Personally I like the 126 S&S shorter stroke larger bore better rod angle.
http://www.starracing.com/vspecials.php Dyno runs have the 126 making over 150 rear wheel horsepower & it delivers the most torque of any engine in its class - over 145 ft. lbs. These 4-3/8" bore engines have similar general specifications to the original S&S Tribute 145 engines, but the new G Squared 126 is a dual cam design combined with big valve B2 heads for ultimate performance.
For the rider who tours from sunup to sundown, the 126 delivers the massive horsepower you crave, in an engine that bolts directly into stock chassis from 1999 and up, and is available with an S&S G or D carburetor or Fuel Injection. The 126 is offered exclusively through G2 Motorsports and its dealer network and are NOW IN STOCK.