Re: 305 v6 oil filter
On these engines, the oil filter attaches to a bolt-on housing at the left (driver's) side rear of the engine block. The early housings and those used on the large V-6's usually used the canister-type filter, many of the later ones used a spin-on type filter. However, some V-6's had no oil filter at all, and just had a plate bolted on the engine to block off the passages to the filter housing. Adding an oil filter is simply a matter of bolting on an oil filter housing as TJ pointed out.
Now time for some trivia- some late production spin-on oil filter housings were slightly larger in diameter and took a Chevy style filter (PF35) instead of the Buick/Pontiac/Olds (PF24) type. Extra points if you score one of those!
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