{"product_id":"gm-ls1-water-pump-thermostat-housing-bolt-kit-black-finish","title":"GM LS1 Water Pump \u0026 Thermostat Housing Bolt Kit - Black Finish","description":"\u003cdiv\u003e\n\u003ch2\u003eGM LS1 Water Pump \u0026amp; Thermostat Housing Bolt Kit - Black Finish\u003c\/h2\u003e\n\u003cp\u003eUpgrade your GM LS1 water pump and thermostat housing with a purpose-built bolt kit crafted from 8740-grade steel and finished in a durable black coating. Featuring 12-point head bolts for increased torque and a secure drive, this kit is designed to withstand engine vibrations while maintaining a clean, professional under-hood appearance.\u003c\/p\u003e \u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e2 Short Bolts — Under Head Length: 20mm; Head Diameter: 11.65mm; Thread: M6 x 1.00mm; Spanner Size: 8mm; 12-point head; Material: 8740-grade\u003c\/li\u003e \u003cli\u003e6 Long Bolts — Under Head Length: 80mm; Head Diameter: 15.20mm; Thread: M6 x 1.00mm; Spanner Size: 10mm; 12-point head; Material: 8740-grade\u003c\/li\u003e \u003cli\u003e2 Small Washers — Outside Diameter: 13.65mm; Inside Diameter: 6.50mm; Thickness: 2mm\u003c\/li\u003e \u003cli\u003e6 Large Washers — Outside Diameter: 16.85mm; Inside Diameter: 8.30mm; Thickness: 2mm\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey features and benefits\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eBlack finish adds corrosion resistance and a cohesive look with the engine bay styling.\u003c\/li\u003e \u003cli\u003e12-point head bolts provide improved torque transfer and a secure fit, reducing the risk of cam-out during installation or service.\u003c\/li\u003e \u003cli\u003e8740-grade steel delivers robust strength to handle thermal cycling and engine vibrations in LS1 applications.\u003c\/li\u003e \u003cli\u003ePrecisely sized under-head lengths and diameters ensure proper seating and clearance when mounting the water pump and thermostat housing.\u003c\/li\u003e \u003cli\u003eIncludes washers in two sizes to distribute load evenly and help maintain reliable sealing and fastener performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eCompatible with GM LS1 Water Pump and Thermostat Housing\u003c\/li\u003e \u003cli\u003eMaterial: 8740-grade steel\u003c\/li\u003e \u003cli\u003eFinish: Black\u003c\/li\u003e \u003cli\u003eHead type: 12-point\u003c\/li\u003e \u003cli\u003eShort bolts: Under Head Length 20mm; Head Diameter 11.65mm; Thread M6 x 1.00mm; Spanner 8mm\u003c\/li\u003e \u003cli\u003eLong bolts: Under Head Length 80mm; Head Diameter 15.20mm; Thread M6 x 1.00mm; Spanner 10mm\u003c\/li\u003e \u003cli\u003eWashers: 2 small (13.65mm OD, 6.50mm ID, 2mm thick); 6 large (16.85mm OD, 8.30mm ID, 2mm thick)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"TGM Performance Parts","offers":[{"title":"Default Title","offer_id":47484086780074,"sku":"AF37-1605","price":56.6,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/AF37-1605.jpg?v=1759296323","url":"https:\/\/tgmperformance.com.au\/products\/gm-ls1-water-pump-thermostat-housing-bolt-kit-black-finish","provider":"TGM Performance Parts","version":"1.0","type":"link"}