This block has a provision for a 1/8" NPT primer nozzle as well as a counterbored hole that allows a 1/4" socket head bolt to mount the block to the injector. Made from billet alum. to keep it lightweight and anodized for corrosion protection.
All nine fuel line holes are tapped 1/8" NPT while the side and top port are tapped -8 ORB. Block measures 2.600" x 1.500" x 1.250".