francor94 Posted March 12, 2022 Share Posted March 12, 2022 Hello my name is franco rotunno I’m writing from venezuela in South America. Mack is by far the most popular truck brand here and half of the trucks you see at highway are Mack, olds r600 doing their job just right. Also the Mack engines are the most popular engines and parts to swap as I’ll show a big tractor I get from my grand pa a Cameco 405ag which he swapped a 675 Mack engine. It was my time to rebuild so I put a big turbo looks like hx50 5” intake exhaust. But I want to know or ask what are the difference between 675 and 676 engine what part can I swap between those engines to get more power and if a tip turbo helps me because a front Inter cooler is almost imposible. I’m looking to 350 hp. Because a tractor use a constant 2100 rpm all they long. Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/ Share on other sites More sharing options...
fjh Posted March 12, 2022 Share Posted March 12, 2022 (edited) sweet install 237 ?the 285 350 type stuff will bolt on there for sure log as you got a doner vehicle! you run the risk of breaking the block if you try to take more than 350 out of it! In my mind your better off with a 285 maxidine set up for a tractor just me! the governor set up is more freindly for that kind of work! note to that when the hp increased on this block they added stifening webs between the main caps! Edited March 12, 2022 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/#findComment-491871 Share on other sites More sharing options...
francor94 Posted March 12, 2022 Author Share Posted March 12, 2022 I have 4 more engines but I have to check out wich model is each, what are the main differences between 673, 675 and 676? What’s the power rate of each? Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/#findComment-491875 Share on other sites More sharing options...
fjh Posted March 12, 2022 Share Posted March 12, 2022 I beleive there are minor changes to each progressivly fueling turbo ect Not a guru on this subject! an example A v8 865 was a 325 maxidine 866 went to 375 with out the maxidyne function ! I think the engine you have there is a 237 if it had a 6 sp trans behind it it would have been a Maxidyne and with out it would have been a 235! again not a GURU! Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/#findComment-491876 Share on other sites More sharing options...
Bliue dm Posted March 12, 2022 Share Posted March 12, 2022 673 was a 237 ,250 turbo. I've seen guys take them to 300 but not much more than that. 675 I believe is a 300. I know you can take 675 pistons and put them in a 673. 676 I believe is the tip turbine and I'm not sure what changed internally. I do know the 676 comes as a 350hp as well as what they call a 285/315. Hopefully someone else will chime in who knows a little more. Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/#findComment-491905 Share on other sites More sharing options...
Popular Post JoeH Posted March 13, 2022 Popular Post Share Posted March 13, 2022 ENDT675 is a D for Diesel, T for Turbo, 675 is a 237hp. ENDT676 is similar, but is 283hp and has the Tip Turbine intake air cooler setup. Turbos are different, fueling is different, minor changes to block reinforcements, cylinder head bolts might be different. ENDTB (B means it has dynatard engine brake) is another possible part of the sequence. They are all 672 cubic inch engines, but they upped the last digit as they generated new hp variants. 1 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69373-my-tractor-with-mack-heart/#findComment-491972 Share on other sites More sharing options...
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