Compatible with all Chevrolet Gen 1 & 2 Small Block Engines 265 283 305 307 327 350 366 383 400 Compatible with all Chevrolet Big Block Engines 396 402 409 427 454 472 502 Comes with 4ea Flange 3/8-16x3”, 4ea Flange 3/8-16x3.5”, and 4ea 3/8” Thick washers all Clear Zinc Coated to Prevent Rust and Corrosion. When you purchase Z Whip Parts you will always get the highest quality for your vehicle that you rightfully deserve We are an AS9100D and ISO 9001:2015 Certified Manufacturer that produces aerospace parts for The Boeing Aircraft Company and The US Military. Parts we produce fly at 30,000 feet where failure is not an option. We put the same quality into every part we produce. Z Whip SAE Engine Stand Bolt Kit. Comes with 4ea Flange 3/8-16x3”, 4ea Flange 3/8-16x3.5”, and 4ea 3/8” Thick washers all Clear Zinc Coated to Prevent Rust and Corrosion. These will fit many older engines that use 3/8”-16 bell housing bolts including all Chevrolet Gen 1 & 2 Small Block Engines and all Chevrolet Big Block Engines.