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Old 08-04-2010, 10:47 AM   #1
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What Weight Oil To use in a 347 Stroker

There are a lot of opinions out there and I was wondering what weight oil is everyone using in there 347 stokers builds. My setup is strictly for the track and I have been using mobile 1 10w-30 but some others are using 20w-50. Just trying see what is the best oil for the conditions.
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Old 08-04-2010, 11:13 AM   #2
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bearing clearance and rpm?
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Old 08-04-2010, 12:29 PM   #3
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Not sure on the bearing clearance since the engine was built when I bought the car. I run it up around 6800 to 7K in rpms.....
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Old 08-04-2010, 04:40 PM   #4
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I would never run 20w-50 thats old school thinking especially for small blocks. I would run anywhere from 0W-30 - 10W-30 synthetic.
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Old 08-04-2010, 06:32 PM   #5
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Old or new school makes no difference Its down to clearance and rpm. Some people like them loose others don't its all in your school of thought and what works for you. Most all modern production engine run light oils because oil emission and fuel mileage requirements thus manufacturers adapting to small clearances. put 5 30 in an older motor you tell me the pressure. I tend to like to see high pressure around 60 hot on cruise and around 25-30 idle. power loss maybe. well lubed 100%. Put 20W50 in a low mile new car bearing wipe out simple as that.
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Old 08-04-2010, 06:34 PM   #6
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side note most current manufacturers also get away with very light oil not only to the clearances but film technology added to the bearings and other bearing surfaces or wear surfaces.
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Old 08-06-2010, 11:12 AM   #7
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I know where your coming from with the clearances, but I still think its old school. With the technology these days I would never run 20W-50. If you want to run loose clearances then you just run a high volume not high psi. to supply more oil and still run 10w-30 with a deep pan(for extra oil capacity). When talking about rpm, I would never run a heavy oil in a high rpm motor. Its harder for the motor to pump and its going to move slower.
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Old 08-06-2010, 04:53 PM   #8
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Probably getting a little off subject here but, It's my understanding that bearing clearances have not changed that much for new production in the last 30 years. It's the tolerances that are closer.

Clearance is the space in between. Tolerance is how much that space can vary. Either positive or negative and from part to part.
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Old 08-06-2010, 06:43 PM   #9
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Bearings clearances

My bearings clearances varies beetwen .0015 and .002. I am running Castrol GTX mineral 5W30 and when starting the car cold the pressure come at 60psi. After 15s i start rolling until 3000rpm and the pressure come up at 70psi.
When crusing at operating temperature (178°F) the pressure stay mostly at 60psi.
When idling it only drop under 35psi when the car is really hot.
Most of the time at idle the pressure stay at 40psi.

I would have like to use 15W40 into that engine but because of clearances i use lighter oil to get better lufrification especially when the engine is cold.

This is with a stock oil pump.
This engine have approximately 2000mi.

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Old 08-07-2010, 10:56 AM   #10
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FWIW, I have run several different oil weights in my 331 with no ill effects. The bearing clearances were approximately 0.018". After initial startup with 10-30 mineral oil I performed an oil and filter change after 20 minutes of running to get rid of any junk that might be floating around. I then ran 10-30 mineral oil for about a thousand mile before switching to mobile 1 10-30. This motor was just removed at 122,000 miles due to a broken camshaft to gear pin (the exhaust valves were bent very slightly so I don't know if the pin broke because of the p-v contact or the other way around, stock AFR springs with 80,000 miles?). In the 121,000 miles since the mineral oil was last used in it, I ran mobile 1 10-30, 15-50, and for about the last 60,000 or so miles 0-40 (I get it for free at work). Either way the short block looks great no real signs of wear on the bearings and I totally plan on using this short block with a different cam.
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Old 08-07-2010, 11:06 AM   #11
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Oh, just one more thing. I think the most important thing is to do regular oil changes. Especially if you drive your car infrequently. I change my oil and filter at 3-4000 miles but I drive my car a lot sometimes as much as 700 miles a week. If you drive sporadicly and for short periods of time the oil should be changed more frequently. Short trips allows moisture and contaminates to collect and not burn off or evaporate because the oil doesn't get hot enough or for a long enough period of time. Dave.
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