1981 hammond challenger , with an alpha one r drive 1.5 ratio, stock 23 pitch cleaver , boat is 21' 2800lbs loaded , with merc 260 hp i was running 60mph gps @ 4700 rpm with this set up .
Changes for this year 330hp vortec350 , roller cam, 9.3:1 comp, balanced, rpm range of 1200 to 5200 max...