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GM Locking Header Bolt Kits

GM Locking Header Bolt Kits

Stage 8 Locking Header Bolts easy to use and they are real assurance against horsepower loss or gasket failure created by loose nuts or bolts.

The unique patented and trademarked functional design is just three pieces: a bolt (4130 Alloy Steel), a locking retainer and a spring clip.

The header bolt kits are application specific as either hex head with a 3/16 recessed allen head or 12 point, USA or metric. All Stage 8 Locking Header Bolt Kits are sold with all of the necessary hardware for your application.

GM Locking Header Bolt Kits By Application

NOTE: DHH = DOUBLE HEX HEAD BOLT, INCLUDES 3/16 RECESSED ALLEN HEAD

Inline 6/6 Cylinder
Inline 6 6911 (8) 3/8-16×1 1/4″ bolts 12pt Buy Now
V6 With 3/8 Bolts 8911 (12) 3/8-16×3/4″ bolts 6pt DHH Buy Now
8911A (12) 3/8-16×1″ bolts 6pt DHH Buy Now
8931 (12) 3/8-16×1″ bolts 12pt Buy Now
8951 (12) 3/8-16×1″ bolts 6pt Stainless Steel DHH Buy Now
V6 2.8 Liter 6910 (12) 8mm-1.25x25mm bolts 6pt DHH Buy Now
V6 3.8 Liter 6912 (12) 5/16-18×7/8″ bolts 6pt DHH Buy Now
8 Cylinder
Small Blocks
265-400 cu/in
8911 (12) 3/8-16×3/4″ bolts 6pt DHH Buy Now
(exc. ZR1 and w/ Brodix heads) 8911A (12) 3/8-16×1″ bolts 6pt DHH Buy Now
8911B (12) 3/8-16×1 1/4″ bolts 12pt Buy Now
8931 (12) 3/8-16×1″ bolts 12pt Buy Now
8951 (12) 3/8-16×1″ bolts 6pt Stainless Steel DHH Buy Now
Small Blocks w/ Brodix heads 8912A (16) 3/8-16×1″ bolts 6pt DHH Buy Now
All LT Series (LT1 thru LT4) 2014-on 8917 (10) 8mm-1.25x25mm bolts 6pt DHH Buy Now
Small Blocks w/ 8mm bolts – All LS Series (LS1 thru LS9), LM7, 4.8 thru 7.0 Liter 8900 (12) 8mm-1.25x25mm bolts 6pt DHH Buy Now
ZR1 350 C.I.D. 8908 (32) 8mm-1.25x30mm bolts 12pt Buy Now
OEM Corvette headers ’84-’95 8907 (12) 3/8-16×2″ bolts 12pt Buy Now
Big Blocks 396 – 502 cu/in 8912 (16) 3/8-16×3/4″ bolts 6pt DHH Buy Now
(exc. 348 & 409) 8912A (16) 3/8-16×1″ bolts 6pt DHH Buy Now
8912B (16) 3/8-16×1 1/4″ bolts 12pt Buy Now
8932 (16) 3/8-16×1″ bolts 12pt Buy Now
8952 (16) 3/8-16×1″ bolts 6pt Stainless Steel DHH Buy Now
Big Blocks 348 & 409 cu/in 8101S (14) 3/8-16×1″ bolts 6pt DHH Buy Now
Vortec 8100 8912V (16) 8mm-1.25x25mm bolts 6pt DHH Buy Now
6.2 Liter Diesel 8912M (16) 10mm-1.50x22mm bolts 6pt Buy Now
Buick, Olds Pontiac ’79 and older
8916S (12) 3/8-16×3/4″ bolts 6pt DHH Buy Now
8916A (12) 3/8-16×1″ bolts 6pt DHH Buy Now
8936 (12) 3/8-16×1″ bolts 12pt Buy Now
8956 (12) 3/8-16×1″ bolts 6pt Stainless Steel DHH Buy Now
2-Bolt Header Kits
8910A (2) 3/8-16×1″ bolts 6pt DHH Buy Now
8910B (2) 3/8-16×1 1/4″ bolts 12pt Buy Now
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