They could be straight fitting threads or tapered pipe threads. Looks like the one down toward the rear of the block with the tee fitting might be tapered. You'd need to undo them to really tell.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
