Truck Shop Posted August 14, 2019 Share Posted August 14, 2019 Can anyone tell me the standard number of core rows and tube dimensions for a 73 or 75 radiator core. I'm installing a five row 1/2" tube core. Thanks for any reply's Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/58607-b73-or-75-radiator/ Share on other sites More sharing options...
j hancock Posted August 14, 2019 Share Posted August 14, 2019 Have two here but I am not 100% sure if they are OEM. One is out of Cummins truck (B73) with a core thickness of 2.75", 4 rows of 1/2" tubes in a staggered pattern with 10 fins per inch. The one out of the B75 is 2.375" thick with the remaining specs same as above. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/58607-b73-or-75-radiator/#findComment-430060 Share on other sites More sharing options...
Truck Shop Posted August 14, 2019 Author Share Posted August 14, 2019 Thanks for the reply, the one that was in it was 3/4 tube 4 row 3.00 thick. But in talking to the builder in B.C. those 3/4 tube radiators flowed to fast. and the coolant would not cool down enough exiting the bottom tank. Years ago they built 1/2" tube five row for Cummins powered loggers. Thanks again. Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/58607-b73-or-75-radiator/#findComment-430096 Share on other sites More sharing options...
j hancock Posted August 15, 2019 Share Posted August 15, 2019 Yup, too fast is no good for heat transfer. Sounds like you will be all set. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/58607-b73-or-75-radiator/#findComment-430113 Share on other sites More sharing options...
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