Do I need a "valve job"

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,217
Reaction score
6,199
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
My cousin, who knows a fair bit mechanically but hes quite... good.. at thinking he knows EVERYTHING so its hard to determine, unless i already know, if he is talking out his ass, and his friend took a ride with me in my truck to the back of the property and when we got back were looking under the hood(they wanted to see) and made the comments that I need to do something about getting a valve job. I said why. They said burning oil smell.

This truck for about 10 years kinda puked a good amount of oil off the, well, any surface that oil can come out. Valve covers down. And I just fixed the valve cover gaskets this summer and retightened the one side which got loose(has since held tight?) and the engine of course is just covered in a thick veil of sludge of years of dirt, grease, oil, leaking fluid, power steering, water, you name it. As example, this is post-carburetor/valve cover, but pre retighten of valve covers (cleaned A LOT of the engine especially on top, around valve covers)
You must be registered for see images attach

I did mention this to them, and they stuck to their guns insisting this engine is gonna grenade itself soon if I dont address it. I also pointed out to them that for 10 years gasoline was about 20% of the oil because of the shear amount of richness the carb it had before ran it. So the valve train is very clean... I never took a photo but that was spotless. Since october its had the same oil, which is dirty, yes, but not diluted with fuel anymore. I was gonna put in a nice quality oil here soon since it was probably the first oil change without excessive fuel dilution in a long time. Im also gonna do a tune up. I use a wix filter, if that means anything.

despite knowing i cleaned the top of the engine and fixed the leak, they say it has to be valve related because the amount of smoking on engine didnt correlate to the amount of smell. which i also told them that every bit of oil under the valve covers, so heads, exhaust, pan, etc. is all untouched and just as full of grime as before, and a lot of it happens to be near hot-things. They still insisted.

Do I have anything to worry about? Should I do or check anything?
Oil is still got some amber to it, not much.
Oil pressure is middle of gauge at warm running 20-30 psi at idle, iirc. I forget where the middle of gauge is. 0 to 50 psi gauge I believe?
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,217
Reaction score
6,199
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
I say they are both IDIOTS.

Are they used car salesmen?
No but this is rural northern wisconsin and they both lack most of their teeth. I was just curious and making sure. THey said the only indicator was burning oil smell, which is not an indicator of anything other than burning oil, which if its not coming out the exhaust its likely the sludge on the motor that only recently stopped being replenished.
 

Arkansas_V8

Proud Redneck
Joined
Jul 1, 2019
Posts
3,022
Reaction score
3,961
Location
Springdale, Arkansas
First Name
Brent
Truck Year
88
Truck Model
V20 Suburban
Engine Size
5.7
No but this is rural northern wisconsin and they both lack most of their teeth. I was just curious and making sure. THey said the only indicator was burning oil smell, which is not an indicator of anything other than burning oil, which if its not coming out the exhaust its likely the sludge on the motor that only recently stopped being replenished.

That a crack at toothless Arkansans? Lol
 

MrMarty51

Full Access Member
Joined
Oct 25, 2012
Posts
7,500
Reaction score
9,322
Location
Eastern Montana
First Name
Martin
Truck Year
1978
Truck Model
K20
Engine Size
400
Does the engine idle smooth ?
Get a compression tester, warm the engine to operating temp, remove the spark plugs, disable ignition system so it dont make sparks, throttle wide open, screw comp test hose into the no. 1 spark plug hole and spin over the engine until needle quits climbing on the compression tester gauge. Write down that number, go to no.2 and repeat until all cylinders have been tested.
They say any cylinder that is off by 10% is a low cylinder on compression.
Low on comp. cylinder. Give those cylinders, one at a time, a few shots of oil through the sparking plug hole and repeat the compression test on those cylinders. If the numbers comes up then it is the rings, if numbers stays about the same, valves.
if the engine idles smooth and no wooshing noise out the exhaust, I would not be concerned about it.
if the engine smokes on the initial startup of the morning, then suspect valve guide seals, which can be replaced without removal of the heads, aaaand, if the compression test comes back ok, do not let them characters near Your vehicle again. I`d be leary of letting them near My vehicle if the comp numbers comes up bad too. Just because. LOL
 

MrMarty51

Full Access Member
Joined
Oct 25, 2012
Posts
7,500
Reaction score
9,322
Location
Eastern Montana
First Name
Martin
Truck Year
1978
Truck Model
K20
Engine Size
400
One more thing, bad valves will usually not cause a oily or bad smell to come off the engine.
Another thing to check is the PCV valve. Remove it from the valve cover, it should be heard to rattle, if no rattle, replace.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,217
Reaction score
6,199
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
It runs perfect and I can only imagine it will even better with new plugs and wires and cap and rotor. It doesnt have leak down that is noticeable, even a week after. Now my old 2001 olds aurora? That thing would be blue smoke after 2 hours. It burned a quart every 400 miles. I put aabout 10 gallons of kerosene in the crankcase and when it drained out it blew white smoke for 5 minutes solid when i put oil in and started. PCV is new
 

legopnuematic

Licensed Junk Dealer
Supporting Member
Joined
Oct 27, 2016
Posts
1,737
Reaction score
3,735
Location
MO
First Name
Spencer
Truck Year
1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
Truck Model
Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
Engine Size
225/6, 350 c.i., 350 c.i., 5.9l Cummins
If the engine runs smooth and such, I'd say its most likely that the old o-ring valve stem seals have hardened and cracked and are not doing much anymore for keeping oil from seeping down the stems. Which is something that small blocks are very well known to do.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,217
Reaction score
6,199
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
But even then.. its not really burning any noticeable oil and the smell is so minimal and its usually only accompanied by a tiny bit of smoldering on the manifolds or near em.
 

Rusty Nail

Full Access Member
Joined
Jan 29, 2015
Posts
9,788
Reaction score
9,684
Location
the other side of the internet
First Name
Rusty
Truck Year
1977
Truck Model
C20
Engine Size
350sbc
One guy with an opinion could get punched in the mouth and the other has nothing to fear over the internet...

Just sayin.

Maybe safety in numbers?

Could go either way but we are Professionals, i like to remind people. ;)
 

Forum statistics

Threads
42,138
Posts
909,980
Members
33,638
Latest member
bigboytko
Top