The Powerforce line of balancers are intended for non-SFI high performance applications. Although primarily meant for street use, these balancers are also suitable for racing applications where there is no requirement to meet SFI specifications.
It is not recommended to use these balancers in excess of 6,500RPM. Also, they are not recommended for marine or circle track applications due to excessive heat generated. While high temp elastomer is used in every balancer, certain applications are not suitable.
The 454 and 502 big block Chevy's require an externally balanced balancer. This 8" balancer is identical to the 80004 with the addition of a bolt-in counter-weight which provides the correct imbalance for externally balanced big block Chevrolets. Made of tough nodular iron, these balancers are a very affordable, street performance unit.