mackglobal Posted September 12, 2015 Share Posted September 12, 2015 (edited) I have a Mack truck R686 with E6-350HP sticker on the engine block. It is a 2V system. I expect the engine to be 4v but it is 2v system. Is it possible to change 4V cylinder head to 2V cylinder head. What are the effects on the engine. Edited September 13, 2015 by mackglobal Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/ Share on other sites More sharing options...
Timmyb Posted September 12, 2015 Share Posted September 12, 2015 I think the 350 came in both 2v and 4v. Best way to tell the difference is the valve covers. 2v have pressed steel ones, 4v has cast alloy ones. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303465 Share on other sites More sharing options...
mackglobal Posted September 12, 2015 Author Share Posted September 12, 2015 I felt both the cylinder head and the valve cover were all changed. Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303473 Share on other sites More sharing options...
Superdog Posted September 12, 2015 Share Posted September 12, 2015 I've got a 4V E6-350 with 2V heads and tip turbine with side mounted intercooler,instead of the ATAAC in front of the radiator.It's in a '82 Cruiseliner,set up by previous owner,it runs ok,pulls hard,but it don't start worth a damn ,most cold blooded engine of any kind I've ever seen. Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303478 Share on other sites More sharing options...
Timmyb Posted September 12, 2015 Share Posted September 12, 2015 From what I've read, a 350 2v makes its peak hp at 1950rpm, which is what your tag says. But I'm very sure a 4v 350 makes its peak hp at 1850rpm. Some might confirm this, but looks like you have a 2v. Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303483 Share on other sites More sharing options...
mackglobal Posted September 12, 2015 Author Share Posted September 12, 2015 It has front mounted inter cooler like the 4vs. Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303509 Share on other sites More sharing options...
220cummins Posted September 12, 2015 Share Posted September 12, 2015 350 2v had chassis mount coolers. Parted out an 83 r model with that setup. Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303511 Share on other sites More sharing options...
Timmyb Posted September 12, 2015 Share Posted September 12, 2015 My '84 has air to air in front of the radiator also. And the way my 2v drives, I wouldn't swap in for a 4v! Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303534 Share on other sites More sharing options...
mackglobal Posted September 13, 2015 Author Share Posted September 13, 2015 (edited) Superdog, make sure you always keep hot water near you incase the engine goes cold. lol Edited September 13, 2015 by mackglobal Quote Link to comment https://www.bigmacktrucks.com/topic/41755-effects-of-changing-4v-to-2v/#findComment-303564 Share on other sites More sharing options...
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