aragorn Posted January 8, 2015 Share Posted January 8, 2015 Hello,I am new to the forum-I hope I can get some clarification. I am looking for an R model Mack that will be used to haul equipment. I once had a one stack mack r model with a 250 hp 5 speed, I was grossing 66,000 lbs and it actually performed great. I want to get a tandemn Mack R model between the years 83-89 (I think the hood design changed in 1990?) but I am confused about the motor, dont know if I should get a 300 or 350. We still have an R model mack in our fleet- but I never have been around any other motors than the 250. Are the 300-350 motors as dependable and have the longevity of the 250. I am not interrested in a computerized motor-I want to stay old school Quote Link to comment https://www.bigmacktrucks.com/topic/38350-mack-engines/ Share on other sites More sharing options...
Popular Post theakerstwo Posted January 8, 2015 Popular Post Share Posted January 8, 2015 If you want to stay with a 5 or 6 speed then a 300 will be very usefull.Don't let guys tell you they want pull.You work them like they should and they do good.Alot of guys are use to cummins and cats that make big power at 2100 rpm and they cant find any reason to like the low rpm maxidyn engine that helped make this world.A 350 with a 12 speed or 9 speed is a good engine. 3 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/38350-mack-engines/#findComment-273617 Share on other sites More sharing options...
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