Check Valve Inline -4 an Black / One Way Valve Exhaust Components AF463-0032BLK

AF463-0032BLK

Specifically designed for 396-502 cubic inch big-block chevy engines with large oval-port cylinder heads (1975and earlier) operating from 1500 to 6500 rpm range

Part Number: AF521-20

this is a typo

x20xev) 10/91-95

Check Valve Inline -4 an Black / One Way Valve Exhaust Components AF463-0032BLKPart Number: AF612 04BLK one way check valve. this one way check valve features a male an fittings oneither end in sizes ranging from 4 through to 16. The valve comes with a 1. 5psi spring installed and there is an optional 5psi spring where required. The length of the valve body is 29mm for the 4 to 8 or 35mm for the 10, 12 and 16 unit. available in blue, black and silver.