Prepare for an amazing DIY project where used 42-size motorcycle gears are transformed into a functional manual pulley. This ...

New CFR Engine Bracket and Pulley Kit Installation - Pulleys For Your Small Block Dressing up your drive system on a budget Saul VargasWriterJun 29, 2013 See All 2 Photos See All 2 Photos ...

This 350 small-block Chevy is typical of what's under the hood of many hot rods. Originally, it ran a V-belt system, but V-belts tend to slip when the horsepower gets ratcheted up too far.

Q: What about tracking on longer stretches of belt? A: On drives with a center distance greater than 10 times the diameter of the small pulley, additional flanged idlers may be required.

Think of each drive pulley as a small crank pulley and the driven pulley as the larger-alternator pulley intended to slow the speed of the alternator. A smaller-drive pulley reduces overall speed.

Low-horsepower drives with small pulleys are usually more expensive than comparable V-belt drives. But once the larger pulley diameter reaches 30 in., flat-belt drives become less expensive.