421-04-6220 Thermostat Housing 1" Push on with 3/8" NPT Bypass
These polished stainless steel thermostat housing are designed to work with our water crossovers on Chevy small block and big block.
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421-04-6230 Thermostat Housing 3/4" NPT with bypass
Thermostat housing 3/4" NPT with bypass
These polished stainless steel thermostat housing are designed to work with our water crossovers on Chevy small block and big block.
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421-MP-65 Thin Nyloc Nut 1/2”-20 Thread, 18-8 SS
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421-MP-51 Thin Nyloc Nut 3/4”-16Thread, Polished, 18-8 SS
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421-MP-50 Thin Nyloc Nut 5/8”-18 Thread, Polished, 18-8 SS
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421-MP-66 Thin Nyloc Nut 7/8”-146Thread, Polished, 18-8 SS
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421-04-6001 Through Hull Water Pickup.1 1/4" push-on through hull, cut to length pickups.
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421-04-6100 Through Hull Water Pickup-16 male fitting through hull, cut to length pickups.
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421-10-4020 Thrust Bearing (Clutch Spring)
2 per Upper Gear Assembly
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421-10-4044 Thrust Bearing (Gear)
2 per Upper Gear Assembly.
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This Part has options, please click the button below to order.
421-10-5045 + Option(s) Thrust Race (Specify Thickness)
2 per Upper Gear Assembly, one in the cap, one in the case.
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421-01-2590 Thrust Washer (.109 Thick)
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421-01-6579 Thrust Washer (7/16" Prop Adaptor)
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421-02-9189 Thumper ECM Bracket - Must order 1 of each bracket per engine. Also used with Powerflow LS Chevy exhaust.
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421-RGKT Thumper Manifold to Riser Gasket (each)
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421-TP-82KB Thumper Power - Black Big Block Exhaust System w/Shift Bracket
Are your cast iron manifolds failing? This could be
the answer. A cost effective lightweight entry level
performance system. This system was designed for efficiency
and reliability on stock originally equipped engines. Not
silent choice compatible.
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421-TPS82KBS Thumper Power - Black Small Block Exhaust System w/Shift Bracket
Here's an easy lightweight replacement for that
heavy cast iron stock system. This entry level
performance system is designed for stock engine application seeking
a slight performance increase as well as weight
reduction. Not silent choice compatible.
This kit includes the shift bracket.
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421-TP-82KP Thumper Power - Polished Big Block Exhaust System w/Shift Bracket
Are your cast iron manifolds failing? This could be
the answer. A cost effective lightweight entry level
performance system. This system was designed for efficiency
and reliability on stock originally equipped engines. Not
silent choice compatible.
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421-TPS82KPS Thumper Power - Polished Small Block Exhaust System w/Shift Bracket
Here's an easy lightweight replacement for that
heavy cast iron stock system. This entry level
performance system is designed for stock engine application seeking
a slight performance increase as well as weight
reduction. Not silent choice compatible.
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421-02-8093 Thumper Power Big Block Bolt KitBig Block kit, kit is for one manifold only.
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Kit Includes |
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| QTY |
Description |
P/N |
| 4 |
3/8-16 x 1 1/4" Bolt |
08-010806092 |
| 4 |
3/8-16 x 3 1/2" Bolt |
08-010806182 |
| 4 |
3/8-16 x 2 1/2" Stud |
08-030806141 |
| 4 |
3/8-16 Nut |
08-200806001 |
| 12 |
3/8" AN S/S Washer |
08-100800001 |
| 1 |
3/4 NPT to 1" Hose 90° |
09-2016 |
| 2 |
3/4 NPT Pipe Plug Brass |
09-2017 |
| 1 |
Riser Gasket |
11-1007 |
| 2 |
Compression Seal |
11-4003 |
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Riser Kit |
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| 1 |
3/4 NPT Pipe Plug Brass |
09-2017 |
| 1 |
3/4 NPT to 1" Hose Straight |
09-2015 |
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