Description: Emissions System Check Valve
Engine: 390 GT, 427-4V, 428 CJ, 428 SCJ
Model: Mustang, Shelby, Cougar, Torino, Ford, Mercury
Engineering #: C8AE-9A487-A
Service Part #: C8AZ-9A487-A
Finish: Unpainted - Shown in pictures painted Ford blue
Accuracy Rating: 9
Best Repro Available: YES
This is the best available 428 S/CJ emissions system (smog) check valve the market today. The valve has the rectangular FoMoCo die stamped in the correct location just like the originals. The other reproduction on the market also has the FoMoCo but uses a CNC machining process to look like it was die stamped.
This is the smaller nippled check valve that uses the #7 Wittek clamp.
See 428 CJ Registry website
The Ford Corporate Blue paint we have applied may not match your paint.
Q: What clamps are correct for the 428 CJ smog hoses?
A: The long hose (passenger side) uses a #7 Wittek clamp at both ends, the short hose uses a #9 Wittek clamp at the diverter valve and #7 Wittek clamp at the check valve. The S-Hose uses two Wittek tower clamps.
1968 390 GT S-code
1968 427-4V Cougar GT-E
1969 428 Cobra Jet
1969 428 Super Cobra Jet
1970 428 Cobra Jet
1970 428 Super Cobra Jet