Fits most LS engines and meets SFI Specification 18.1, Free up horsepower over stock dampers, 30% more efficient abouve 5,000 rpm, CNC-machined and designed to mount to crank hub so timing marks never change position, Features inertial ring and hub, rebuild-able and tunable by replacing elastomer strips, Exposed inertial weight at TDC provide indicator that elastomer strips need replaced when marks start to move GM LS SFI Certified High Performance Harmonic Balancer Sku # 91021811 Mfr. Part # 91021811 Condition New Brand Speedway Motors Sold Each Details Info
Speedway Motor\'s LS Harmonic Balancer is 30% more efficient above 5,000 rpm and frees up horse power over stock dampers. The shell is CNC-machined and is designed to mount to the crank hub so the timing marks never change position. It features an inertia ring and hub and is rebuild-able and tunable by replacing the elastomer strips. As an added feature, with the exposed inertia weight marked at TDC, you can tell that the elastomer strips need replacing when the marks start to move. All-around, this harmonic balancer has been built to handle your high performance LS engine with ease.
- Fits most LS engines and meets SFI Specification 18.1
- Free up horsepower over stock dampers, 30% more efficient above 5,000 rpm
- CNC-machined and designed to mount to crank hub so timing marks never change position
- Features inertial ring and hub, rebuild-able and tunable by replacing elastomer strips
- Exposed inertial weight at TDC provide indicator that elastomer strips need replaced when marks start to move
Charts
(PDF)
Installation Tips CHEVROLET SMALL BLOCK V8 GEN. III/IV (LS BASED)
• 4.8 L / 293 in3
• 5.3 L / 325 in3
• 5.7 L / 346 in3
• 6.0 L / 364 in3
• 6.2 L / 376 in3
This balancer has a keyway
We do not offer a crank pulley, alternate can be sourced from Top Street Performance p#81200-1 Specs Sold in Quantity Each Material Type Steel Finish Painted Color Black Outside Diameter 6.325 SFI Rating 18.1 SFI Rated Yes Engine Balance Internal Degree Markings Yes Harmonic Balancer Construction Elastomer MFG. Part # 91021811 Reviews I'll buy it again Rated by LS man on September 25, 2021
Summary: Looks great and works great
Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 73 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
