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Old 01-15-2008, 08:00 PM
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SB chevy 350 using oil

I have a question concerning my 350 engine. I have been through this engine a few times over a period of 15 years. Mainly i just like playing with the engine. The last time before removed it it was using oil (1qt 1000miles) it seemed to be mainly the #8 cyl cause it would get alot of build up after 3-5k miles,,no other plug had that problem. The heads are world product S/R i bought new and the engine had 20-30k miles. I put pc seals on the valves thinking there was something wrong with the heads but no help. So when i pulled the engine i looked at that cylinder and piston couldn't see anything wrong. Had the block machined honed and put in new rings. The rings i put in last time were file fit and i thought i might have made the gaps too wide. The new rings were standard gap so i didn't have to file fit them. They are 1/16 rings. The heads were re done. They had lots of carbon buildup on the intake valves. The engine is back in and runs ok. It has about 1300miles now but it's using 1qt 500miles and that #8 plug seems to be developing build up again. So i think i'm going to end up with the same problem. Could there be anything unrelated to that cylinder that would cause this problem? I want to exhaust as many possibilities as i can before i start over with a new block and pistons. Thanks for your help

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Old 01-15-2008, 08:13 PM
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would your intake have a leak on that runner alone? i ported a set of heads once, on one runner i over done it. it leaked in from the lifter valley, but if that is your problem your engine would try to keep running due to the vacuum leak.
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Old 01-15-2008, 08:57 PM
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Where is your PCV hooked up? If it is to that runner on the intake it could be sucking oil there.Check for baffle in valve cover and good PCV. But if you rebuilt the engine then ran it several thousand miles then took it apart and honed it to rebuild again, you might have too much piston to cylinder clearance and all the file fit rings won't do any good.
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Old 01-15-2008, 10:50 PM
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Quote:
Originally Posted by speedydeedy
Where is your PCV hooked up? If it is to that runner on the intake it could be sucking oil there.Check for baffle in valve cover and good PCV.
That's what I was thinking.
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Old 01-16-2008, 05:38 AM
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re: SB chevy 350 using oil

I have the PCV valve connected to the front of the edelbrock carb. The big port at the center in front. The valve covers are generic chrome with baffles but i did raise the valve up out of the valve cover with 5/8 heater hose because there was some oil getting in the vacuum line to the valve but i don't think it is the problem. Unless the path the oil takes goes to that back runner to the 8 cyl. I have wondered about the intake. It has been on and off alot of times over the years. It's a performer RPM. But i am pretty sure it has no vacuum leaks. The engine was bored the previous overhaul with probably 20k-30k on it. I wouldn't think it would have much wear. I tried to check the taper with a new ring when assembling but it seemed ok. I suppose a bad bore or maybe even a bad piston could cause too much clearance. The pistons and walls really looked good this last time, not alot of scoring or anything. I will probably put some more miles on it since it is still new,,then probably start with a different block. I am hoping it is not the heads since they have low mileage. I appreciate all the suggestions.
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Old 02-07-2008, 05:12 PM
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SB chevy 350 using oil

Ok, i have removed the intake and found a few things. First the intake slid right off after removing the bolts almost too easy. The intake gaskets seemed oil contaminated or soaked and there was thin film of oil around the intake ports. The intake valves all have some oily buildup on them already. The gasket was also split around one bolt hole but not into any port. The gasket looked like it had been on for years instead of a just 1000 miles. I didn't notice any vacuum leak symptoms while it was running but it seems like there is oil getting sucked in past the gaskets maybe at least on the #8 port. I also think my pcv valve is sucking oil which is adding to the problem. I have those cheap no name summit valve covers with baffles. The baffles appear like they should work but i have heard they can cause problems. The intake is a performer rpm and i am going to replace it with a new one same brand. CAn anybody suggest a good intake gasket and also an easy way to maybe fix the pcv system so it won't suck oil. I have read several posts about pcv sucking oil but haven't found a common fix. I would lean toward trying easy stuff first like restricting the vacuum or using scotch bright? maybe use a baffled grommet with my baffled covers? i have the normal set up with a breather in the pass side the valve in the drivers side hooked to the front pcv port on a edelbrock 600cfm. Once again thanks for any suggestions.....
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