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30 weight high detergent was recommended back in the day. Modern oils are much better today, if it's been rebuilt, a quality 10w40 will work great. If this is an older motor, I would stick with the 30 weight.

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Q: What oil to 283 Chevy small block?
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Does the 350 CID small block Chevy motor have the oil fill tube in the intake manifold?

No. That would usually be a 283, 307, or 327.


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