Chevy - Big Block

Normal stock dampers wear out and engine performance upgrades increase naturally occurring harmful crankshaft torsional vibrations. Install a Fluidampr viscous damper to reduce wear on the main bearings and timing gear, achieve more accurate valvetrain operation and lower the risk of crank failure. Unlike rubber based dampers, Fluidampr automatically adapts to any engine modifications and constantly self-tunes in real time to protect across the entire RPM range. Features precision machined and computer balanced components that never need to be tuned or rebuilt.

SFI Approved / ISO 9001 Certified / Made in the USA

Chevy Big Block

(396-427 CID V-8) Internally Balanced

PART # 620111
Fitment GM / Chevy Big Block. 396ci - 427ci. Internal balance.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance Internal
Finish Black Zinc
Keyway Single; (3/16")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 6-1/4"
Safety Rating SFI 18.1
Weight / Rotating Weight 8.9 lbs / 5.9 lbs


PART # 720121
Fitment Chevy Big Block (396-427). Internal balance.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance Internal
Finish Black Zinc
Keyway Single; (3/16")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 7-1/4"
Safety Rating SFI 18.1
Weight / Rotating Weight 12.8 lbs / 8.5 lbs


PART # 800101
Fitment Chevy Big Block 396-427ci. Internal balance.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance Internal
Finish Black Zinc
Keyway Single; (3/16")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 15.3 lbs / 10.2 lbs


PART # 800131
Fitment Chevy Big Block 396-427. Internal balance. Dual 3/16" and 1/4" keyways.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance Internal
Finish Black Zinc
Keyway Dual; (3/16", 1/4")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 15.3 lbs / 10.2 lbs


PART # 800151
Fitment Chevy Big Block 396-427ci. Internal balance. Dual 1/4" keyways.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance Internal
Finish Black Zinc
Keyway Dual; (1/4", 1/4")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 15.2 lbs / 10.1 lbs

Chevy Big Block

(454-502 CID V-8) Externally Balanced

PART # 800111
Fitment Chevy Big Block 454-502ci. External balance.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance External (34.5 oz)
Finish Black Zinc
Keyway Single; (3/16")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 17.1 lbs / 11.4 lbs


PART # 800121
Fitment Chevy Big Block 454-502ci. External balance. Dual 1/4" keyways.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance External (34.5 oz)
Finish Black Zinc
Keyway Dual; (1/4", 1/4")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 17.0 lbs / 11.3 lbs


PART # 800181
Fitment Chevy Big Block 454-502ci. External balance. Dual 3/16" and 1/4" keyways.
Bore Diameter Ø1.5990"
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings Engraved
Engine Balance External (34.5 oz)
Finish Black Zinc
Keyway Dual; (3/16", 1/4")
Length 2.685"
Material Steel
Mounting Hardware Included No
Outside Diameter 8"
Safety Rating SFI 18.1
Weight / Rotating Weight 17.0 lbs / 11.3 lbs