{"product_id":"inlet-valve-193718","title":"Inlet Valve for Defender (1986 – 2006) Cyclinder Head - Inlet – STC1121","description":"\u003cp\u003eSTC1121 is an inlet valve for the Land Rover 3.5 V8 petrol engine cylinder head, controlling the intake of air-fuel mixture into each combustion chamber during the intake stroke. Inlet valves on the 3.5 V8 are subject to heat cycling and wear at the valve stem and seat, with worn or burnt valves causing loss of compression, rough idle, and reduced engine output. Correct replacement with a specification-matched valve is essential to maintain proper sealing and combustion efficiency.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eInlet valve designed specifically for the Land Rover 3.5 V8 petrol cylinder head\u003c\/li\u003e\n\u003cli\u003eDirect OEM-specification replacement ensuring correct stem diameter, head diameter, and valve length\u003c\/li\u003e\n\u003cli\u003eSuitable for use with standard valve guides and seats; inspect guides and seals for wear before fitting\u003c\/li\u003e\n\u003cli\u003eThe 3.5 V8 uses 16 valves in total - eight inlet valves are required for a full cylinder head rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eFits Land Rover Defender (1986–2006) 3.5 V8 Petrol, Discovery 1 (1989–1998) V8, Range Rover Classic V8, and Series 3 3.5 V8 Petrol.\u003c\/p\u003e\n\u003cp\u003eNot sure about fitment? Feel free to get in touch at \u003ca href=\"mailto:info@thomasperformance.co.uk\"\u003einfo@thomasperformance.co.uk\u003c\/a\u003e\u003c\/p\u003e","brand":"Allmakes 4x4","offers":[{"title":"Default Title","offer_id":55821802275160,"sku":"STC1121","price":3.76,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/0070\/6392\/files\/STC1121-600x600.jpg?v=1758871843","url":"https:\/\/thomasperformance.co.uk\/products\/inlet-valve-193718","provider":"Thomas Performance Ltd","version":"1.0","type":"link"}