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Fitment-
These guide plates are intended for Gen 5/6 BB Chevy heads which have rocker studs w/ 3/8" threads on the bottom side of their rocker studs.
Early BB Chevy studs (Mark IV) use 7/16" base thread however, later BB Chevy (Gen 5/6) use 3/8" threads which is what these guide plates are intended for.
The stud holes in the guide plates are 10mm.
Specs:
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