FLOTEK Thumper Cylinder Head - Assembled - 2.020 in/1.600 in Valve - 185 cc Intake - 60 cc Chamber - 1.460 in Springs - Angle Plug - Small Block Ford Laundry Detergent The thread connection is 1/2

The thread connection is 1/2 in

Easy no drill installation and all the necessary hardware is included

CARB EO #250-3

Chevy Monte Carlo 1981-1988

FLOTEK Thumper Cylinder Head - Assembled - 2.020 in/1.600 in Valve - 185 cc Intake - 60 cc Chamber - 1.460 in Springs - Angle Plug - Small Block Ford Laundry Detergent The thread connection is 1/2Product Description: Cylinder Head Thumper Assembled Flat Tappet 2. 020 in 1. 600 in Valve 185 cc Intake 60 cc Chamber 1. 460 in Springs Angle Plug Aluminum Natural Small Block Ford Sold Individually Flo Tek manufactures aluminum cylinder heads for big block Chevys and small block Chevy and Fords. Each head comes preassembled with valves and springs.