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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The forward/left hole on the left (driver's) side of the block is the return hole and the right/rearward hole is the supply hole. There are only two lines connected to the filter canister. One of the ports on the filter canister is a drain hole. The fitting in the rearward supply hole in the block is often a T-fitting. One side going to the filter canister and the other hole going to the oil pressure gauge.
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