Assault Racing 8 350 Small Block Chevy Damper Internal Balance SFI Rated SBC. Assault Racing Products SFI Harmonic Balancer. Small Block Chevy V8 – Internally Balanced – SFI Approved. KMJ Performance is proud to sell the Assault Racing SB Chevy Harmonic Balancer! This balancer is a brand new SFI series harmonic damper that is 18.1 SFI Certified. It is intended for racing applications and high performance street applications to 10,000 RPM plus. This damper is 8″ in diameter and approximately 1-1/8″ thick. These are our most popular dampers for internally balanced small block Chevys. These dampers are dimensionally identical to the stock G. They have 60° of easy to read timing marks and engraved marks every 90 degrees. This race model weighs 9.3 pounds. If your order is sent in multiple boxes you will need to sign for each one. Domestic Customers Within the Lower 48 States. All international orders are sent to their warehouse in Kentucky, US, before being sent international. For further information on the program. Within the lower 48 states. All others will be additional. Some items are not combined due to size or weight such as crankshafts, torque converters, radiators, cylinder heads, etc. Powered by SixBit’s eCommerce Solution.