AMGeneral Posted October 8, 2020 Share Posted October 8, 2020 Hi all, I am looking at a 1971 DM685 that I am considering buying, seller states it has a Mack quadbox and a 673 engine, was the 673 offered in that late of a year model or is it a swap that has been done? Quote Link to comment https://www.bigmacktrucks.com/topic/64505-endt-673-final-year-offered/ Share on other sites More sharing options...
0 davehummell Posted October 8, 2020 Share Posted October 8, 2020 I have a etz673 engine that came out of a 1980 mack fire truck. I thought they were using 675 from 66 or 67 on I know the fleet I took care of were early f's and r's all had 675 engines. Quote Link to comment https://www.bigmacktrucks.com/topic/64505-endt-673-final-year-offered/#findComment-462083 Share on other sites More sharing options...
0 doubleclutchinweasel Posted October 13, 2020 Share Posted October 13, 2020 (edited) ENDT-673 was absolutely offered that late. ENDT-675 was introduced in mid-60s as an option. If it has a factory Quad box, it SHOULD NOT have the 675...not from the factory at least. 250HP ENDT-673 with the Quad was a common configuration. Oh, on my '70 R600, it was stamped "T-673C" on the RH side of the engine, on the gear case. That made it the ENDT-673C engine. It was marked 250 HP on the tag on the valve cover. Also, this engine was standard on that particular model number: R611. The R611 was a Thermodyne powered model. The ENDT-675 mentioned above (237 HP Maxidyne) would have come in the R685. So, check the serial number stamped on the RH side of the frame, near the rear hanger for the front spring. The one on the door may be right, or the door may have been changed. Lots of good info on here about what the various model numbers told you about the truck. Hope it works out for you. Edited October 13, 2020 by doubleclutchinweasel Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64505-endt-673-final-year-offered/#findComment-462332 Share on other sites More sharing options...
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AMGeneral
Hi all,
I am looking at a 1971 DM685 that I am considering buying, seller states it has a Mack quadbox and a 673 engine, was the 673 offered in that late of a year model or is it a swap that has been done?
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https://www.bigmacktrucks.com/topic/64505-endt-673-final-year-offered/Share on other sites
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