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Old 06-02-2009, 09:54 PM
Giverhell and hopefer the best
 
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Smoke'n motor

Hey guy iam haven alittle trouble with my 355 chevy. Its a 78 4 bolt main 30 over and an rv cam. It has a holly four barrel intake 600 cfm eldbrock and shorty headman headers and a high voliume oil pump that i put on. Its in my 86 blazer with 700r4 and 3:73 12 bolt rear. Well the problem is when i get on the interstate it smokes above 55mph if i Share down on it and run the rpms above bout 2200. It dont do it till i get above 55mphs. I have tacked it above 4 grand a few times and it dont do it, well it did till it got bout 7000 miles on it. I was wonderin if the carb would make it do this. The carb never wants to idle right. Iam hopein to get a new one soon. I would tell yall more bout the motor but i bought it from a guy that rebuilt her. So i dont know much bout the cam or rings. Thanks fer all ur help.

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Old 06-02-2009, 10:04 PM
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check the vacuum line that goes to the trans,I have seen them suck trans oil there already..And it will smoke.. Sorry I thought you had a 350 turbo..

What color is the smoke ?
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Old 06-02-2009, 10:38 PM
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smoke'n motor

Its a light color maybe blueish. Its hard to tell from the rear view.
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Old 06-02-2009, 11:12 PM
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Check to see if you are sucking oil through the PCV valve.
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Old 06-03-2009, 12:08 AM
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Thats a good idea. What should i be lookin fer exactly? I have had the pcv out a few time and it had oil on the end that is in the valve covers. I would think this would be normal. Corse i'm no master so i could have that wrong. Thanks
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Old 06-03-2009, 12:17 AM
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Red neck blazer,

It could be coolant. Check the cooling system
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Old 06-03-2009, 12:23 AM
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I checked the coolant. It hasn't loss any coolant since i had the rad patched. Thanks tho.
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Old 06-03-2009, 07:38 AM
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pull the hose off the carb,or where ever you have it hooked up to.And see if there is oil there..
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Old 06-03-2009, 10:12 AM
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Red neck blazer,

Then my money is on bad seals or guides on the intake valves. As the engine speeds up the vacuum at the valve guide raises and pulls oil into the intake port which then gets burned and results in smoke in the exhaust. The bad news is the only way to check the seals is to take the valve spring off so you can feel the seal I am betting that it is hard and letting too much oil down the stem of the valve. To check the clearance between the valve stem and the valve guide itself is to wiggle the valve in the guide. There should be VERY little movement.

Good Hunting
Scholman
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Old 06-03-2009, 03:01 PM
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Check the torque on the intake bolts, the 4 middle ones were loose on my 350 and it smoked just the valve seals were bad. Just a idea and its quick and easy to check Jake
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Old 06-03-2009, 03:37 PM
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Quote:
it smokes above 55mph if i Share down on it and run the rpms above bout 2200. It dont do it till i get above 55mphs. I have tacked it above 4 grand a few times and it dont do it
Getting back to the PCV valve- if you have aftermarket valve covers, there might not be any baffleing for the PCV valve. This will let oil right up into it- especially at higher RPM where the oil is splashing around inside the v-cover pretty good.
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Old 06-03-2009, 05:09 PM
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Smoke'n motor

Now that some one has mentioned the intake oil does sit on it underneath the carb. Not all but i have wiped it up befer and it comes back. And if it is the seals then it will have to wait cause i'm workin on a 383 stroker. And ill check the pcv valve in the morning cause i at work now. And they are after market covers but there are baffles in there.
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Old 06-03-2009, 06:31 PM
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Burning oil

Check your headers and see if you can see any sign of them burning oil that has leaked on them. It is possible that your motor is blowing oil out at hi rpm & the oil is hitting the hot headers.
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Old 06-03-2009, 07:00 PM
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If it was blown oil here from? Inside the head or maybe the intake. Cause like i said a small bit of oil sits on the intake.
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Old 06-03-2009, 07:21 PM
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Blowing oil.

Your questions are moot unless you discover oil being burned on your headers. If this is the case, then it helps in narrowing down the search. Examine your headers... if you see them black & stained... or better yet, smoking, then I believe you have narrowed down the problem.

Are your hot headers burning oil on the outside, or is the motor consuming oil & burning it.
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