12 valve or 7.3
#15
#16
#18
From what lil I know it is easier to turn up a 12V but a 7.3 is just a reliable towin machine. a 7.3 would be more versatile because you could use a chip to turn it up for pullin at the track and then change it to a tow mode for pullin a trailer. but the 12V would be easier to build to be any type of competitive for truck pulls
#19
#20