Hi All, new to the site and to the older inline 6. I have a 1946 Chevy 3100 truck project that came with a running engine and shifting transmission. When I researched the casting numbers on the block(3769925) and the head(3836850) I see that I have a 261 cid manufactured between 1958 and 1962 if all the charts are correct. Further research shows that the 261 has a fully pressurized oil system and should have an oil filter on it. Long story short, this engine doesn't have an oil filter on it but has a 1/2 NPY fitting to the right of the exhaust(oil filter return) that is oily and has the ports and dowel hole left of the exhaust(full pressure to the filter) but doesn't look like they have been used. Looks like the engine has been running this way for awhile(by the looks of the plug being eroded) so am I okay to keep running it or will it trash the engine because of lack of oil? I will try to attached some pictures. Any help is appreciated. Thanks
1946 Chevy 1/2 ton 1946 Chevy 1/2 ton donor Early 1947 GMC 1/2 ton long bed donor
