Engine Compatibility – Designed for Chevy 383 and 400 small block engines with external balance requirements, Lightweight Design – Weighs approximately 7.75 lbs to reduce rotating mass while maintaining durability, Steel Construction – Built from durable nodular iron with high-temperature elastomer bonding for reliable performance, Hidden Balance Cut – Rear-side balancing cutout conceals crank type for a clean installed appearance, Size & Rating – 6.75 inch outside diameter, 1.25 inch bore, press-on fit, degree marked and rated up to 6,500 RPM
Chevy 383-400 Lightweight Harmonic Balancer, 6-3/4Inch Speedway Motors
Chevy 383-400 Lightweight Harmonic Balancer, 6-3/4Inch
Sku # 91015364
Mfr. Part # 91015364
Condition
New
Brand
Speedway Motors
Sold
Each
Details

This 6-3/4" balancer fits 383/400 c.i. Small Block Chevys and only weighs 7-3/4 lbs. Plus, the balancing cut out is on the backside so they cant tell what crank youre running. Damper is a press-on fit.

  • Durable nodular iron construction
  • High temperature elastomer bond
  • This balancer is 1.20" thick
  • Rated to 6,500 RPM
  • NOT SFI approved 

Item Details

Externally Balanced

Specs
MFG. Part #
91015364
Outside Diameter
6.75"
Inside Diameter
1.25"
Overall Thickness
2.20"
SFI Rating
Not SFI-approved
Weight
7.75 lbs.
Material Type
Steel
Finish
Painted
Sold in Quantity
Each
Notes
Rated to 6,500 RPM
Engine Balance
External
Degree Markings
Yes
Reviews

Very nice Balancer

Rated
Product Rating
by Thumper on June 03, 2024

Summary: I purchased a new balancer for my 406 race engine.

Yes, I recommend this product.

383 STROKER/ 400 BALANCER

Rated
Product Rating
by Kurt on April 03, 2024

Summary: Bought Speedways 383 rotating assembly to upgrade my 350. It wasnt until I had my local machine shop attempt to balance my parts did I find out that the 400 crank used in kit is externally balanced, my 350 balancer will not work as the 350 is internally balanced. Not a big deal, just a time delay and education. Almost think the balancer should be part of the rotating assy kit.

Yes, I recommend this product.

Looks Great.

Rated
Product Rating
by Ken on March 12, 2020

Summary: Fits the space I have in my Nova with hitting aftermarket steering parts.

Yes, I recommend this product.

Excellent

Rated
Product Rating
by Ron on December 02, 2017

Summary: Super trick part

Yes, I recommend this product.

Much better than stock

Rated
Product Rating
by Racer X on July 26, 2011

Summary: I have had great luck with this balancer. I turn my claimer engines just over 7k rpm and have had more than one oem replacement balancers come apart. This balancer has the added benefit of looking like a 350 balancer so everyone does not know at a glance that you are running a 383 or 400. Once the pulley is on it looks factory other than the timing marks which can be painted over if you wanted.

Yes, I recommend this product.

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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 74 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.