The CH-3 Air boat Belted Reduction Drive Unit is designed for a large block GM, Chevrolet, and Cadillac engine
The CH-3 models are similar to the CH-2 models but are stronger and use a wider belt.
The CH-3 models can bolt to GM V-8, Small Block, V-8 Big Block, and GM Diesels.
CH-3 models are used on 15' and larger air boats.
The drive belts for CH-3 models are 5" wide and can use HPPD Plus or Black hawk belts which are rated 60% stronger than the standard HPPD Plus style.
The available ratios for a CH-3 belted air boat drive unit are:
1.5 to 1, 1.774 to 1, 2 to 1, 2.3 to 1