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Q: I have a 1964 260 stock V8. Oil pressure is varying from 10 to 50 pounds while driving. I changed the oil pump and it ran normal oil pressure for about a month and has started to vary in pressure again! Also changed gauge; no difference. Engine has about 12,000 miles on it since being rebuilt. Any ideas as to what could be causing this problem?

A: Many things can be the cause, but the first thing I'd look at is the gauge's oil line and fittings (it's a mechanical gauge, isn't it?). These things can clog and give weird readings. Electrical pickups (if applicable here) are notorious for doing this. If the pressure really is changing, you could have leaking lifters or a clogged oil gallery. 260s had oil return problems that were redesigned for the 289.

 


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