BarnBuster
Virtually Unknown Member
I had a IHC Scout way back when that had a cartridge type insert that the seal ring was always a bitch to get on right.One more step I haven't seen mentioned (and I learned it the hard way).
Once the old filter is down, make positively sure that the rubber seal is still with the filter.
I changed the oil on a freshly rebuilt H/P 351 with out performing that step & within a few days that motor was gushing Texas Tea.
Fortunately Momma (being suitably mechanically inclined) shut it down & saved lots of my hard work.
Closer inspection showed the previous seal stuck solidly to the (freshly painted) block.