Quick view Mechman 170 amp racing alternator for 1963-1985 GM - BLACK (includes 2 pulleys) Now: $374.00 MSRP: $474.00 Was: The S series of 6 phase hairpin 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 plat… Add to Cart The item has been added Add To Compare