IMCO Marine

Thrust Bearing (Clutch Spring)

2 per Upper Gear Assembly

Thrust Bearing (Gear)

2 per Upper Gear Assembly.

Thrust Race (Specify Thickness)

2 per Upper Gear Assembly, one in the cap, one in the case.

Thrust Washer (.109 Thick)

Thrust Washer (7/16" Prop Adaptor)

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.

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.

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.

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.

To view and download the PDF line drawing Right Side  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

Thumper Power Big Block Manifold & Riser Kit Black (Sold in pairs)
IMCO's affordable alternative to stock cast iron Chevy manifolds and risers. Our all cast aluminum manifolds and risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Available with optional hard anodize for corrosion protection (prior to powder coat). Weld on or Bolt on brackets for Shift, ECM or EFI, see Thumper Power Accessories or Related Products.

Shift and ECM-EFI brackets are available, go to "Thumper Power Accessories" or "Related Products" at the right side of you screen.

Thumper Power Big Block Manifolds (Black)(Sold in pairs)

IMCO's affordable alternative to stock cast iron Chevy manifolds. Our all cast aluminum manifolds will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.

Thumper Power Big Block Manifolds (Polished) (Sold in pairs)

IMCO's affordable alternative to stock cast iron Chevy manifolds. Our all cast aluminum manifolds will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.

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Thumper Power Risers (Black)

IMCO's affordable alternative to stock cast iron Chevy risers. Our all cast aluminum risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.
When using these risers, it's best to order 2 each 02-2242 oval hoses for wishbone connections.

Thumper Power Risers (Polished) (Sold in pairs)

IMCO's affordable alternative to stock cast iron Chevy risers. Our all cast aluminum risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.
When using these risers, it's best to order 2 each 02-2242 oval hoses for wishbone connections.

Small Block kit, kit is for one manifold only.

Thumper Power Small Block Manifold & Riser Kit Black (Sold in pairs)
Not compatible with - SoundAdvantage - Silent Choice - Corsa Quick & Quiet.
Use PowerFlow Manifolds with SA Risers
To view and download the PDF line drawing Left Side  CLICK HERE

To view and download the PDF line drawing Right Side  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

Thumper Power Small Block Manifold & Riser Kit Black (Sold in pairs)
IMCO's affordable alternative to stock cast iron Chevy manifolds and risers. Our all cast aluminum manifolds and risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Available with optional hard anodize for corrosion protection (prior to powder coat).

Shift and ECM-EFI brackets are available, go to "Thumper Power Accessories" or "Related Products" at the right side of your screen.

To view and download the PDF line drawing Right Side  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

Thumper Power Small Block Manifold & Riser Kit Polished (Sold in pairs)
IMCO's affordable alternative to stock cast iron Chevy manifolds and risers. Our all cast aluminum manifolds and risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater.

Shift and ECM-EFI brackets are available, go to "Thumper Power Accessories" or "Related Products" at the right side of you screen.