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454 ci engine with heads rebuilt. On cold start up the oil…

Customer Question
454 ci engine with...

454 ci engine with heads rebuilt. On cold start up the oil pressure is btw 35-40. When it warms up it drops to 20# ***** oil smoke comes out of exhaust. Took off intake and replaced valley pan gasket - still does the same thing.

Mechanic's Assistant: How old is your oil pump? Has the check engine light come on?

Oil pump is a few years old. The car is a 76 Pontiac LeMans. Not OBD II

Mechanic's Assistant: Are you fixing your Lemans yourself? What have you tried so far?

Yes. Had the heads rebuilt at machine shop and re-installed, then problem started.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Replaced PCV valve, just to eliminate that as a potential problem.

Submitted: 10 months ago.Category: Pontiac
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Answered in 9 minutes by:
9/30/2017
Pontiac Mechanic: Classic Car Service, Dealership Svc. Mgr. replied 10 months ago
Classic Car Service
Classic Car Service, Dealership Svc. Mgr.
Category: Pontiac
Satisfied Customers: 5,239
Experience: Over 30 years experience in the automotive field
Verified

Hello. Welcome to Just Answer. Please allow me to assist you. Your oil pressure seems to be OK and is not the issue. What I think you have going on here is what was done with the heads. I am inclined to think that the valve seals are incorrect, or were forgotten on the reassemble, or, the valve guides are too wide. Anytime you get oil into the engine (and out the tailpipe) is either form poor oil control form the piston rings, or, the valve stems/guides/seals. I would recommend contacting your machine shop and advise them of this issue. Either that sized the valve seals wrong, omitted them, or, valve/valve guide work (if done) needs to be re-attended to. I trust my input is satisfactory and address your request properly. Please advise if this is so. Thank you in advance.

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Pontiac Mechanic: Classic Car Service, Dealership Svc. Mgr. replied 10 months ago

If you have any questions, please feel free to reply. Please do take a moment to confirm you have received my assistance on your request. Thanks!

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