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1955 Buick oil filler cap / oil filter question

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Hello !

I have a question regarding which oil filler/breather cap on the valve covers to put engine oil in. The drivers side or the passenger side of the engine. The Oil Breathers/filler caps seem to be aftermarket and have no markings on them. It is a 264 V8.

Any help would be great! I ran into this site that produces adaptors for Modern Oil filters. Does anyone have any feed back stories on them?

Thank you !


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Fill from either side.

I installed the filter adapter on a 322 engine. It is not worth the effort, in my opinion. It took several tries before I could keep it from leaking.

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