FOR OLDSMOBILE V8, INTERNATIONAL V8
DRILLED FOR SAFETY WIRE
ALL HEADER KITS (EXCEPT STOCK STYLE HEX KITS) CONTAIN HIGH STRENGTH BOLTS
-USE 3/4 LENGTH BOLTS FOR HEADER FLANGES 1/4" THICK OR LESS
-USE 1" LENGTH BOLTS FOR HEADER FLANGES OVER 1/4" THICK
-1 1/4" AND 1 1/2" LENGTH BOLT KITS ARE FOR CAST IRON MANIFOLDS, CHECK YOUR ORIGINAL BOLT LENGTHS BEFORE ORDERING, SOME EXHAUST MANIFOLDS USED SEVERAL BOLT LENGTHS.
SIX POINT - HIGH STRENGTH OR TWELVE POINT HIGH STRENGTH