CH 3 and 4 Belt Drive Counter Rotator w/Blackhawk Belt

CH 3 Counter Rotator Reduction Unit with Blackhawk Belt Ratios available are 2:1 & 2.3:1.  The CH-3 Counter Rotating drive units are designed for a large block GM, Chevrolet, and Cadillac engines. The CH-3 Counter Rotating models can bolt to GM V-8, Small Block, V-8 Big Block. CH-3 Counter Rotating models are used on 16' and larger airboats. The CH-3 Counter Rotating drive units have many benefits. When using the Counter Rotating drive units you can increase your thrust by about 30% and reduce noise levels by 25%. PLEASE SPECIFY WHAT ENGINE THIS WILL BE USED FOR