{"id":6944440320185,"title":"Howards Cams 91171 ProMax High RPM Retro-Fit BBC Hydraulic Roller Lifters","handle":"hrc91171","description":"\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams designed these 91171 ProMax High RPM Retro-Fit Hydraulic Roller Lifters for Big Block Chevy Mark IV and Gen 5\/6 engines, specifically for applications operating at over 7000 rpm.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eThese lifters have nose wheels machined from case hardened 8620 steel for durability. Fully machined from alloy steel bar stock, the lifter bodies feature all-new internal valving for increased RPM, torque and horsepower. \u003cspan style=\"mso-spacerun: yes;\"\u003e \u003c\/span\u003e\u003cspan style=\"mso-spacerun: yes;\"\u003e \u003c\/span\u003e\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=\"color: #000000;\"\u003e\u003cb\u003e\u003cu\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eNote:\u003c\/span\u003e\u003c\/u\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003e Spring pressure requirements are 200-225 lbs. seat pressure and 500-575 lbs. open pressure. Specific lash adjustments are also required.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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\u003cspan style=\"color: #000000;\"\u003e\u003cb\u003e\u003cu\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams 91171 ProMax High RPM Retro-Fit Hydraulic Roller Lifters Specs:\u003c\/span\u003e\u003c\/u\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan style=\"font-size: 13.5pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eFits Big Block Chevy Mark IV and Gen 5\/6 engines \u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Style: Hydraulic Roller\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eBody Diameter: 0.842 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Body Height: +.300 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Intake Offset: Center\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Exhaust Offset: Center\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Wheel Diameter: 0.750 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Seat Height: 2.663 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Bar Type: Vertical\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eQuantity: Sold as a set of 16 \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=\"color: #000000;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams produces high-performance cams as well as valve train components designed to boost the performance of a number of different V6 and V8 engines. They also manufacture several other engine parts such as connecting rods, crankshafts, and more, all built with the same passion and precision that has made Howards an industry leader for over 70 years.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eHowards Cams designed these Lifters for high performance on the street as well as the dragstrip.\u003c\/span\u003e\u003c\/p\u003e","published_at":"2026-09-22T11:18:23-05:00","created_at":"2021-09-04T14:46:28-05:00","vendor":"HOWARDS RACING COMPONENTS","type":"Lifters","tags":["Camshaft","Howards Cams","lifters"],"price":135446,"price_min":135446,"price_max":135446,"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":40905434726585,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"HRC91171","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Howards Cams 91171 ProMax High RPM Retro-Fit BBC Hydraulic Roller Lifters","public_title":null,"options":["Default Title"],"price":135446,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"840793119660","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.winnerscircle.com\/cdn\/shop\/products\/91171-HWC_8a36aa5a-72c0-472b-9986-b57583d8ba8c.jpg?v=1630788828"],"featured_image":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/91171-HWC_8a36aa5a-72c0-472b-9986-b57583d8ba8c.jpg?v=1630788828","options":["Title"],"media":[{"alt":"Howards Cams 91171 ProMax High RPM Retro-Fit Hydraulic Roller Lifters, Big Block Chevy Mark IV \u0026 Gen 5\/6 engines, 0.842 in. OD, +0.300” height, set of 16","id":22493275160761,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/91171-HWC_8a36aa5a-72c0-472b-9986-b57583d8ba8c.jpg?v=1630788828"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.winnerscircle.com\/cdn\/shop\/products\/91171-HWC_8a36aa5a-72c0-472b-9986-b57583d8ba8c.jpg?v=1630788828","width":800}],"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=\"color: #000000;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams designed these 91171 ProMax High RPM Retro-Fit Hydraulic Roller Lifters for Big Block Chevy Mark IV and Gen 5\/6 engines, specifically for applications operating at over 7000 rpm.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eThese lifters have nose wheels machined from case hardened 8620 steel for durability. Fully machined from alloy steel bar stock, the lifter bodies feature all-new internal valving for increased RPM, torque and horsepower. \u003cspan style=\"mso-spacerun: yes;\"\u003e \u003c\/span\u003e\u003cspan style=\"mso-spacerun: yes;\"\u003e \u003c\/span\u003e\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=\"color: #000000;\"\u003e\u003cb\u003e\u003cu\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eNote:\u003c\/span\u003e\u003c\/u\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003e Spring pressure requirements are 200-225 lbs. seat pressure and 500-575 lbs. open pressure. Specific lash adjustments are also required.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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\u003cspan style=\"color: #000000;\"\u003e\u003cb\u003e\u003cu\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams 91171 ProMax High RPM Retro-Fit Hydraulic Roller Lifters Specs:\u003c\/span\u003e\u003c\/u\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan style=\"font-size: 13.5pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eFits Big Block Chevy Mark IV and Gen 5\/6 engines \u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Style: Hydraulic Roller\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eBody Diameter: 0.842 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Body Height: +.300 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Intake Offset: Center\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Exhaust Offset: Center\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Wheel Diameter: 0.750 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Seat Height: 2.663 in.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eLifter Bar Type: Vertical\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"color: black; 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-size: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eQuantity: Sold as a set of 16 \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=\"color: #000000;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: 'Times New Roman', serif;\"\u003eHowards Cams produces high-performance cams as well as valve train components designed to boost the performance of a number of different V6 and V8 engines. They also manufacture several other engine parts such as connecting rods, crankshafts, and more, all built with the same passion and precision that has made Howards an industry leader for over 70 years.\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman';\"\u003e\u003c\/span\u003e\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: 12pt; font-family: 'Times New Roman', serif; color: #000000;\"\u003eHowards Cams designed these Lifters for high performance on the street as well as the dragstrip.\u003c\/span\u003e\u003c\/p\u003e"}