Oil Filter location 318 69 Valiant

Newbomb Turk said
How does it add an extra oil leak? The plate still needs to seal to the block and the filter still needs to seal to the plate.

I don’t see a place for an extra leak.

What I do know for sure is that no decent header will even have clearance for short filter. And I don’t know what is worse. The short filter, the plate or both together.

Last time I looked at it, a plate and a short filter was a 12 or so PSI loss. That’s huge. And it’s not good either.

my mistake, i assumed the adapter attached to the existing filter plate. it as you pointed out replaces the plate so in fact as the adapter is a casting it's more rigid so actually less likely to leak.
re shorter filters and headers, the 3 a bodies i've fitted headers to were fine with a motorcraft efl90 filter (readily available here in the uk.
neil.