302/351W PERFORMANCE CRANKSHAFT DAMPER PART NUMBER ENGINE BALANCE NOTES MASS (LBS) M-6316-A50** 302 (1981-93) 50 oz.-in. Meets SFI 18-1 1,2,3,5 12.1 M-6316-C351* 302/351W 28.2 oz.-in. Meets SFI 18-1 1,2,3,6 11.5 M-6316-A460* 429/460 Neutral Meets SFI 18-1 10.1 M-6316-A521* 514/521 Neutral Meets SFI 18-14 10.1 M-6316-D302* 302/351W Neutral Meets SFI 18-13,6 10.6 NOTES: 1 Damper has removable weight that allows use as a neutral balance unit for internally balanced crankshafts. 1994-01 Mustang and Explorer requires modification. 2 Does not clear early timing chain cover with rear installed seal. 3 3.000-inch. overall length 4 Tuned for use on 521 crate engine. 5 Passenger side 11-o'clock timing marks only. 6 Passenger side 11-o'clock timing marks and drivers side 2-o'clock timing marks