Hello what is the difference between ECG -6564-A2 and ECG-6564-B2  what the difference between A2 an B2 thanks 

The A2 uses the lock nut, the B2 is the interference (adjuster, not the rocker) fit.  Same ratio on both  The rockers are a little different where the adjuster screw in (thinner on the B2).  You can use the interference fit adjuster on the A2, but it's tight as far as adjustment goes.


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Thank you.