Ol' Ron Well-known member Jul 24, 2010 #1 Boring a Flathead depends on your age. 55 and under .060, ofer 55 .125, over 7o .182. and if your like Rumble seat, who is older than dirt. .250. And it still runs cool, nice torque motor .
Boring a Flathead depends on your age. 55 and under .060, ofer 55 .125, over 7o .182. and if your like Rumble seat, who is older than dirt. .250. And it still runs cool, nice torque motor .
