diymirage
HP@idle > hondaHP@redline
1971 'Duster 340' ~ 4-Speed ~ 3.91 'Sure-Grip'
Magazine Performance Results
* 14.01 @ 100.14 MPG
take THAT prius :burnout:
1971 'Duster 340' ~ 4-Speed ~ 3.91 'Sure-Grip'
Magazine Performance Results
* 14.01 @ 100.14 MPG
My buddy's stock Boss 351 had no problem walking away from my Duster with it's mildly hot rodded 340 any time any place the last couple years.
Both of us fell short to my dad and his fuel-injected 327 Corvette.
I upped the ante this summer with a rebuild and a bunch more horsepower so hopefully I can take him next summer.
Paul
Specifications
1971 'Duster 340'......................................................................1971 Mustang 'Boss 351'
Shipping Weight.......... #3165 lbs............................................. #3281 lbs.
Curb Weight................ #3310 lbs............................................. #3430 lbs.
340__________________________________________-____351
Bore..........4.04"....................................................................... 4.00"
Stroke...... 3.31"....................................................................... 3.50"
275 HP 'Factory Rated'............................................................. 330 HP 'Factory Rated'
275 HP @ 5000 RPM's.............................................................. 330 HP @ 5400 RPM's
340 Ft/Lbs. of Torque @ 3200 RPM's....................................... 370 Ft/Lbs. of Torque @ 4000 RPM's
Tach Red Line............... 5500 RPM's....................................... 6150 RPM's
{ 310 HP 'NHRA' Rated }......................................................... { 330 HP 'NHRA' Rated }
1971 NHRA Class... G/S or SS/I............................................... F/S or SS/I
Compression........ 10.3 to 1..................................................... 11.3 to 1
Piston................... Flat-Top w/2 Notches................................ .315" Dome
Type..................... Forged Aluminum....................................... Forged Aluminum
Piston Height....... +.045 'Above Deck'..................................... -.008" 'Below Deck'
Crankshaft.......... Forged Steel................................................. Cast High-Strength Nodular
Rods................... Forged.......................................................... Forged ~ Shot-Peened and Magna-fluxed
Piston Pins......... Full-Floating.................................................. Pressed-Fit
Rod Bolts............ 3/8".............................................................. 3/8" ~ Special Length and Hardened
Cylinder Head...... #3418915 'J' Head...................................... D1ZE-B
CC Chamber......... 68.0 to 73.0 {Factory}................................ 67.6 {Factory}
CC Minimum........ 63.3 CC {NHRA}.......................................... 64.6 CC {NHRA}
Intake................. 2.02"............................................................ 2.19"
Exhaust............... 1.60"............................................................ 1.71"
Intake Port Size.. 1.16" x 2.27" ............................................... 2.50" x 1.75"
Exhaust Port Size 1.25" x 1.75"................................................ 2.00" x 1.74"
Intake Volume.... 157 CC.......................................................... 244 CC
Exhaust Volume.. 73 CC............................................................ 136 CC
Camshaft............ 'Hydraulic'..................................................... 'Mechanical'
Lift...................... .463"/.472" {NHRA specifications}.............. .502" / .502" {NHRA Specifications}
Duration.............. 276*/284*................................................... 290* / 290*
Overlap............... 52*............................................................... 58*
Valve Springs...... #134 lbs. 'Closed'......................................... #93 lbs. 'Closed'
Valve Springs.......#235 lbs. 'Open'........................................... #315 lbs. 'Open'
Rocker Arms........ Stamped-Steel Non-Adjustable.................... Stamped Steel 'High-Strength' Adjustable
Intake................. Cast Iron 360* Dual-Plane High-Rise........... Cast Aluminum Dual-Plane High Rise
Carburetor.......... Carter Thermo-Quad {800 CFM}.................... Autolite #4300-D {750 CFM}
Throttle Bore...... 1.375" Primary ~ 2.250" Secondary............... 1.563" Primary ~ 1.960" Secondary
Venturi............... 1.063" ~ Air-Valve.......................................... 1.250" ~ Air-Valve
Distributor......... Dual-Point....................................................... Dual-Point
Air Cleaner........ Unsilenced....................................................... Ram-Air Induction w/Twin 'NASA' Hood Ducts
Exhaust Pipe...... 2.25".............................................................. 2.50" Primary w/H-Pipe ~ 2.25" Secondary
Transmission..... 2.44 / 1.77 / 1.34 / 1.00 {A-833}.................. 2.32 / 1.69 / 1.29 / 1.00 {Close-Ratio}
Clutch................ 10.5".............................................................. 11.0"
Pressure-Plate.......................................................................... 3-Finger
Flywheel............ 27 lbs. ........................................................... 27.3 lbs.
Shifter............... Hurst Linkage.................................................. Hurst Shifter
Gears................ 3.91 'Sure-Grip' {Optional}.............................. 3.91 'Traction-Loc'
Rims................. 14" x 5.5"......................................................... 15" x 7"
Tires................. E-70 x 14" Goodyear Polyglas GT...................... F-60 x 15" Goodyear Polyglas GT
These boss 351 run around 55k now in nice restored original shape
I'm late here, but thanks for this thread Paul "69 Cuda 440."
I've posted before that I think the Boss 351 was the most powerful small block to come out of the American factories in the muscle car era.
Don't get me wrong, I love the SBM, but I have to give credit where it's due. In as delivered configuration, my opinion is it was the best of the bunch.....including the 70' LT1, and I have driven both.
So were the darts after 70 made in canada,I had a 71 340 twin scoop auto red with blk vinyl top column shift 3.55 sg 8 3/4,rallye wheels,that had ps pb with 43k was one of the nicest cars I ever owned,was like new and I regret the day I sold it..bone stock and unmolested and I left it that way still ran low to mid 14's if I recall correctly..No, the last 340 Dart in the United States was in 1970 with the 'Swinger'.
They were a little heavier than the 1971 'Duster 340'.
Shipping Weight
* 1971 Duster 340 - 4-Speed...................... #3165 lbs.
* 1970 Dart 'Swinger 340' - 4-Speed............ #3179 lbs.
So were the darts after 70 made in canada,I had a 71 340 twin scoop auto red with blk vinyl top column shift 3.55 sg 8 3/4,rallye wheels,that had ps pb with 43k was one of the nicest cars I ever owned,was like new and I regret the day I sold it..bone stock and unmolested and I left it that way still ran low to mid 14's if I recall correctly..