Doss Heavy Duty Breaker Weight Springs For 1970-1999 B.T.(excl. TC) And 1971-2003 XL (With Mechanical Advanced Ign.) (13-9246)
The Heavy Duty version comes with stronger springs. These will give a slower advance curve, which may be beneficial for high compression engines with detonation issues. Will also give less rattle and improve idling stability.
