360-383 A-debate...max builds need not apply.

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  1. diymirage

    diymirage HP@idle > hondaHP@redline

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    I figured I'd tow it to your place and let you have it as a hunting shed

    :poke:
     
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    • Jim Lusk

      Jim Lusk Well-Known Member

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      Some of you are missing something in reading the factory horsepower numbers. Around 1972 the way the power was rated changed from SAE Gross to SAE Net. That's why the 340 horsepower dropped, not because it was necessarily weaker engine and certainly not by the amount the number changed. Also remember that the '74 360 four barrel was rated at 5hp more than a '73 340. Build 'em the same and you will get similar results (like the '71 Chrysler 1/4 mile times listed above).
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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      I used a rollout of 84 inches so 26.7s, or something like 245/60-15s, or 295/50-15s
       
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      • pauly

        pauly MOPAR or no car! FABO Gold Member

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        Or not! My brother tore a mini-home apart once for the drivetrain. Said “Never again!” You looking for a big block? I have a few!!
         
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        • diymirage

          diymirage HP@idle > hondaHP@redline

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          thanks, but im really not...i dont have anything to put it in anyway

          but someone brought up the idea of picking an engine of craigslist and that was the closest thing i could find
           
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          • pauly

            pauly MOPAR or no car! FABO Gold Member

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            I've got a 383, a 400, and a 440 short block, along with a couple 340's and a 360
             
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            • diymirage

              diymirage HP@idle > hondaHP@redline

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              ill keep you in mind if i ever need one
               
            • Krooser

              Krooser Reform School Graduate

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              Big bore short stroke wins the race...
               
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              • sccachallenger

                sccachallenger Well-Known Member

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                Good call! 71-72 had non-dished pistons, and J heads.
                 
              • MOPARMAGA

                MOPARMAGA FABO Gold Member FABO Gold Member

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                Did you mean 383 is standard engine in challenger r/t ?
                 
              • DionR

                DionR Well-Known Member

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                I thought so, yes, but have since looked and was wrong.

                It was the ‘71 and ‘72 Road Runner that I was thinking of, not the Challenger/Barracuda. 383 was the base motor and the 340 was an extra cost option.
                 
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                • sccachallenger

                  sccachallenger Well-Known Member

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                  Always found it odd that the base engine(400) on a '72 Road Runner had blank call outs on the standard hood. Its almost like Chrysler was embarrassed by this, weird! Yet the 340 was proudly announced on standard hoods and air-grabber fenders.
                   
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                  • Dana

                    Dana FABO Vendor FABO Vendor

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                    Since
                    I had a 72 Charger Rallye 400 Magnum, 71,xxx miles bone stock EVERYTHING except a 3.91 gear. It had been rode hard and put away wet before I got it. When someone tells me that the 400 were slugs, I always tell them that they never rode in the one I had. It was one tire shredding S O B!
                     
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                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      The 71 only was all by itself. It had taller compression height pistons than any other year.
                       
                    • sccachallenger

                      sccachallenger Well-Known Member

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                      Interesting, I guess I assumed the pre-dished pistons were all the same.
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      They sure aren't. I found out live and in person about 1994 I guess. I had a 360 already to go in my 71 Dart. A friend who owned a salvage yard at that time knew I was a Mopar guy and called me to come get another one. That was a 71 engine. The later engine I already had was like .160 in the hole at TDC. The 71 was like .045 in the hole. That beeotch would set it on fire for what it was when I got done with it. lol
                       
                    • sccachallenger

                      sccachallenger Well-Known Member

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                      Wonder what out-of-the box piston is closest to those '71s?
                       
                    • lemondana

                      lemondana BlackDart

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                      That's because it probably had a Thermoquad on, Right?
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      None. You'd have to find one and get a custom copy.
                       
                    • Dartswinger70

                      Dartswinger70 Well-Known Member

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                      Me thinks talking about the 383 in the A body GTS vs any 340-360 would be the discussion. Me thinks the 383 was heavier and dint really perform any better in that particular a body. But I am not 100%., plus add in that the 383 didnt have power steering etc the trade off wasn't worth it. Speaking in terms of a street car.

                      the suspense was killing me so I did a quick google:

                      67 dart GTS 383 1/4 mile time 14.9 at 93 MPH.
                      68 dart GTS 340 1/4 Mile time 14.8 at 94 MPH.

                      Bot were 4 speed cars. I wanted to make sure I wasn't posting BS :)

                      Website is called Automobile-Catalog the Catalog of Cars, Car Specs Database
                       
                      Last edited: Feb 26, 2021
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                      • rumblefish360

                        rumblefish360 So close, yet so far away FABO Gold Member

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                        Taking into account the weight differences of each engine in the same car, the power differences are not huge and the gains will be small. The B engine will always win. Even with the weight penalty.
                         
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                        • pishta

                          pishta I know I'm right....

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                          That's exactly the point. Add headers (if you can fit them) to either and run the numbers. The 383 will pick up some without that crappy pinched manifold but you still have the weight penalty. That was base of discussion. Trying to get them both on same level minus obvious differences. Iron intakes and all.
                           
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                          • Dartswinger70

                            Dartswinger70 Well-Known Member

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                            I can agree purely in the terms of "racing" In a street car id probably go with the LA engine. You don't need power accessories cruising the 1/4 mile,and again in terms of A body. I had a B Body Coronet 500 back in the day with a 318. it was a nice car, and I would have liked it more with a 383 -440.

                            i do know big block people back in the day who wouldn't even play around with the LA engine. I had a friend who would call me and say "hey want this 360? come over here and get it out of my garage..." :)
                             
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                            • pishta

                              pishta I know I'm right....

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                              Running the numbers on that particular piston fit would be in the ballpark of a 1.642 compression height. Of course thats on a blueprints block with a deck height of 9.600. Speedpro SLP-H116s are close, shy of that at 1.660. Your deck height will vary.
                               
                            • 33IMP

                              33IMP Well-Known Member

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                              At least in 1970, the standard engine in a challenger r/t was a 383, the 340 was an extra cost option, but then if you bought the 340, it was not an r/t. Challenger aficianado's know it as an A66. I have a friend who has had her A66 for at least thirty years. We havent seen a real A66, other than hers, at the spring or fall flings in a decade.
                               
                              Last edited: Feb 27, 2021
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