Jeffrey s Posted September 29, 2013 Share Posted September 29, 2013 I have a B61 with a sick 673 and a 5and3 tranny. I have found a 237 Mack engine will it fit my truck. if not what engine would be a good upgrade for my truck any info would be greatly appreciated .Thanks Jeff Quote Link to comment https://www.bigmacktrucks.com/topic/32963-engine-upgrade/ Share on other sites More sharing options...
Maddog13407 Posted September 29, 2013 Share Posted September 29, 2013 perfect upgrade. should about bolt right in. may have to have the bell housing of the tranny drilled to 7/16's from 3/8's bolts if its olf style and change the front crank hub and pulleys to the one from your old engine. other than that it will bolt right in. Quote Link to comment https://www.bigmacktrucks.com/topic/32963-engine-upgrade/#findComment-209046 Share on other sites More sharing options...
Jeffrey s Posted September 30, 2013 Author Share Posted September 30, 2013 Thanks a lot for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/32963-engine-upgrade/#findComment-209119 Share on other sites More sharing options...
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