Top Street Performance Pro Series Cylinder Head 12-point Bolt Kit for Chevy Big Block Bowtie/Dart/Merlin/Pro Top/World Products

TSP's fasteners are composed of 35 chromoly steel for a minimum tensile strength of 190,000 PSI. Threads are rolled after heat treatment and then tested for tensile and yield strength. All hardware is then given a black oxide finish and oil coating to protect from rust and corrosion.COMPATIBLE WITHCHEVROLET BIG BLOCK V8 6.5L / 396 in³ 6.6L / 402 in³ 7.0L / 427 in³ 7.4L / 454 in³ 8.1L / 496 in³ stroker combinations (application-specific verification required)COMMON VEHICLE APPLICATIONSChevrolet Chevelle / El Camino (Big Block equipped)Chevrolet Camaro (Big Block equipped or swapped)Chevrolet C10 / C/K Trucks (Big Block equipped)Chevrolet Impala / Caprice (Big Block equipped)Marine, street/strip, and performance Big Block Chevy buildsNOTESDesigned for Big Block Chevy engine platforms.Intended for aftermarket Bowtie / Dart / Merlin / Pro Top / World Products-style cylinder heads.Verify cylinder head generation, port style, fastener length, washer requirements, and torque specifications before installation.Not compatible with Small Block Chevy, LS, or LT engine platforms.SPECIFICATIONSTorque: 4 steps, to 85 ft-lbs long, 75 ft-lbs shortFastener Color: BlackFastener Material: 35 ChromolyFastener Style: BoltHead Style: 12-pointQuantity: Sold as a kit

• Fits Chevy Big Block Mark IV applications including 396, 402, 427 and 454 engines
• Bolt kit with 12-point hardware and 35 Chromoly construction for performance engine builds
• Provides strong, consistent clamping force to support head gasket sealing and cylinder pressure control
• Application-specific torque procedure listed in specs: 4 steps, to 85 ft-lbs long, 75 ft-lbs short