This is what I did, but you have to get the crank double keyed.
Supercharger Damper Hubs & Timing Covers
Supercharger Super Dampers
Supercharger Super Pulley
Supercharger Damper Hubs and Timing Covers
V-belt to Serpentine Conversion Kit
Y-Body, F-Body, & C/K-Body Serpentine Conversion Kits for LS1 & LS2 Engines The early small block Chevrolet and the later LT1 and LS1 engines all present problems when supercharging. The original Small Block and the LT1 have a shaft size of 1.245” and a seal diameter of 1.760 leaving the hub wall thickness at .257” or just over 1/4”. Many engine builders put a 1/4’ key in the crankshaft leaving just 1/8” of material between the groove and the seal surface. The result is a failed hub that destroys the damper and the nose of the crank shaft. The later LT1 and LS1 are even worse with just a press fit and no keys; a total disaster when you try to supercharge and drive the blower from the damper. To remedy this situation, ATI now manufactures a variety of Small Block Chevrolet hubs for supercharging.
Big Block 2.331” Seal Diameter
For the serious racer with high boost requirements, ATI offers a small block Chevy crank hub with the big block 2.331 seal diameter increasing the wall to .562; a whopping 220% increase that totally eliminates failure at this point. A new timing cover and seal are required. For small blocks up to 1992.
Applications Part #
Price
HUB FOR SBC, 6 BOLT, CHRYSLER FRONT, (1) 3/16, (1) 1/4 KEYWAY*
916135
$141
HUB FOR SBC, 6 BOLT, CHRYSLER FRONT, (2) 3/16 KEYWAYS*
916136
$141
HUB FOR SBC, 6 BOLT, CHEVY OEM FRONT, (2) 3/16 KEYWAYS
916172
$130
TIMING COVER FOR SB CHEVY, WITH BB SEAL, CAST ALUMINUM
925500
$150
HUB FOR SBC WITH BB SNOUT - CHRYSLER FRONT - 3/16" & 1/4" KEYWAY
916134
$141
*Room in front of damper for ignition trigger wheel located on hub