Reconditioned 1098 Engine Block 12G432 A-H Sprite MG Midget Big 2” Crank Mains !

Ann Arbor Sportscar is pleased to offer a reconditioned used BMC A-series 1098cc (1100) bare engine block for MG Midget and Austin Healey Sprite – as well as other British cars.This 1100 block casting number is 12G 432.This is a late-production BMC 1098 engine block for the “big crank” 2-inch diameter crankshaft mains – only produced for about two years from 1964 – 1966.The earlier standard 1098 engine variant had 1.75” crankshaft mains.   Please note that the flywheel bolt patterns are different, and some parts are interchangeable – and some parts are not.Replacement parts are readily available for both engine blocks.Please do your homework on this for your specific car model.The engine block is stamped number SCS.11.002 but this number is not original. This engine block comes with the correct matched set of three (3) original crankshaft main bearing caps numbered 8A7628. This engine block was recently serviced at our local reputable auto parts machine shop.The bare engine block was degreased and hot-tanked to clean it to the bare casting.The bare block was then magnafluxed for cracks and inspected for integrity and was found to be in good rebuildable core condition.We offer this as a reconditioned bare “builder” 1098 engine block.We measured a bore diameter of 2.588” for all four cylinders with our shop caliper – which we estimate is bored +.045” over standard bore.The buyer could either sleeve these cylinder bores to the desired diameter – or bore out to +.060 over. For SCCA racing purposes, the General Competition Rules reference indicates a maximum bore of +.0472 over for SCCA production category specs.All four cylinder bores are freshly honed and oiled and are smooth to the touch with no ridging at the top, and no deep scratches or divots in the bores.We did not instruct our machine shop to deck this engine block.   We measured a block depth of 21.8 cm from the oil pan rail to the deck.The machine shop primed this block to prevent it from flash rusting.

• Vintage Part: Yes
• Brand: Austin Healey