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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 |
$130 |
| HUB FOR SBC, 6 BOLT, CHEVY OEM
FRONT, (2) 3/16 KEYWAYS |
916172 |
$150 |
| 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
1.940” Seal
Diameter
For the economy minded racer who is limiting boost using
the standard small block crank, ATI offers a 1.245 bore
hub with a 1.940 seal diameter and a seal that fits the
stock small block timing cover. This increases the wall
thickness to .347” - a 35% increase!
| Applications |
Part
# |
Price |
| HUB FOR SBC, 6 BOLT,
CHEVY OEM FRONT, (2) 3/16 KEYWAYS |
916169 |
$141 |
| HUB FOR SBC, 6 BOLT, CHRYSLER
FRONT, (2) 3/16 KEYWAYS |
916168 |
$141 |
| TIMING COVER, CHROME FOR SB CHEVY
V8 AND V6/90º, UP TO 1992 |
925501 |
$47 |
| SEAL FOR V8 & V6 90° |
973134 |
$15 |
LT1 Engines with 2.25” seal diameter
For the LT1, blower damper hubs have a 2.25" seal
diameter and ATI machines the timing cover to accommodate
a new seal. This is a must on the LT1 due to the long
hub length. Timing covers are also available.
| Applications |
Part
# |
Price |
| HUB FOR LT1, F BODY,
6 BOLT |
916048B |
$138 |
| HUB FOR LT1, B BODY, 6 BOLT |
916049B |
$152 |
| HUB FOR LT1, Y BODY, 6 BOLT |
916096B |
$143 |
| TIMING COVER, LT1 (‘92-’94)
WITH 2.25” SEAL |
925510 |
$248 |
| TIMING COVER, LT1 (‘94-’95)
WITH 2.25“ SEAL |
925512 |
$298 |
| TIMING COVER, LT1 (‘96-‘97)
WITH 2.25“ SEAL |
925511 |
$219 |
ATI also offers hubs and timing covers for those racers
who have gone totally big block: diameter and seal (re:
Sprint Cup). Many damper designs are available from ATI
including serpentines with additional grooves for supercharging
any engine. Consult an ATI Sales Technician for applications.
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