Model 1113 - Chevrolet 396-500 - Fits Heads with STOCK Stud Location (SAVE 20% On Adjustment Nuts When Bundling)
Chevrolet 396-500+ Spring-Loaded Girdle Bars. Fits Heads W/STOCK stud location.
Your Rocker Arms dictate which type of adjustment nuts are needed. If you are unsure which set you need, you can measure the base diameter of your original poly-locks that came with your rocker arms.
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