Mack61 Posted October 9, 2014 Share Posted October 9, 2014 Hi guys, I have a 66 B61 we are customising here in Australia and I am looking to re power it . I know you have gone through all this before but is there a general consensus on what is the best swap ?? We were thinking of throwing a turbo on and a kit through the 711 motor in it and winding that up, but the more I read on that I am getting a bit nervous about parts and even if we will get the hp we want. looking for 300-400 hp ?? if I had to go away from a Mack motor it would have to be a cat so any thoughts?? EMT-6 ?? 3408 ?? I don't want to stretch the front so I know that limits the options for big hp motors. Any help would be appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/ Share on other sites More sharing options...
Freightrain Posted October 9, 2014 Share Posted October 9, 2014 I think a 300 Mack is about the biggest I've seen without lots of work to make fit. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262659 Share on other sites More sharing options...
harrybarbon Posted October 9, 2014 Share Posted October 9, 2014 Have you spoken to Ian Lee at Tylden Heritage Kyneton Victoria, if not he is an excellent person to get real practical and sensible ideas for custom Mack trucks and engines check his web site at tylden hertigae Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262662 Share on other sites More sharing options...
e9500v8 Posted October 10, 2014 Share Posted October 10, 2014 If you crank that much out of a 711 you will score the cylinder walls. I wouldn't do it. If you want neat go E7 400 that would be cool ! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262728 Share on other sites More sharing options...
theakerstwo Posted October 10, 2014 Share Posted October 10, 2014 What Allen just said.The 711 is high compression and head gasket was a problem with them any way.Plus there is not many parts around for them. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262729 Share on other sites More sharing options...
Mack61 Posted October 10, 2014 Author Share Posted October 10, 2014 Ok cheers guys, i will look into the E7. Can anyone confirm it fits without mods to bonnet etc ? and would the old quad box handle it ?? It has big diffs but wanted to keep the 2 sticks for old time sake !! Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262733 Share on other sites More sharing options...
Superdog Posted October 10, 2014 Share Posted October 10, 2014 I'd go with a 300+ or an old tip turbine 350,with a E7 you gotta worry about a ATAAC in front of the radiator. Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-262735 Share on other sites More sharing options...
Mack61 Posted October 16, 2014 Author Share Posted October 16, 2014 Thanks for you r help guys.We have found a 50000 klm E6-285 out an army R600. ?? Whats your thoughts.Will the triplex box handle this power ?? And any thoughts on improving the clutch set up on the B models???? The old push clutch isn't ideal. Quote Link to comment https://www.bigmacktrucks.com/topic/37319-re-power-b61/#findComment-263450 Share on other sites More sharing options...
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