4 options:

- wait til they’re available

- turn down a .502 guide

- ream hole in head to .500, use a .502 guide

- put a liner in the old guide

When I was messing with those heads on a semi regular basis....... if they needed guides(most did), I made them so I could use .502 guides.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads