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{"id":4849835147342,"title":"ARP 145-3901 Mopar Head Bolt Kit","handle":"arp145-3901","description":"\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eThis ARP 145-3901 Mopar Pro Series cylinder head bolt kit comes with a reduced wrenching 12 point head. This eliminates the need for valve train removal to facilitate cylinder head retorquing. These Pro Series bolts are 220,000 psi (which is 15% stronger than Grade 8)! Kits come complete with hardened parallel-ground washers. Sold as a set of 30.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-outline-level: 3;\"\u003e\u003cstrong\u003e\u003cu\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eARP 145-3901 Mopar Head Bolt Kit Features:\u003c\/span\u003e\u003c\/u\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eFits 426 Factory Hemi\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eAlso Fits Mopar 426-472-528 Hemi Crate Motor with factory heads or Edelbrock Hemi Victor Jr heads\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eTwo Lengths\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003e12 Point Head\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eARP2000 - 220,000 PSI\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eWhich is better, cylinder head studs or bolts? The answer depends on the installation. On many street-driven vehicles, master cylinders and other items protrude into the engine compartment. It’s probably necessary to use head bolts so the cylinder heads can be removed with the engine in the car.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eThe ARP 145-3901 Mopar Head Bolt Kit is perfect for that application!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eStuds also provide more accurate and consistent torque loading. Using studs ensures easier engine assembly, and proper alignment of both the cylinder head and gasket.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eHere’s why: when you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eInstall a stud in a “relaxed” mode – never crank it in tightly using a jammed nut. Always install the stud hand tight! Then, when applying torque to the nut, the stud will stretch only on the vertical axis.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eRemember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. \u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 16px;\"\u003eBecause the head gasket may compress,\u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 16px;\"\u003e \u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003echeck with your gasket manufacturer for retorquing requirements.\u003c\/span\u003e\u003c\/p\u003e","published_at":"2020-10-08T16:33:55-05:00","created_at":"2020-10-08T16:33:56-05:00","vendor":"ARP","type":"Cylinder Head Fasteners","tags":["ARP","Cut to Fit: No","Cylinder Head Style (application): Hemi","Engine Size and Year: 7.0L\/426 Hemi 1964-71","Fastener Finish: Black oxide","Fastener Material: Chromoly","Fastener Style: Bolt","Head Style: Hex","Make: Mopar","Quantity: Sold as Kit","Thread Size: 7\/16 in.","Undercut Stud: No","Washers Included: Yes"],"price":27899,"price_min":27899,"price_max":27899,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":32666515308622,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"ARP145-3901","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"ARP 145-3901 Mopar Head Bolt Kit","public_title":null,"options":["Default Title"],"price":27899,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"672036029760","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.winnerscircle.com\/cdn\/shop\/products\/145-3901Cover.jpg?v=1670428128","\/\/www.winnerscircle.com\/cdn\/shop\/products\/ARP145-3901_47d46145-a546-4599-8665-5cac25f16074.jpg?v=1670428128"],"featured_image":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/145-3901Cover.jpg?v=1670428128","options":["Title"],"media":[{"alt":null,"id":31597666140385,"position":1,"preview_image":{"aspect_ratio":0.993,"height":1829,"width":1817,"src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/145-3901Cover.jpg?v=1670428128"},"aspect_ratio":0.993,"height":1829,"media_type":"image","src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/145-3901Cover.jpg?v=1670428128","width":1817},{"alt":"ARP 145-3901 Mopar Hemi Cylinder Head Bolt High Performance Kit, 220,000 PSI, 12 Point Head, Two Lengths, includes hardened washers","id":8031925043278,"position":2,"preview_image":{"aspect_ratio":1.39,"height":900,"width":1251,"src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/ARP145-3901_47d46145-a546-4599-8665-5cac25f16074.jpg?v=1670428128"},"aspect_ratio":1.39,"height":900,"media_type":"image","src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/ARP145-3901_47d46145-a546-4599-8665-5cac25f16074.jpg?v=1670428128","width":1251}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eThis ARP 145-3901 Mopar Pro Series cylinder head bolt kit comes with a reduced wrenching 12 point head. This eliminates the need for valve train removal to facilitate cylinder head retorquing. These Pro Series bolts are 220,000 psi (which is 15% stronger than Grade 8)! Kits come complete with hardened parallel-ground washers. Sold as a set of 30.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-outline-level: 3;\"\u003e\u003cstrong\u003e\u003cu\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eARP 145-3901 Mopar Head Bolt Kit Features:\u003c\/span\u003e\u003c\/u\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eFits 426 Factory Hemi\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eAlso Fits Mopar 426-472-528 Hemi Crate Motor with factory heads or Edelbrock Hemi Victor Jr heads\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eTwo Lengths\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003e12 Point Head\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003eARP2000 - 220,000 PSI\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eWhich is better, cylinder head studs or bolts? The answer depends on the installation. On many street-driven vehicles, master cylinders and other items protrude into the engine compartment. It’s probably necessary to use head bolts so the cylinder heads can be removed with the engine in the car.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eThe ARP 145-3901 Mopar Head Bolt Kit is perfect for that application!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eStuds also provide more accurate and consistent torque loading. Using studs ensures easier engine assembly, and proper alignment of both the cylinder head and gasket.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eHere’s why: when you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eInstall a stud in a “relaxed” mode – never crank it in tightly using a jammed nut. Always install the stud hand tight! Then, when applying torque to the nut, the stud will stretch only on the vertical axis.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003eRemember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. \u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 16px;\"\u003eBecause the head gasket may compress,\u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 16px;\"\u003e \u003c\/span\u003e\u003cspan style=\"font-family: 'Times New Roman', serif; font-size: 12pt;\"\u003echeck with your gasket manufacturer for retorquing requirements.\u003c\/span\u003e\u003c\/p\u003e"}

ARP 145-3901 Mopar Head Bolt Kit

Product Description
$278.99
Maximum quantity available reached.

This ARP 145-3901 Mopar Pro Series cylinder head bolt kit comes with a reduced wrenching 12 point head. This eliminates the need for valve train removal to facilitate cylinder head retorquing. These Pro Series bolts are 220,000 psi (which is 15% stronger than Grade 8)! Kits come complete with hardened parallel-ground washers. Sold as a set of 30.

ARP 145-3901 Mopar Head Bolt Kit Features:

  • Fits 426 Factory Hemi
  • Also Fits Mopar 426-472-528 Hemi Crate Motor with factory heads or Edelbrock Hemi Victor Jr heads
  • Two Lengths
  • 12 Point Head
  • ARP2000 - 220,000 PSI

Which is better, cylinder head studs or bolts? The answer depends on the installation. On many street-driven vehicles, master cylinders and other items protrude into the engine compartment. It’s probably necessary to use head bolts so the cylinder heads can be removed with the engine in the car.

The ARP 145-3901 Mopar Head Bolt Kit is perfect for that application!

Studs also provide more accurate and consistent torque loading. Using studs ensures easier engine assembly, and proper alignment of both the cylinder head and gasket.

Here’s why: when you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously.

Install a stud in a “relaxed” mode – never crank it in tightly using a jammed nut. Always install the stud hand tight! Then, when applying torque to the nut, the stud will stretch only on the vertical axis.

Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket may compress, check with your gasket manufacturer for retorquing requirements.

Sku: ARP145-3901
Vendor: ARP