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GMC frame Top flange has an overhang on engine side to a 12 1/2" overall header size. Top flange has a total of 14 holes, 9
drilled clearance for 5/16" bolts and 5 tapped 5/16" N.C. threads. Bottom flange has 11 holes, 6 drilled
clearance for 5/16" bolts and 5 tapped 5/16" N.C. threads. One bracket at top of frame with a 7/16" diameter
hole. Two “sleeves” welded on gussets on engine side to accommodate cross bars. Eight 5/16" N.C. threaded
holes on sides of rail, 5 on engine side and 3 on grille side. Twelve 3/8" threaded holes on “flat” side of rail.
Note: side frames are not interchangeable. (left side shown here.)
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