The restrictor size used in the conventional canister filter is 1/16". If a spin-on filter is substituted for that type it also needs a restrictor in the system or the engine bearings will be starved for oil from the volume going through the filter and back into the oil pan. I use a Holly carburetor jet with a 1/16" hole in it as a restrictor if someone insists on a spin-on filter installation.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!