1) Fits For Small Block Chevy 283 305 327 350 383 400 Engines.

2) Made Of High-Grade Aluminum.

3) Designed To Work With Long Water Pumps With Up To A 5/8" Shaft.

4) The Cogged 1 1/2" Wide "Gilmer" Style Belt Prevents Slippage. The Water Pump And Crankshaft Pulleys Have A 1:1 Ratio. 

5) Work With The Factory Alternator Position, The Alternator Pulley Has External Lips To Keep The Belt Aligned.

6) A Crank Pulley With A V-Belt Groove Can Run Power Steering. 

7) Note: Only Works With Mechanical Water Pumps. Not Use With A/C Equipped Vehicles & Electric Water Pumps. 

8) Package Includes: As Shown In Our Pictures.

This Item Doesn't Come With Installation Guides. We Highly Recommend Professional Installation.