<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hello Alan, the answer is simple but complicated…. It will to some degree mean what version Atlantic engine, early or late. Like most manufacturers there were changes along the way. Baically the Atlantic and Healey are big bore Austin A70 engines. The block casting and pistons the main difference. Things like crank and conrods are the same for all 3 and have the same Austin part numbers. Same flywheel and clutch except for the A70 which is only the same in the utilities. Cams are the same except early A70 engines had narrower lobes than the later ones, which are the same as Atlantic and Healey. Some Atlantics and most A70’s had the centrifugal gear oil pump with almost the same gears as the 3000 pump, and the spring loaded pushrods. As far as I know in some form this engine continued to be produced in some form up until the early 1970’s in petrol, diesel, marine and industrial form. There was even a 2.5 litre petrol version that had a proper rear main seal. So I’m told.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Larry Varley<o:p></o:p></span></p></div></body></html>