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Discussion Starter · #1 ·
Ok so i dont see any leaks running alittle rough dont see smoke but i am losing oil almost a quart in less then 500 miles Its a 73 350. Dont think anything has been done to it. What do u think time to rebuild?
 

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If the rear crank seal leaks a bit, you may not notice it coming from the bottom cover on bottom of the flywheel/flexplate, when running down the road. High mileage engines usually lose oil through worn valve guides and valve stem seals.
A new/rebuilt long block from a rebuilder would be less money than what you can rebuild it for yourself, and new long blocks are out there for a decent price too, like from Jegs etc..
 

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If the modulator is bad the engine will suck transmission fluid but the modulator can't suck oil from the engine.
 

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Ok so i dont see any leaks running alittle rough dont see smoke but i am losing oil almost a quart in less then 500 miles Its a 73 350. Dont think anything has been done to it. What do u think time to rebuild?
A quart in less than 500 miles and you're not seeing any blue smoke?

Its leaking out somewhere. Wash the complete engine, go drive it and then inspect.
 
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Discussion Starter · #9 ·
I did the cleaning and cant find a leak when modulator is bad u get lots of white smoke
Think i am just going to rebuild it also it still has all the smog stuff on it. If that makes a difference
 

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Pop off the engine/transmission inspection cover and then fire up the engine. The oil may be leaking from the rear main and puddling up in the cover, then when you drive it seeps out through the little drain hole.

I would also check your distributor. Many forget to replace the distributor to intake seal, and oil WILL leak from there. Maybe your dizzy is loose, causing oil seepage and rough running?
 
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Discussion Starter · #14 ·
well put it in the garage to get to pull the motor and there is oil on the floor ----so i guess this was a good idea
 
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Discussion Starter · #15 ·
well sent the motor in the have it inspected and one of the heads had a crack in it ----so found where the oil was going -- so mystery solved ---should have it back this week finish cleanand painting the engine bay and move on from there
 
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