{"title":"Head Gaskets","description":"","products":[{"product_id":"absolute-cnc-products-copper-cylinder-head-gasket-o-s-engines","title":"Absolute CNC Products – Copper Cylinder Head Gasket (O.S Engines)","description":"\u003ch2 data-section-id=\"8gdbvt\" data-start=\"0\" data-end=\"56\"\u003eAbsolute CNC Products – Copper Cylinder Head Gasket\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1efr422\" data-start=\"57\" data-end=\"83\"\u003eO.S. 105HZ \/ 105HZ-R\u003c\/h3\u003e\n\u003ch3 data-section-id=\"w0yv92\" data-start=\"84\" data-end=\"118\"\u003e0.012\" (0.3mm) Annealed Copper\u003c\/h3\u003e\n\u003cp data-start=\"120\" data-end=\"470\"\u003eThe Absolute CNC Products Copper Cylinder Head Gasket is designed specifically for the O.S. 105HZ and 105HZ-R nitro helicopter engines. Precision cut from high-quality annealed copper, this gasket provides excellent sealing performance while offering a simple and effective method for reducing compression ratio when running higher nitro fuel blends.\u003c\/p\u003e\n\u003cp data-start=\"472\" data-end=\"650\"\u003eCommonly used with 23% and 30% nitromethane fuel, the 0.3mm thickness helps improve tuning stability and reduce the likelihood of pre-detonation in high-performance applications.\u003c\/p\u003e\n\u003cp data-start=\"652\" data-end=\"819\"\u003eUnlike stacked OEM shims, this single-piece copper gasket offers a durable, uniform sealing surface with excellent heat transfer characteristics and long service life.\u003c\/p\u003e\n\u003ch3 data-section-id=\"19zqy0x\" data-start=\"821\" data-end=\"833\"\u003eFeatures\u003c\/h3\u003e\n\u003cul data-start=\"834\" data-end=\"1147\"\u003e\n\u003cli data-section-id=\"1f247y7\" data-start=\"834\" data-end=\"880\"\u003ePrecision-cut annealed copper construction\u003c\/li\u003e\n\u003cli data-section-id=\"1tlthm5\" data-start=\"881\" data-end=\"948\"\u003eHelps reduce compression ratio for high nitro fuel applications\u003c\/li\u003e\n\u003cli data-section-id=\"a6my06\" data-start=\"949\" data-end=\"1001\"\u003eExcellent heat resistance and sealing properties\u003c\/li\u003e\n\u003cli data-section-id=\"md8yu6\" data-start=\"1002\" data-end=\"1033\"\u003eDurable single-piece design\u003c\/li\u003e\n\u003cli data-section-id=\"1oergkc\" data-start=\"1034\" data-end=\"1085\"\u003eConsistent thickness for reliable engine tuning\u003c\/li\u003e\n\u003cli data-section-id=\"1mer3q8\" data-start=\"1086\" data-end=\"1147\"\u003eIdeal for aggressive 3D and high-performance nitro flying\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1yl5694\" data-start=\"1149\" data-end=\"1167\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul data-start=\"1168\" data-end=\"1271\"\u003e\n\u003cli data-section-id=\"1nclppm\" data-start=\"1168\" data-end=\"1197\"\u003eMaterial: Annealed Copper\u003c\/li\u003e\n\u003cli data-section-id=\"12kwuxz\" data-start=\"1198\" data-end=\"1227\"\u003eThickness: 0.012\" (0.3mm)\u003c\/li\u003e\n\u003cli data-section-id=\"s6vdn3\" data-start=\"1228\" data-end=\"1271\"\u003eCompatibility: O.S. 105HZ, O.S. 105HZ-R\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"mwlqn9\" data-start=\"1273\" data-end=\"1295\"\u003eTuning Information\u003c\/h3\u003e\n\u003cp data-start=\"1296\" data-end=\"1349\"\u003eThe 0.3mm cylinder head gasket is commonly used with:\u003c\/p\u003e\n\u003cul data-start=\"1350\" data-end=\"1387\"\u003e\n\u003cli data-section-id=\"huyc8\" data-start=\"1350\" data-end=\"1368\"\u003e23% nitro fuel\u003c\/li\u003e\n\u003cli data-section-id=\"1urthoa\" data-start=\"1369\" data-end=\"1387\"\u003e30% nitro fuel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1389\" data-end=\"1412\"\u003eRecommended glow plugs:\u003c\/p\u003e\n\u003cul data-start=\"1413\" data-end=\"1436\"\u003e\n\u003cli data-section-id=\"1v7nxrj\" data-start=\"1413\" data-end=\"1424\"\u003eO.S. #8\u003c\/li\u003e\n\u003cli data-section-id=\"m3jn4c\" data-start=\"1425\" data-end=\"1436\"\u003eENYA #4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1438\" data-end=\"1468\"\u003eIf pre-detonation occurs, try:\u003c\/p\u003e\n\u003cul data-start=\"1469\" data-end=\"1493\"\u003e\n\u003cli data-section-id=\"g2872u\" data-start=\"1469\" data-end=\"1481\"\u003eO.S. #10\u003c\/li\u003e\n\u003cli data-section-id=\"m3jmbx\" data-start=\"1482\" data-end=\"1493\"\u003eENYA #5\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1495\" data-end=\"1576\"\u003eThis gasket thickness is approximately equivalent to stacking two OEM head shims:\u003c\/p\u003e\n\u003cul data-start=\"1577\" data-end=\"1618\"\u003e\n\u003cli data-section-id=\"11q0tr\" data-start=\"1577\" data-end=\"1597\"\u003e0.1mm OEM gasket\u003c\/li\u003e\n\u003cli data-section-id=\"nf1xzg\" data-start=\"1598\" data-end=\"1618\"\u003e0.2mm OEM gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1620\" data-end=\"1729\"\u003eThis combination is frequently recommended to help reduce compression ratio when operating on 30% nitro fuel.\u003c\/p\u003e\n\u003ch3 data-section-id=\"5031p5\" data-start=\"1731\" data-end=\"1753\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp data-start=\"1754\" data-end=\"1939\"\u003eEnsure all gasket and mating surfaces are clean before installation. Because annealed copper is soft and highly conformable, handle the gasket carefully to avoid bending or deformation.\u003c\/p\u003e\n\u003cp data-start=\"1941\" data-end=\"2115\"\u003eAlways avoid running excessively lean fuel mixtures, as lean conditions can cause severe engine damage. Follow the manufacturer’s baseline needle settings before fine tuning.\u003c\/p\u003e\n\u003cp data-start=\"2117\" data-end=\"2251\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eProudly offered by Absolute CNC Products for pilots who demand reliability, precision, and performance from their nitro engine setups.\u003c\/p\u003e","brand":"Absolute CNC Products","offers":[{"title":"Default Title","offer_id":47310718533809,"sku":null,"price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0599\/9630\/7633\/files\/A4CAFA57-3F2C-41CF-8466-2ADC84838EE9.png?v=1779490082"}],"url":"https:\/\/absolutecncproducts.com\/collections\/head-gaskets.oembed","provider":"Absolute CNC Products ","version":"1.0","type":"link"}