Quote: On my '83 truck, the oil pump doesn't have a standpipe, and doesn't have threads on the inside of the big hole where you could screw one in.
Yeah, it does have those threads, otherwise there'd be no way to attach the oil filter. The central adaptor piece that the oil filter threads onto, itself threads into the oil pump. There are adaptor pieces both with and without the standpipe, but the standpipe itself does not screw into the adaptor piece. It's pressed in.
Quote: i also have a short oil filter. sometimes on startup after the truck has been sitting for a few days i hear rattling from the valves not getting oil i assume.
The lifters on the '81-up hydraulic-lifter slant-6s are dead-last to receive pressurised oil. They are at the very end of a very long hydraulic path. As long as everything's clean and unworn and you're using the right grade of oil, they feed pretty quickly. When there's dirt in the passages and things are worn and you're maybe not using the right grade of oil and maybe not using such a good quality filter, they take awhile to get their oil. You may want to try cleaning out the engine using my Soup recipe, then service the oil pressure regulator valve. Then make sure you're using quality filters (not Fram) and the right grade of oil for your temperature conditions — what are your outside temperatures like, and how many miles are on this engine? — and your lifters shouldn't take so long to get oil.
The taller filter is better at holding oil because there's more oil (== more weight) pressing down on the antidrainback valve after shutdown. You can still get oil draining down the centre hole, of course.
If you can't find a standpipe, you can always use the filter with the built-in standpipe.
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