's trucks are getting more popular, so maybe it's time to do a mild rebuild on this engine?

Bob Beaman

How long since this engine was last run?

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