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#1055273 - 01/12/18 06:22 PM Sticky valves  
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Buick Runner Offline
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Buick Runner  Offline
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Dharma station 1 the Hydra
I suspect my 305 has sticky valves. On a cold start it runs rough like its missing but smooths out once warmed up. I have heard that SBCs are prone to developing sticky valves if they sit around, especially since stock heads do not use bronze insert valve guides.What would be a good fix for this, remove the covers and spray the valve stems with cleaner or just use something like Marvel Mystery Oil? Suposedly modern E10 is real bad at leaving varnish on valve stems on engines that sit. Also suspect my 1946 tractor engine has sticky valves too as it behaves similar when cold, but clears up faster being solid lifters and uses bronze valve guides.


SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1055277 - 01/12/18 08:47 PM Re: Sticky valves [Re: Buick Runner]  
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Reno, NV
I suppose a cold engine compression check would confirm your sticky valve suspicions. I'm not a fan of snake oil engine elixirs fixing anything. Pull the heads and do a valve job.


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#1055287 - 01/13/18 03:13 AM Re: Sticky valves [Re: Buick Runner]  
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Marvel Mystery Oil would be my first choice, in the oil with a fresh oil change, next would be a quart of Dexron II in place of a quart of oil, good luck!


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#1055292 - 01/13/18 02:58 PM Re: Sticky valves [Re: Buick Runner]  
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Buick Runner Offline
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Thanks, it may be a little while before the weather clears up before I can do much but I like to have a plan once Spring comes. My tractor also acts similar and both it and the Regal sit around. Once they both warm up they smooth out.


SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1055294 - 01/13/18 06:21 PM Re: Sticky valves [Re: Buick Runner]  
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Richie Cat Offline
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Lake Ronkonkoma, N.Y.
Where is your location?
I guess you car/tractor are either outside or in a building with no heat.
Do the valves make a lot of noise on start up?
How high is your oil pressure cold and what weight oil are you using?


83 SC, 355 w/TPI
#1055298 - 01/13/18 09:49 PM Re: Sticky valves [Re: Buick Runner]  
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Dharma station 1 the Hydra
I am in Southern NJ. Both are outside as my barn is falling down. Neither make noise, just misfire some and run a little rough until they are warmed up, though they do not stall when cold. My Regal doesn't have a oil gauge, the tractor does and it reads good.


SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1055302 - 01/14/18 10:43 AM Re: Sticky valves [Re: Buick Runner]  
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Richie Cat Offline
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Lake Ronkonkoma, N.Y.
Sticky valves would give you valve clearance and make noise. I'm guessing you have multi weight oil in both of them. The only other thing would be the compression cold and as it warms up it get's better. Unless you have a lifter that bleeds down slightly when you shut it off hot and takes some time to pump back up with cold oil.


83 SC, 355 w/TPI
#1055305 - 01/14/18 03:25 PM Re: Sticky valves [Re: Buick Runner]  
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Dharma station 1 the Hydra
My 305 probably does sit around long enough (sometimes for months) for the lifters to bleed down. It has roller tip rockers so not sure if they can mask ticking. The tractor uses solid lifters as it predates hydraulic lifters. It may not even be a bad stick, but just a slight delay in closing? Running some MMO is cheap enough to try.


SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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