{"title":"Manley Performance","description":"\u003cdetails style=\"margin: 0 0 16px 0; border: 1px solid #e5e5e5; border-radius: 6px;\"\u003e\u003csummary style=\"cursor: pointer; padding: 10px 14px; font-weight: 600; background: #f7f7f7;\"\u003eAbout Manley Performance — Read More\u003c\/summary\u003e\u003cdiv style=\"padding: 14px;\"\u003e\n\u003ch2\u003eManley Performance — Engine Internals for Built Motors\u003c\/h2\u003e\n\u003cp\u003eManley Performance has been forging high-strength engine internals in New Jersey since 1958 — supplying connecting rods, pistons, valves, springs and complete rotating assemblies to NHRA Pro Stock, NASCAR Cup, IndyCar, World of Outlaws and the world's most respected engine builders. SP Engineering carries the full Manley range with 2,700+ application-specific fitments.\u003c\/p\u003e\n\u003ch3\u003eManley Product Lines\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eH-Beam \u0026amp; H-Tuff Connecting Rods\u003c\/strong\u003e — 4340 forged steel rods rated to 600-1,200+ HP depending on application. The standard for naturally-aspirated and boosted builds. \u003cstrong\u003eTurbo Tuff I-Beam\u003c\/strong\u003e — Pro-spec rods for extreme boost applications. \u003cstrong\u003ePlatinum Series Pistons\u003c\/strong\u003e — Forged 2618 alloy with skirt coatings, race-spec pin towers and custom dish\/dome options. \u003cstrong\u003ePerformance Valves\u003c\/strong\u003e — NexTek dual-pattern, Severe Duty stainless and titanium retainers. \u003cstrong\u003eNexTek Valve Springs\u003c\/strong\u003e — Single, dual and beehive springs with race-tested rate options. \u003cstrong\u003eComplete Rotating Assemblies\u003c\/strong\u003e — Balanced kit with crank, rods, pistons, bearings, rings.\u003c\/p\u003e\n\u003ch3\u003ePopular Engine Fitments\u003c\/h3\u003e\n\u003cp\u003eHonda B-series (B16, B18), K-series (K20, K24, K24Z); Nissan SR20DET, KA24DE, RB25DET, RB26DETT, VR38DETT, VQ35DE; Toyota 2JZ-GTE\/GE, 1JZ, 4A-GE, 3SGE, 3UR-FE, 2GR-FE; Mazda B6T (Miata), 13B Rotary; Mitsubishi 4G63T, 4B11T; Subaru EJ20, EJ25, EJ257; Ford 5.0L Coyote, 4.6L\/5.4L Modular, EcoBoost; GM LS1–LS7, LSA, LT1\/LT4, 2.0L Ecotec; Chrysler 6.4L Hemi, 6.2L Hellcat; BMW S54, S62, S65, S85, N54, N55.\u003c\/p\u003e\n\u003ch3\u003eBuilt-Motor Spec Help\u003c\/h3\u003e\n\u003cp\u003eEmail \u003ca href=\"mailto:sales@sp-power.com\"\u003esales@sp-power.com\u003c\/a\u003e with your engine, target power, fuel grade and intended use (street, drag, road race, drift). We'll spec rod material\/length, piston dish\/dome, valve spring rate and bearing clearances.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSP Engineering — Authorized Manley Performance dealer since 1996.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/details\u003e","products":[{"product_id":"manley-chevy-small-block-2-055in-dia-3415-stem-dia-street-master-intake-valves-set-of-8","title":"Manley Chevy Small Block 2.055in Dia .3415 Stem Dia Street Master Intake Valves (Set of 8)","description":"High-Quality Stainless Steel: Our Street Series valves, available as XH-424 for exhaust and NK-841 for intake, are crafted from top-grade stainless steel, ensuring durability and longevity.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485453627497,"sku":"MAN10754-8","price":139.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853.jpg?v=1674341703"},{"product_id":"manley-chevy-small-block-2-055in-dia-street-master-intake-valves-set-of-8","title":"Manley Chevy Small Block 2.055in Dia Street Master Intake Valves (Set of 8)","description":"High-Quality Stainless Steel: Our Street Series valves, available as XH-424 for exhaust and NK-841 for intake, are crafted from top-grade stainless steel, ensuring durability and longevity.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485453660265,"sku":"MAN10756-8","price":139.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_9e21a23e-4eea-4cd3-88a7-de5c2e89e973.jpg?v=1674341705"},{"product_id":"manley-chevy-small-block-severe-duty-valves-set-of-8","title":"Manley Chevy Small Block Severe Duty Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485454250089,"sku":"MAN11231-8","price":301.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_2f2ac1c0-6066-4c46-bf3c-112509bab9ac.jpg?v=1674341728"},{"product_id":"manley-chevy-small-block-severe-duty-valves-2-020in-head-dia-5-010in-oa-l-set-of-8","title":"Manley Chevy Small Block Severe Duty Valves 2.020in. Head Dia. \/ 5.010in. OA L (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485454315625,"sku":"MAN11232-8","price":301.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_cdc2c9d6-3b35-41eb-851e-a981433d9ef7.jpg?v=1674341730"},{"product_id":"manley-chrysler-426-hemi-race-master-exhaust-valves-set-of-8","title":"Manley Chrysler 426 Hemi Race Master Exhaust Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default 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Engineered to cater to the demanding needs of Top Fuel and Funny Car drag racers, Big Block Chevy marine enthusiasts, and Small Block Chevy restricted carburetor circle track competitors, these valves are your ticket to unparalleled performance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455167593,"sku":"MAN11507-8","price":489.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_38569d27-5e82-48a8-b494-94b6e3c1b543.jpg?v=1674341762"},{"product_id":"manley-big-block-chevy-stock-3-8in-stem-diameter-race-flo-intake-valves-set-of-8","title":"Manley Big Block Chevy Stock 3\/8in Stem Diameter Race Flo Intake Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455233129,"sku":"MAN11514-8","price":188.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_c587add2-bf45-4e58-aa32-0bdd36ee07db.jpg?v=1674341764"},{"product_id":"manley-big-block-chevy-stock-3-8in-stem-diameter-race-flo-exhaust-valves-set-of-8","title":"Manley Big Block Chevy Stock 3\/8in Stem Diameter Race Flo Exhaust Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455265897,"sku":"MAN11517-8","price":188.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_99638d7f-501a-4e0f-a1a2-773cb18c569a.jpg?v=1674341766"},{"product_id":"manley-426-hemi-2-250-intake-310inch-stem-5-490inch-length-stainless-intake-valves-set-of-8","title":"Manley 426 HEMI 2.250 Intake .310inch Stem 5.490inch Length Stainless Intake Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455331433,"sku":"MAN11518-8","price":202.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_37915783-f7f8-465a-9623-f0a9549c5c0d.jpg?v=1674341768"},{"product_id":"manley-big-block-chevy-stock-3-8in-stem-diameter-severe-duty-intake-valves-set-of-8","title":"Manley Big Block Chevy Stock 3\/8in Stem Diameter Severe Duty Intake Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455396969,"sku":"MAN11520-8","price":301.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_b34928c8-a959-4469-8bf1-45a7f5c2e472.jpg?v=1674341770"},{"product_id":"manley-small-block-chevy-1-500in-head-diameter-race-flo-exhaust-valves-set-of-8","title":"Manley Small Block Chevy 1.500in Head Diameter Race Flo Exhaust Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455462505,"sku":"MAN11521-8","price":188.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_d46b29a5-3fb5-4724-90bd-eb251d27eec4.jpg?v=1674341773"},{"product_id":"manley-chevy-small-block-1-940in-head-diameter-race-flo-intake-valves-set-of-8","title":"Manley Chevy Small Block 1.940in Head Diameter Race Flo Intake Valves (Set of 8)","description":"Manley?s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455528041,"sku":"MAN11522-8","price":188.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_3c00c5e4-b8bb-4160-b957-6afea1a36244.jpg?v=1674341775"},{"product_id":"manley-chevrolet-big-block-severe-duty-pro-flo-5-325in-o-a-length-intake-valves-set-of-8","title":"Manley Chevrolet Big Block Severe Duty\/Pro Flo 5.325in O\/A Length Intake Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455560809,"sku":"MAN11530-8","price":311.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_67c079c9-ccda-4aac-92c3-27de12c20f0c.jpg?v=1674341777"},{"product_id":"manley-sbc-1-600-severe-duty-exhaust-valves-set-of-8","title":"Manley SBC 1.600 Severe Duty Exhaust Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455626345,"sku":"MAN11543-8","price":301.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_6e7d7236-8f40-4287-adb2-c2bb8d7c83e0.jpg?v=1674341779"},{"product_id":"manley-sbc-2-020-severe-duty-intake-valves-set-of-8","title":"Manley SBC 2.020 Severe Duty Intake Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":40485455691881,"sku":"MAN11544-8","price":311.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2600\/1038\/products\/5f4b70fa0b8a870e0877005e4b8d1853_0eb20c63-4bbb-46f2-8f5b-0bcc1765d4ed.jpg?v=1674341781"},{"product_id":"manley-chevy-big-block-stock-3-8-inch-severe-duty-intake-valves-set-of-8","title":"Manley Chevy Big Block Stock 3\/8 inch Severe Duty Intake Valves (Set of 8)","description":"Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. 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