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The oil leak is probably comming from the top of the oil pan there is a rubber gasket that goes between the oil pan and the water pumb which would make it look like its comming from the harmonic balancer, try replacing the oil pan gasket this should fix the problem.
New answer: There is a small round oil seal / Harmonic balancer seal that fits in the timing cover and the balancer slides through the center of it. That is probley were your oil leak is. Most of the time the balancer itself gets a groove wore in it over time from that rubber seal running on it. You can repair the balancer by buying a Harmonic balancer repair sleeve/ speedy seal. Also replace the front timing cover seal.
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What size is a 350 Chevrolet harmonic balancer?
It should be 8 inch
Chevrolet 350 harmonic balancer bolt torque?
60 ft-lbs
How can i tell the difference between a Chevrolet 350Ci and a Chevrolet 305Ci 1986 in my C10 pickup?
the harmonic balancer on the 350 is about 10 inches in diameter compared to a 305 it has about 8 inch diameter on the harmonic balancer
Are the threads left or right hand for the harmonic balancer on 1974 Chevrolet Corvette 350 engine?
Those are right-hand threads.
Did they make a 8 inch harmonic balancer on a 1978 Chevrolet 350?
Yes they sure did. It could be a 4-bolt main engine.
What is the bottom pulley on a Chevrolet 350?
The "bottom" pulley is typically the one that is driven off the crankshaft. It's called the "harmonic balancer".
Will a 350 harmonic balancer work on a 4.3L V6 and if not why?
Not recommended.
Will a Chevy 305 harmonic balancer work on a 350 motor?
yes
Is the harmonic balancer the same for an 85 and 86 Chevy 350?
yes.
Can a 350 v8 harmonic balancer be used on 4.3 vortec v6?
NO.
Can you use a harmonic balancer off a Chevy 350 on a Chevy 307?
Yes.
Can you use a 305 Sm block harmonic balancer on a 350 Sm block?
Yes.
