Gentlemen;
The ones I've seen (large trucks) in California had the filter on the firewall except for the low pres/by pass(cars/light trucks) which were on the manifold. Perhaps the trucks were built differently on the east coast. Here big trucks had 2 1/2" steel lines that ran to the frame where rubber ones turned up connecting to another set of steel lines that connected to the filter canister.
The "issue at hand" is running flamable liquids near a 900+ degree heat source. There is NO engineering school or theory in the world that subscribes to this nonsense. It is not done on aircraft, watercraft, motorcycles or other land based vehicles as a result.
Here however, you see (aftermarket)fuel filters mounted right above the exhaust with rubber hose/clamps and this type of (home brew)oil filter commonly advised etc.
The factory 'by-pass' ones got away with it because of the low pressure. The factory solid 1/2" steel lines were used here in Calif. to solve the problem from 59-62 as mentioned but it still remained as the rubber ones often leaked from engine/vehicle motion.
'Hot Rod' engines with more compression run faster with higher oil pressure and create much more heat in the process. Most of these have filters away from the exhaust system.
The 261 does not. This is why I build them W/O any chance of an oil fire for my customers/removing the oil filter option.
An 'oil fire' is one of the most devastating events on earth and I sincerly hope that none of you (Inliners Inc.) personaly find out how.
