{"product_id":"valve-exhaust-183747","title":"Valve - Exhaust for Discovery 3 (2005 – 2009) Exhaust – 4646004","description":"\u003cp\u003eThis is a genuine replacement exhaust valve for the 4.4 AJ-V8 and 4.2 supercharged V8 petrol engines fitted to Discovery 3, Range Rover, and Range Rover Sport models. The exhaust valve controls the expulsion of combustion gases from the cylinder, seating against the valve seat to maintain compression and combustion efficiency. Worn or burnt exhaust valves typically present as loss of compression, rough idle, misfires, or increased exhaust emissions on these high-output V8 engines.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eExhaust valve manufactured to OEM specification for the AJ 4.4 V8 and 4.2 supercharged V8 petrol engines\u003c\/li\u003e\n\u003cli\u003eDesigned to withstand the elevated temperatures and pressures of the exhaust stroke in high-displacement V8 applications\u003c\/li\u003e\n\u003cli\u003eDirect replacement part - no modification required for fitment\u003c\/li\u003e\n\u003cli\u003eV8 engines use multiple valves per cylinder; confirm total valve count required before ordering, and inspect valve seats and guides simultaneously during replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eFits Discovery 3 (2005–2009) 4.4 AJ Petrol V8, Range Rover (2002–2009) 4.2 V8 Supercharged and 4.4 AJ Petrol V8, and Range Rover Sport (2005–2009) 4.2 V8 Supercharged and 4.4 AJ Petrol V8.\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":55820391973208,"sku":"4646004","price":10.78,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/0070\/6392\/files\/4646004-600x600.jpg?v=1758862752","url":"https:\/\/thomasperformance.co.uk\/products\/valve-exhaust-183747","provider":"Thomas Performance Ltd","version":"1.0","type":"link"}