S Series 170a racing alt - 63-85 GM - 1 wire - Polished 4.3L these units use less horsepower

these units use less horsepower per Kw produced than conventional 3 phase alternators

and will require a slightly shorter drive belt for proper belt tension

We have included a removable mounting plate (2 Screws) for users who opt out of mounting their control knob

Newly redesigned for 2015

The S series of 6 phase hairpin stator alternators offers incredible output in a compact and durable package

S Series 170a racing alt - 63-85 GM - 1 wire - Polished 4.3L these units use less horsepowerThe S series of 6 phase alternators offers incredible low RPM output in a compact and durable package. Highly efficient, these units use less horsepower than conventional 3 phase alternators. 12 diodes, twin rectifier plates and outstanding airflow ensure much better durability than standard Delco based alternators, even in severe conditions. This custom designed housing directly replaces standard Delco 10DN, 10SI and 12SI alternators on most 1963