This flow test kit allows the flow bench technician to flow test Harley Milwaukee 8 cylinder head on the air flow bench. The kit contains the following items. Pro series valve opening fixture (21″ long tee bar V8 auto heads) Part No.DEL-VOF2500 Accessory kit (brackets,springs,bell mouth,4 valve adapter, hardware) Part No.DEL-HDM8SKIT Milwaukee 8 cylinder bore fixture (3.937″ std bore) Part No.DEL-HDM83937 1.75 O.D. flow test pipe 9″ long, hardware Part No. DEL-FPHDM8175 (Upgraded to a 4.250″ cylinder bore add $55) Please e-mail with questions