Mopar Distributor Shaft Lengths

Mopar Distributor identification guide by measuring shaft length, measured from mounting surface to lower end of distributor shaft.

Mopar LA engine – 3.875
Mopar B engine – 3.5″
Mopar RB engine – 4″

Chrysler 331/354 Hemi – 4.25″
Chrysler 392 Hemi – 4.5″

Dodge 241/260/270 Hemi – 3.875
Dodge 315/325 Hemi – 4.25″
Desoto 276/291 Hemi – 4.00″