Seller notes

set of (16) RAS3 studs and set of (16) poly locks from Spotts Performancesee my other auction for studs only US MADE SCREW IN Studs and US MADE Poly Locks KIT These replace Press In Studs on 389 and 421 heads.Very Popular for 64-66 GTO's and Big car 421's High quality studs are 1/2" course thread at base and stronger then factory 7/16 threads at top.Heads will need machine shop to pull studs and tap to 1/2" threadDo not hand tap your heads !!! Your studs may not be perfectly straight when instal...

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