Set of two (2) high performance precision-machined, honed brass crankshaft seal inserts
. One of the key ways to improve engine performance is to reduce internal friction and drag
wherever possible. These inserts help the stock rubber crankshaft seals reduce their
"death grip" on the crankshaft, while still preventing all air and mixture leakage.
Testing has shown a typical performance gains of 200 to 300 useable RPMs.
Improves performance throughout the RPM range.