The regular counter guy at Summit must have been on a break. I'm sure that all the 66's need the grooved cam. I'd hate to say 'get the grooved cam' and have you get the wrong one. Check the build date of your engine, the earlier in the year, the better the chance it would need a grooved cam.
I've also heard you can put a grooved cam in a newer block without a problem as a friend said they did this years ago (and I think the motor is still running). Would love to hear more about this!
I've also heard you can put a grooved cam in a newer block without a problem as a friend said they did this years ago (and I think the motor is still running). Would love to hear more about this!