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you don't want to run the 4bt over 3200 rpm sustained; much more vibration in the 4bt than 6bt. i would just go w/ the 3200 gov springs; it'll get you the rpm to get to the next gear and will save you from buying HD valve springs. you'll meet your hp goals with a 4bt. heck, in marine trim...

you said 'VE' engine, so that's why i asked for clarification. and you've made it abundantly clear that we have no ability to disagree, let alone argue, with you due to your knowledge and experience. good luck with your project.

so you're saying your 1st gen 6bt is rated at 150hp @ 2200 and 470ft-lb at 1300 rpm? what CPL is it?

then what are you asking?

wow. i guess there's nothing left to say. good luck. take lots of pictures.

hmm, i seem to be missing a reply... anyway, i replied to challenge two things: the 47rh, while 'marginal' in stock form, is the transmission that is built up the most often behind high hp competition diesels (including some hi-HP D-maxes). it can be built to hold any power rating that a...

the shortest [advisable] trans you can get will be an NV4500 5 spd with the GM 6" fixed yoke tailhousing. you can start with a GM or Dodge nv4500, but you'll need to swap out the input shaft to a Dodge input if you use a GM trans. if the 6bt is not aftercooled, this will simplify things...

not sure where you read "400ft-lbs" at? everything i've seen on here is ~330ft-lbs, and that's been pure speculation. regardless, i concur with you that it is the weak link due to several different design issues and has shown only marginal reliability behind stock-fueled MF's (135-ish hp /...