{"product_id":"pro-series-chevy-big-block-bowtie-dart-merlin-pro-top-world-products-cylinder-head-12-point-bolt-kit","title":"Pro Series Chevy Big Block Bowtie \/ Dart \/ Merlin \/ Pro Top \/ World Products Cylinder Head 12-point Bolt Kit","description":"\u003cp\u003eUpgrade your Big Block Chevy build with the Top Street Performance Pro Series Big Block Chevy Cylinder Head 12-Point Bolt Kit. Designed for Bowtie, Dart, Merlin, Pro Top, and World Products cylinder head applications, this BBC head bolt kit provides the clamping force and durability needed to help maintain reliable head gasket sealing in street, performance, and racing engines. Whether you're assembling a fresh engine, upgrading aftermarket cylinder heads, or completing a rebuild, these Big Block Chevy cylinder head bolts deliver dependable fastening performance.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReliable Cylinder Head Clamping Force\u003c\/strong\u003e\u003cbr\u003eDesigned to securely fasten aftermarket cylinder heads to the engine block, this Big Block Chevy head bolt kit helps maintain consistent cylinder head clamping force and dependable head gasket retention. Ideal for engine rebuilds, cylinder head upgrades, and performance engine assembly projects.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Strength Performance Construction\u003c\/strong\u003e\u003cbr\u003eManufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI, these BBC head bolts are built to withstand demanding engine conditions. Threads are rolled after heat treatment and protected with a black oxide finish and oil coating for enhanced durability and corrosion resistance. TSP specifies a four-step torque procedure of 85 ft-lbs on long bolts and 75 ft-lbs on short bolts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned for Aftermarket Big Block Chevy Cylinder Heads\u003c\/strong\u003e\u003cbr\u003eEngine-specific design provides compatibility with Bowtie, Dart, Merlin, Pro Top, and World Products cylinder heads used on Chevrolet Big Block Mark IV engine applications. These performance Big Block Chevy head bolts are ideal for 396, 402, and 454 engine combinations utilizing compatible aftermarket cylinder heads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIdeal for Rebuilds \u0026amp; Performance Engine Builds\u003c\/strong\u003e\u003cbr\u003ePerfect for cylinder head installation, head gasket replacement, engine assembly, and racing engine projects where fresh cylinder head hardware is recommended. An excellent choice for maintaining proper head gasket sealing and long-term reliability in high-performance Big Block Chevy applications.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMPATIBLE WITH\u003c\/strong\u003e\u003cbr\u003eCHEVROLET BIG BLOCK V8\u003cbr\u003e• 6.5L \/ 396 in³\u003cbr\u003e• 6.6L \/ 402 in³\u003cbr\u003e• 7.0L \/ 427 in³\u003cbr\u003e• 7.4L \/ 454 in³\u003cbr\u003e• 8.1L \/ 496 in³ stroker combinations (application-specific verification required)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMMON USES\u003c\/strong\u003e\u003cbr\u003eBig Block Chevy Engine Rebuilds\u003cbr\u003eAftermarket Cylinder Head Installation\u003cbr\u003eHead Gasket Replacement\u003cbr\u003eStreet Performance Engines\u003cbr\u003eDrag Racing Builds\u003cbr\u003eMarine Engine Builds\u003cbr\u003eEngine Assembly Projects\u003cbr\u003eHigh-Compression BBC Builds\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTES\u003c\/strong\u003e\u003cbr\u003e• Designed for compatible aftermarket cylinder head applications.\u003cbr\u003e• Not compatible with Small Block Chevy engines.\u003cbr\u003e• Not compatible with LS or LT engine platforms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSPECIFICATIONS\u003c\/strong\u003e\u003cbr\u003eTorque: 4 steps, to 85 ft-lbs long, 75 ft-lbs short\u003cbr\u003eFastener Color: Black\u003cbr\u003eFastener Material: 35 Chromoly\u003cbr\u003eFastener Style: Bolt\u003cbr\u003eHead Style: 12-point\u003cbr\u003eQuantity: Sold as a kit\u003c\/p\u003e","brand":"Top Street Performance","offers":[{"title":"Default Title","offer_id":49818409664808,"sku":"722-82095","price":108.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/8356\/5608\/files\/722-82095_01_14779f41-b381-4b5e-a52b-64d591e00f9f.jpg?v=1739474679","url":"https:\/\/www.topstreetperformance.com\/products\/pro-series-chevy-big-block-bowtie-dart-merlin-pro-top-world-products-cylinder-head-12-point-bolt-kit","provider":"Top Street Performance","version":"1.0","type":"link"}