1987 K10 with a 350,120,000 miles, smoke on start up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 09-20-2020, 09:46 PM

It’s been puffing a bit of white smoke on cold start up and I’d like it fixed. Original 350 TBI with 120,000 original miles.

Need some help, I’ve decided to pull the intake and change the gasket and change the valve stem seals. Anything special I need to know? I’ll do a compression test first. Any special seals y’all recommend
Thank you for any help

**truckster** · 09-21-2020, 11:57 AM

I think you're on the right track. I like FelPro for seals and gaskets. The teflon seals seem to last longer.

**57NAPCO** · 09-21-2020, 05:02 PM

Decided to pull the engine and have it rebuilt.

vince1 · 09-21-2020, 06:43 PM

https://www.rockauto.com/en/catalog/...stem+seal,5800

Just in case you change your mind I put in a link to Rockauto for seals that might fit your engine.
For my 350 overhaul I used the orange with the spring around the top but the blue look pretty good too. In the early eighties I put new black rubber type umbrella seals in an engine. Thirty years later they were all in crumbs at the bottom of the oil pan and plugging the oil screen.

**57NAPCO** · 09-22-2020, 10:14 AM

Thanks Vince, after much consideration I’ve decided to pull it and have it rebuilt locally here in Maine. This engine is a son of a gun to get out and I’m no stranger to pulling these things. After 7 hours it’s still not out...maybe time to lock my tool chest and take up knitting.

**57NAPCO** · 09-22-2020, 09:00 PM

Glad I changed my mind, this looks like a mess. ( I’ve only put about 6000 miles on it, honest)

**truckster** · 09-22-2020, 09:31 PM

Yeah, I think once you pulled those valve covers you would have made that decision anyway. That one looks like it needs some love.

**AussieinNC** · 09-23-2020, 07:49 AM

Quote:

Originally Posted by 57NAPCO

Glad I changed my mind, this looks like a mess. ( I’ve only put about 6000 miles on it, honest)

What oil were you using? I have seen cleaner 200,000 miles engines than that one...WOW.

cadillac_al · 09-23-2020, 08:07 AM

I have only seen a couple engines in my life that were that sludgy. Those were high mileage no maintenance engines. Your engine has some kind of big problems. You're not one of those cold thermostat guys are you?

**57NAPCO** · 09-24-2020, 06:41 AM

I’ve only owned it for about 3 years, 6000 miles. Changed oil once under my ownership. Never overheated on me. Dropped it off yesterday with the engine builder.

**tdangle** · 10-02-2020, 12:14 PM

I had an engine once like that. Pulled it out of a 73 Monte Carlo. Cleaned all the crude up in the oil pan and valleys and put it back in. Seemed to run just fine. (was to broke to rebuild at the time) Figured the PO never changed the oil.

**57NAPCO** · 10-05-2020, 08:43 AM

Picked up my short block, bored 30 over.

09-20-2020, 09:46 PM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	1987 K10 with a 350,120,000 miles, smoke on start up It’s been puffing a bit of white smoke on cold start up and I’d like it fixed. Original 350 TBI with 120,000 original miles. Need some help, I’ve decided to pull the intake and change the gasket and change the valve stem seals. Anything special I need to know? I’ll do a compression test first. Any special seals y’all recommend Thank you for any help

09-21-2020, 11:57 AM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,795	Re: 1987 K10 with a 350,120,000 miles, smoke on start up I think you're on the right track. I like FelPro for seals and gaskets. The teflon seals seem to last longer. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

09-21-2020, 05:02 PM	#3
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1987 K10 with a 350,120,000 miles, smoke on start up Decided to pull the engine and have it rebuilt.

09-21-2020, 06:43 PM	#4
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,164	Re: 1987 K10 with a 350,120,000 miles, smoke on start up https://www.rockauto.com/en/catalog/...stem+seal,5800 Just in case you change your mind I put in a link to Rockauto for seals that might fit your engine. For my 350 overhaul I used the orange with the spring around the top but the blue look pretty good too. In the early eighties I put new black rubber type umbrella seals in an engine. Thirty years later they were all in crumbs at the bottom of the oil pan and plugging the oil screen.

09-22-2020, 10:14 AM	#5
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1987 K10 with a 350,120,000 miles, smoke on start up Thanks Vince, after much consideration I’ve decided to pull it and have it rebuilt locally here in Maine. This engine is a son of a gun to get out and I’m no stranger to pulling these things. After 7 hours it’s still not out...maybe time to lock my tool chest and take up knitting.

09-22-2020, 09:00 PM	#6
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1987 K10 with a 350,120,000 miles, smoke on start up Glad I changed my mind, this looks like a mess. ( I’ve only put about 6000 miles on it, honest)

09-22-2020, 09:31 PM	#7
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,795	Re: 1987 K10 with a 350,120,000 miles, smoke on start up Yeah, I think once you pulled those valve covers you would have made that decision anyway. That one looks like it needs some love. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

09-23-2020, 08:07 AM	#9
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,334	Re: 1987 K10 with a 350,120,000 miles, smoke on start up I have only seen a couple engines in my life that were that sludgy. Those were high mileage no maintenance engines. Your engine has some kind of big problems. You're not one of those cold thermostat guys are you? __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

09-24-2020, 06:41 AM	#10
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1987 K10 with a 350,120,000 miles, smoke on start up I’ve only owned it for about 3 years, 6000 miles. Changed oil once under my ownership. Never overheated on me. Dropped it off yesterday with the engine builder.

10-02-2020, 12:14 PM	#11
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,209	Re: 1987 K10 with a 350,120,000 miles, smoke on start up I had an engine once like that. Pulled it out of a 73 Monte Carlo. Cleaned all the crude up in the oil pan and valleys and put it back in. Seemed to run just fine. (was to broke to rebuild at the time) Figured the PO never changed the oil. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

10-05-2020, 08:43 AM	#12
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1987 K10 with a 350,120,000 miles, smoke on start up Picked up my short block, bored 30 over.



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