M-6316-C351. Engine 302/351 HO, Balance 28.2 oz.-in.Damper has removable weight that allows use as a neutral balance unit for internally balanced crankshafts. 1994-01 Mustang and Explorer requires modification. Meets SFI 18-1 Does not clear early timing chain cover with rear installed seal. Mass (lbs) 11.5 3.000? overall length. NOTE: specs & photos may vary