mackdaddy Posted May 22, 2009 Share Posted May 22, 2009 what year did th e4 valve head make it's debut? did they overlap for any reasons? Quote Link to comment https://www.bigmacktrucks.com/topic/9470-year-4-valve-head-started/ Share on other sites More sharing options...
HK Trucking Posted May 22, 2009 Share Posted May 22, 2009 If you're referring to the E6 4 valve,1987 or 88 was the first time I saw them out there. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/9470-year-4-valve-head-started/#findComment-35535 Share on other sites More sharing options...
Rob Posted May 22, 2009 Share Posted May 22, 2009 If you're referring to the E6 4 valve,1987 or 88 was the first time I saw them out there.The first one I seen was in October of 1985 at Tidewater Mack and it was brand new. I used to "hang" there cause they did a lot of support for the B modes at the time.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/9470-year-4-valve-head-started/#findComment-35543 Share on other sites More sharing options...
Mackpro Posted May 22, 2009 Share Posted May 22, 2009 what year did th e4 valve head make it's debut? did they overlap for any reasons? My 1984 Mack tune up book does list the 4VH but the 1983 tune up book does not. My 1989 book does still list the E6 2 valve motor but I'm missing my 1990 book and the 1991 book makes no metion of the E6 2V. I have most of the Mack tune up books from 1972 and up and there handy. Quote Link to comment https://www.bigmacktrucks.com/topic/9470-year-4-valve-head-started/#findComment-35545 Share on other sites More sharing options...
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