A: For V8 motors, the 6V71 is the blower to run. The inline 6 one is WAAAY too long! I sold the last 3 I had (ex-city buses I bought for $500 each for scrap. ) for $500 each, got $1,000 each for the motors for core and $3,000 in scrap aluminum (price was up at the time) but the one I put all that money into to make a motorhome out of only went for $1200. The rigs with turbo kept the blower till they went 4 stroke in '95 or so. From: adh@xxxxxxxxxxxxxxxxx (Sandwich Maker) To: mail@xxxxxxxxxxxx Subject: Re: R&D AMC six head numbers " From: farna@xxxxxxx " " Funny!! LOL " " The only time I saw 6-71 though, was referring to a Rootes type " blower. 6-71 means it was designed for a six cylinder engine and has " a 71 cuibic inch displacement (the blower, not the engine!). nope, that would be referring to the engine it was designed for. once upon a time the 6-71 was a popular engine for gmc trucks. '6-71' means six cylinders [in line], 71 cubes per cylinder. note there was also a 6v-71. dd had several series like that; 53, 71, 92, 110, 149... 2 to 12 [at least] cylinders, inlines and vees. all had rootes blowers to scavenge the cylinders as they didn't use crankcase induction like spark two-strokes. some also had turbos; i don't know if any of those dropped the blowers. they're not well loved by truckers; they tend to have rather peaky torque curves, necessitating lots of shifting in any kind of non-flat terrain. they're also very heavy [by modern standards at least] for their output. the 3-53 once offered in 1-ton vans weighed over 1000 lbs and had 108hp@2800rpm. a modern diesel like the mercedes om613 has twice the hp and half the weight - and it's a 4-stroke. " On July 15, 2005 andrew hay wrote: " " > obviously, if it says 6-71 it must be a reworked detroit diesel " > head... " > ________________________________________________________________________ btw the pic looks like 6-11 to me. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought