The Stovebolt Site Forums The Shop Area Engine Shop Oil filter bypass line 336 V8

Anyone know where the oil filter bypass line terminates on a 1958 GMC 336 V8. When I got the 336 the line was missing from the filter housing. I know some people plug them but I want to plumb mine the right way. Anyway, any help would be appreciated.
Thanks,
Craig

graydon I think it dumps back into the crankcase and it may be metered to maintain oil pressure. The ones they plug might as well remove that cumbersome filter if they don't use it.

Where does the other end of this line connect? I'm pretty sure the oil filter bypass function is internal to the engine oil filter base shown at the top of the page below from the 1955.2-1960 GMC Master Parts Book.

By the way, if you are not a stickler for originality you can replace the complete filter assembly with a spin-on system from a later model Pontiac car. All real Pontiac V8 engines (last one built in 1981) use the same gasket between the block and the oil filter base, so later parts bolt right on. Most mount the spin-on filter cartridge straight down, but some tilt the bottom of the cartridge towards the driver's side a bit and certain hi-po models rotated the filter bottom towards the rear of the car some to clear headers. In any case, the spin-on filters are cheaper, easier to find and much less messy to change. I got the one I used on my 57 GMC 102 with a 347 V8 from a 1977 Pontiac full-size car at a local junk yard.

I went back and re-read the original post. Seems to me that Craig may be referring to the threaded opening on the filter base that I point to in the picture below. If so, that is where the oil pressure sensor (if he has an electric oil pressure gauge) or the tubing that connects to the oil pressure gauge (if he has a mechanical oil pressure gauge - most likely) plugs in.