{"product_id":"exhaust-valve-193719","title":"Exhaust Valve for Defender (1986 – 2006) 3.5 - Cylinder Head - Exhaust – STC1122","description":"\u003cp\u003eThe STC1122 is an exhaust valve for the Rover 3.5 V8 petrol engine, fitted in the cylinder head to seal the combustion chamber during the intake and compression strokes and open to allow exhaust gases to exit. Exhaust valves operate under significantly higher temperatures than intake valves and are prone to burning, pitting, or recession over time, particularly on older 3.5 V8 units where valve seat wear is a known issue. Using a correct replacement valve ensures proper sealing, compression, and exhaust flow.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eExhaust valve designed specifically for the Rover 3.5 V8 cylinder head\u003c\/li\u003e\n\u003cli\u003eManufactured to OEM specification for correct stem diameter, head diameter, and overall length\u003c\/li\u003e\n\u003cli\u003eDirect replacement - no machining or modification required for standard fitment\u003c\/li\u003e\n\u003cli\u003eThe 3.5 V8 has two cylinder heads; check valve condition on both heads and replace valve stem seals and springs at the same time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eFits 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":55821802340696,"sku":"STC1122","price":5.48,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/0070\/6392\/files\/STC1122-600x600.jpg?v=1758871844","url":"https:\/\/thomasperformance.co.uk\/products\/exhaust-valve-193719","provider":"Thomas Performance Ltd","version":"1.0","type":"link"}