Re: Shorter oil filter?
If you're changing the oil every 3-6000 miles the shorter filter is fine, it's all the same specs internally other than less filter area due to the shorter pleated paper inside. If you go long periods between oil changes such as with synthetic oil, you may want to consider changing the filter ever so often and dumping in an extra half quart of oil. Once again that's not necessary if you change every 3-6000 miles.
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67 Fairlane GT, 390, 4 speed
78 F150 rockcrawler truggy, 351M, 4 speed, 42" tires