QUICKCHANGE GEARSET 1 3/8",10 SPLINE,#19, 21T/25T 1927-1934 Chassis 100% Brand New Premium ISO/TS

100% Brand New Premium ISO/TS 16949 Quality

1963-1965 GMC 1000 SERIES

Header Specifications:

15% STRONGER & RE-DESIGNED PORTS PROVIDE MORE FLOW & STRENGTH OVER STOCK CAST IRON HEADS

EIGHT CHROME PLATED STEEL 1/2" HEX HEAD X 1 3/8" LONG NUTS

QUICKCHANGE GEARSET 1 3/8",10 SPLINE,#19, 21T/25T 1927-1934 Chassis 100% Brand New Premium ISO/TSTOOTH COUNT: 21 25 PREMIUM QUALITY WINTERS QUICKCHANGE GEARS 10 SPLINE PRECISION MATCHED SETS TO FIGURE EXACT GEAR RATIO, 1ST GET THE SPUR RATIO *SPUR RATIO=TEETH ON TOP GEAR DIVIDED BY TEETH ON BOTTOM GEAR THEN FIGURE THE GEAR RATIO *GEAR RATIO=SPUR RATIO X R&P RATIO CLICK ON THE CHART AT THE RIGHT TO SEE THE RATIOS ON EACH GEAR SET INCLUDING THIS ONE