{"product_id":"mcs946148","title":"Hastings 2.745\" Bore Piston Ring Set. +.040\" – 1929–1949 45\" (750cc) Flathead","description":"\u003ch2\u003eHastings 2.745\" Bore Piston Ring Set. +.040\" – 1929–1949 45\" (750cc) Flathead\u003c\/h2\u003e\n\u003cp\u003eComes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745\" (69.72mm). 1st ring: 2.3mm (3\/32). 2nd ring: 2.3mm (3\/32''). Oil ring: 3.2mm (1\/8\"). Note: OEM 1950-1973 pistons are equipped with 1\/16\" (1.6mm) 1st. \u0026amp; 2nd rings and late style 3\/16\" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010\" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e29-49 45\" (750cc) Flathead (NU)\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hastings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; PISTON RINGS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e PR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 946148\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Numbers\u003c\/h2\u003e\n\u003cp\u003eMCS Part Number: 946148\u003cbr\u003eManufacturer Part Number: 11-2533\u003c\/p\u003e","brand":"Hastings","offers":[{"title":"Default Title","offer_id":57378713567619,"sku":"MCS946148","price":112.07,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/908440k.jpg?v=1785973336","url":"https:\/\/hogparts.co.uk\/products\/mcs946148","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}