Pro model spring loaded stud girdles.  These come with sixteen 2” long adjusting polylocks.  Choose girdle for either production cast iron heads or Edelbrock heads (DIFFERENT SPACING).  Choose adjusting poly locks with either .550 base or .600 base, depending on type of rocker arm you are using.  To determine the size you require measure the base of your existing short poly locks (.550 base or .600 base).
 

Cast Iron Heads Poly Lock base 0.550
Cast Iron Heads Poly Lock base 0.600
Aluminum Heads Poly Lock base 0.550
Aluminum Heads Poly Lock base 0.600

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