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You will need 2 sets to do a whole cylinder head.\u003c\/p\u003e\n\u003cp\u003eRequired when using any Supertech valve retainers on any 90-05 Miata.\u003c\/p\u003e","brand":"Supertech","offers":[{"title":"Default Title","offer_id":67905886060743,"sku":"NM-1DD8BB","price":53.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/3659\/5143\/files\/supertech-1997-mazda-miata-1-6l-1-8l-6mm-valve-lock-req-2-pe-1_0db7f243-a4b6-4751-a176-679c3d494493.png?v=1791902557"},{"product_id":"supertech-valves-1990-2005-mazda-miata-na-nb-1-6l-1-8l","title":"Supertech Valves - 1990-2005 Mazda Miata (NA\/NB) 1.6L \/ 1.8L","description":"\u003cp\u003eSupertech intake and exhaust valves in black nitrided stainless or Inconel, standard or +1mm head, sold single or as a set of 8.\u003c\/p\u003e","brand":"Supertech","offers":[{"title":"1990-1993 (1.6L) \/ Intake - Black Nitrided \/ Standard - Single","offer_id":67909830246599,"sku":"NM-A92C3D","price":24.58,"currency_code":"USD","in_stock":false},{"title":"1990-1993 (1.6L) \/ Intake - 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thickness.\u003c\/p\u003e","brand":"Supertech","offers":[{"title":"1.00mm","offer_id":67909831524551,"sku":"NM-7BFFB0","price":8.28,"currency_code":"USD","in_stock":true},{"title":"1.05mm","offer_id":67909831557319,"sku":"NM-46B0C1","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.10mm","offer_id":67909831590087,"sku":"NM-9219AE","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.15mm","offer_id":67909831622855,"sku":"NM-0E2500","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.20mm","offer_id":67909831655623,"sku":"NM-4092A4","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.25mm","offer_id":67909831688391,"sku":"NM-B209E3","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.27mm","offer_id":67909831721159,"sku":"NM-547578","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.30mm","offer_id":67909831753927,"sku":"NM-B9C1F3","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.32mm","offer_id":67909831786695,"sku":"NM-BCDFC5","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.35mm","offer_id":67909831819463,"sku":"NM-207AA0","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.37mm","offer_id":67909831852231,"sku":"NM-A8D302","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.40mm","offer_id":67909831884999,"sku":"NM-FBEB2B","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.42mm","offer_id":67909831917767,"sku":"NM-446A87","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.45mm","offer_id":67909831950535,"sku":"NM-375A09","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.47mm","offer_id":67909831983303,"sku":"NM-1A1127","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.50mm","offer_id":67909832016071,"sku":"NM-F4263D","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.52mm","offer_id":67909832048839,"sku":"NM-F1E20E","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.55mm","offer_id":67909832081607,"sku":"NM-135CCB","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.60mm","offer_id":67909832114375,"sku":"NM-B8ADEB","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.65mm","offer_id":67909832147143,"sku":"NM-593E5C","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.70mm","offer_id":67909832179911,"sku":"NM-4BA10B","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.75mm","offer_id":67909832212679,"sku":"NM-697237","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.80mm","offer_id":67909832245447,"sku":"NM-922797","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.85mm","offer_id":67909832278215,"sku":"NM-CDFBE6","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.90mm","offer_id":67909832310983,"sku":"NM-1316B2","price":8.28,"currency_code":"USD","in_stock":false},{"title":"1.95mm","offer_id":67909832343751,"sku":"NM-9A19CD","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.00mm","offer_id":67909832376519,"sku":"NM-CEC4E5","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.05mm","offer_id":67909832409287,"sku":"NM-CBBD75","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.10mm","offer_id":67909832442055,"sku":"NM-8EC241","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.15mm","offer_id":67909832474823,"sku":"NM-7454E7","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.20mm","offer_id":67909832507591,"sku":"NM-E88977","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.25mm","offer_id":67909832540359,"sku":"NM-1CCD35","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.30mm","offer_id":67909832573127,"sku":"NM-A4BE49","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.35mm","offer_id":67909832605895,"sku":"NM-BB37B0","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.40mm","offer_id":67909832638663,"sku":"NM-92D849","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.45mm","offer_id":67909832671431,"sku":"NM-DC2FCA","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.50mm","offer_id":67909832704199,"sku":"NM-957823","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.55mm","offer_id":67909832736967,"sku":"NM-BCE575","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.60mm","offer_id":67909832769735,"sku":"NM-0D8A07","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.65mm","offer_id":67909832802503,"sku":"NM-4B218B","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.70mm","offer_id":67909832835271,"sku":"NM-730117","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.75mm","offer_id":67909832868039,"sku":"NM-C2EFC4","price":8.28,"currency_code":"USD","in_stock":false},{"title":"2.80mm","offer_id":67909832900807,"sku":"NM-EBF456","price":8.28,"currency_code":"USD","in_stock":false}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Valve locks are required for any NA6 or NA8 head using these valve spring kits. Choose \"Included\" to add 2 sets of 16 Supertech valve locks.\u003cbr\u003e\u003cbr\u003eSupertech's ratings:\u003cbr\u003e1990-1993 (1.6L) Single - 65 lb: 65 lb @ 33.6 mm seat, 158 lb @ 10.0 mm open, 9.60 lb\/mm\u003cbr\u003e1990-1993 (1.6L) Dual - 74 lb: 74 lb @ 35.0 mm seat, 195 lb @ 10.0 mm open, 12.10 lb\/mm\u003cbr\u003e1994-2005 (1.8L) Single - 63 lb: 63 lb @ 33.6 mm seat, 157 lb @ 10.0 mm open, 9.60 lb\/mm\u003cbr\u003e1994-2005 (1.8L) Dual - 75 lb: 75 lb @ 33.6 mm seat, 170 lb @ 10.0 mm open, 9.60 lb\/mm\u003cbr\u003e1994-2005 (1.8L) Dual - 85 lb: 85 lb @ 33.6 mm seat, 205 lb @ 10.0 mm open, 12.10 lb\/mm\u003c\/p\u003e","brand":"Supertech","offers":[{"title":"1990-1993 (1.6L) \/ Single - 65 lb \/ Not Included","offer_id":67909842272455,"sku":"NM-9D6012","price":564.83,"currency_code":"USD","in_stock":false},{"title":"1990-1993 (1.6L) \/ Single - 65 lb \/ Included (2 sets of 16)","offer_id":67909842305223,"sku":"NM-7FF7AE","price":670.91,"currency_code":"USD","in_stock":false},{"title":"1990-1993 (1.6L) \/ Dual - 74 lb \/ Not Included","offer_id":67909842337991,"sku":"NM-B793E2","price":630.57,"currency_code":"USD","in_stock":true},{"title":"1990-1993 (1.6L) \/ Dual - 74 lb \/ Included (2 sets of 16)","offer_id":67909842370759,"sku":"NM-82E792","price":736.65,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Single - 63 lb \/ Not Included","offer_id":67909842403527,"sku":"NM-5304F6","price":564.83,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Single - 63 lb \/ Included (2 sets of 16)","offer_id":67909842436295,"sku":"NM-3EF40B","price":670.91,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Dual - 75 lb \/ Not Included","offer_id":67909842469063,"sku":"NM-55CFD3","price":644.66,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Dual - 75 lb \/ Included (2 sets of 16)","offer_id":67909842501831,"sku":"NM-774E34","price":750.74,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Dual - 85 lb \/ Not Included","offer_id":67909842534599,"sku":"NM-0DF538","price":630.57,"currency_code":"USD","in_stock":true},{"title":"1994-2005 (1.8L) \/ Dual - 85 lb \/ Included (2 sets of 16)","offer_id":67909842567367,"sku":"NM-9EE355","price":736.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/3659\/5143\/files\/supertech-valve-spring-kit-1990-2005-mazda-miata-na-nb-1-6l--1.jpg?v=1791934250"}],"url":"https:\/\/www.nappmotorsports.com\/collections\/na-miata-valvetrain.oembed","provider":"Napp Motorsports","version":"1.0","type":"link"}