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Look into the 305/350ci V6 from60's- 70's GMC pick ups ( not Chevy they had straight 6) peek tq around 1800 redline 3500ish.
It was designed ad a diesel with a last minute change to gas with spark plugs squeezed into the glow plug holes and gas compression piston ( low / mid 7's IIRC) happy idle ~400rpm. SBC 400ci sized piston.
It was a farmers favorite as idling for 12-18hr daily for decades
Look into turbo charging specific to low rpm ( wastgate sized to handle mid - high rpm folw without overspeeding turbo. There is no replacement for displacement making torque and that is what a turbo dose artificial displacement . 14.7psi boost at sealed level doubles displacement.
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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