Tips for HP gain?

Small Block Mopar Engine

  1. Hansen

    Hansen Well-Known Member

    Messages:
    76
    Likes Received:
    18
    Joined:
    Jan 27, 2020
    Location:
    Norway
    Local Time:
    1:41 PM
    Hi guys, i wanna get the most HP out of my engine, what do you think will help the most?
    I have not had it on the dyno but it does 9.5 on 1/8 mile with 75 mph over the line. (with bad traction).

    Engine: 1974 360 .30 over
    heads: ported 596 J-heads 1.60/1.88 valves
    Compression: 9.5:1
    Cam: Xe274-H flat tappet

    Duration @ 0.006": 274° / 286° Duration @ 0.050": 230° / 236°
    Max Lift w/ 1.5RR: .487" / .490" Lobe Separation: 110°

    Intake: LD340 edelbrock
    Headers: dougs D453 1-5/8 Inch
    Carb: 670 vaccum secondary holley.
    Cooling: stock waterpump, 1117 flex a lite 6 blade ''race'' fan.
    ignition: Stock electric ignition all around w/orange box.
    Fuel delivery: stock replacment mechanical.
    Timing: 35 at 3500 rpm.

    Unrelated to the engine hp:
    3:23 gears in a 8 3/4 sure grip, 727 manual shift, 3000 stall.

    Car is a 1969 dodge dart GT.

    Let me know if i forgot any info.
     
    Last edited: Sep 3, 2020
    • Like Like x 2
    • 318willrun

      318willrun Utube channel 318willrun

      Messages:
      15,536
      Likes Received:
      16676
      Joined:
      Sep 13, 2013
      Location:
      I'm here
      Local Time:
      7:41 AM
      Gears and converter??? What's it in???? What was the MPH in the 1/8 ???

      All the power does nothing if you can't put it to the ground. Fix the traction issue first. Then, are you talking major items like heads??? Or small changes??? For smaller items I'd swap the carb to a 750 double pumper. Make sure your tune/timing is correct.
       
      • Like Like x 2
      • Agree Agree x 2
      • dano

        dano Evil Handy Man

        Messages:
        3,335
        Likes Received:
        1206
        Joined:
        Aug 22, 2005
        Location:
        Gresham, Oregon
        Local Time:
        5:41 AM
        Did you degree the cam?
         
        • Agree Agree x 1
        • Hansen

          Hansen Well-Known Member

          Messages:
          76
          Likes Received:
          18
          Joined:
          Jan 27, 2020
          Location:
          Norway
          Local Time:
          1:41 PM
          3:23 gears and 3000 stall, 727 with manual shift, 74 mph in a 1969 dodge dart. really don't need to worry about the stuff around i got a plan on that already. Think like you were building the engine for a dyno test.
           
        • Hansen

          Hansen Well-Known Member

          Messages:
          76
          Likes Received:
          18
          Joined:
          Jan 27, 2020
          Location:
          Norway
          Local Time:
          1:41 PM
          Not sure what you mean on degreeing the cam? I have 35 at 3500.
           
        • Hansen

          Hansen Well-Known Member

          Messages:
          76
          Likes Received:
          18
          Joined:
          Jan 27, 2020
          Location:
          Norway
          Local Time:
          1:41 PM
          Has been thinking of heads but is there any major gain to justify 1600 bucks?
           
        • 318willrun

          318willrun Utube channel 318willrun

          Messages:
          15,536
          Likes Received:
          16676
          Joined:
          Sep 13, 2013
          Location:
          I'm here
          Local Time:
          7:41 AM
          well then, the 1/8 mile time in your first post was irrelevant as well.... LOL
           
        • 318willrun

          318willrun Utube channel 318willrun

          Messages:
          15,536
          Likes Received:
          16676
          Joined:
          Sep 13, 2013
          Location:
          I'm here
          Local Time:
          7:41 AM
          I gave 730 for a pair of Speedmaster heads fully loaded on black Friday sale. Don't know how your ported heads would stack up to them, depends on the porting job. Throw on a 750 DP and tune it. TUNE..... Speed is slow in the 1/8 even for bad traction.
           
          • Agree Agree x 1
          • Hansen

            Hansen Well-Known Member

            Messages:
            76
            Likes Received:
            18
            Joined:
            Jan 27, 2020
            Location:
            Norway
            Local Time:
            1:41 PM
            i thought instead of a dyno test to give you some idea on how much hp i have to start with. will delete it.
             
          • 318willrun

            318willrun Utube channel 318willrun

            Messages:
            15,536
            Likes Received:
            16676
            Joined:
            Sep 13, 2013
            Location:
            I'm here
            Local Time:
            7:41 AM
            no need to delete.... It is relevant, but to help understand the time you ran we needed to know what it's in (for weight) and gears, etc. 5800 lbs Maxi Van or a 2800 lbs early A, big difference. LOL. As I stated earlier, 74 mph is slow for that combo, unless you are doing a 450 ft one tire fire. What I'm saying is you are not getting the potential your combo has currently, so why throw parts at it? Tune it.
             
            • Agree Agree x 2
            • Like Like x 1
            • Slantsix64

              Slantsix64 Well-Known Member

              Messages:
              2,755
              Likes Received:
              1090
              Joined:
              May 11, 2014
              Location:
              SGV
              Local Time:
              7:41 AM
              275 60 nitto street slicks on 8 inch rim, 4.10 gears, trans go shift kit, and a 750 double pumper. Should help you out.
               
            • abdywgn

              abdywgn dismantler

              Messages:
              1,493
              Likes Received:
              740
              Joined:
              Jul 30, 2006
              Location:
              Darien, Illinois
              Local Time:
              7:41 AM
              windage tray? 360 would probably like 2.02" intake valves next time the heads are off. carb spacers if you have room. agree with bigger carb, ran a 750 vacuam secondary carb on a 340/4-speed/3.23 SG with 27" tires...good for 108 in the 1/4 (didn't use 4th gear). I did degree the cam, total timing was 36 at 3500, and the carb ran the black spring so the secondaries never fully opened.
               
            • dart_68

              dart_68 Well-Known Member

              Messages:
              655
              Likes Received:
              444
              Joined:
              May 25, 2017
              Location:
              Lakewood, CO
              Local Time:
              6:41 AM
              I have to respectfully disagree with the double pumper. Gears aren't nearly steep enough coupled to a 727. The CFM is ok but I think a vacuum secondary would be much better.
               
              • Agree Agree x 2
              • dano

                dano Evil Handy Man

                Messages:
                3,335
                Likes Received:
                1206
                Joined:
                Aug 22, 2005
                Location:
                Gresham, Oregon
                Local Time:
                5:41 AM
                That's your total timing and curve, which is important to know.

                A good read on the subject and I'm not being a snob about it as I used to not do it either until I saw the light.

                What is Meant by Degreeing the Camshaft, and Why is it Necessary?
                 
              • 33IMP

                33IMP Well-Known Member

                Messages:
                353
                Likes Received:
                347
                Joined:
                Jul 3, 2020
                Location:
                Taxifornia, soon 2b arizona
                Local Time:
                5:41 AM
                Best investment to go faster at the strip? An extra set of cheap wheels and a pair of decent used slicks.
                If you have traction problems now, what is the point of more power?
                 
                • Agree Agree x 2
                • Like Like x 1
                • RammerJammer75

                  RammerJammer75 Well-Known Member

                  Messages:
                  538
                  Likes Received:
                  679
                  Joined:
                  Aug 28, 2020
                  Location:
                  Kingsport, TN
                  Local Time:
                  8:41 AM
                  He's talking about putting a degree wheel on and verifying the cam advance/retard.
                   
                  • Agree Agree x 1
                  • 318willrun

                    318willrun Utube channel 318willrun

                    Messages:
                    15,536
                    Likes Received:
                    16676
                    Joined:
                    Sep 13, 2013
                    Location:
                    I'm here
                    Local Time:
                    7:41 AM
                    That's cool, but when my 360 was stock with stock exhaust manifolds, stock converter, and 2.45 gears it ran the best 1/4 mile time and best 60 ft time with the 750 dp. Other carbs that had a chance were a 600 eddy and 770 vacuum secondary. Proper tuning is key.
                     
                    • Agree Agree x 4
                    • Like Like x 2
                    • Hansen

                      Hansen Well-Known Member

                      Messages:
                      76
                      Likes Received:
                      18
                      Joined:
                      Jan 27, 2020
                      Location:
                      Norway
                      Local Time:
                      1:41 PM
                      why not? I rarely go to the strip, but when i do i don't won't the power saving to kill me.

                      As i mentioned before i have a plan on the traction problem (will be getting slicks and move in the leafs), only thing i want to know is if i want more power, what i should aim at?

                      thanks.
                       
                    • MiradaMegaCab

                      MiradaMegaCab Well-Known Member

                      Messages:
                      1,137
                      Likes Received:
                      727
                      Joined:
                      Feb 5, 2011
                      Location:
                      Long Island NY
                      Local Time:
                      7:41 AM
                      N2O
                       
                      • Thanks! Thanks! x 1
                      • Agree Agree x 1
                      • Hansen

                        Hansen Well-Known Member

                        Messages:
                        76
                        Likes Received:
                        18
                        Joined:
                        Jan 27, 2020
                        Location:
                        Norway
                        Local Time:
                        1:41 PM
                        I have choosen my carb based on this video, and calculated the cfm by his number.
                         
                      • 273

                        273 Well-Known Member

                        Messages:
                        3,395
                        Likes Received:
                        1128
                        Joined:
                        May 14, 2012
                        Location:
                        Ontario
                        Local Time:
                        8:41 AM
                        Heads are where the power is at everything else you do is to make most of what the heads have available.

                        Take your combo and swap different heads on and you'll come up with vastly different power levels and bands. Eg.. 318 heads vs 1.88 360 heads vs Edelbrocks vs trick flow each one is total change the powerband and power level.

                        You could go with bigger cam but your probable already getting 90+% of the power out of those J heads.
                         
                      • Hansen

                        Hansen Well-Known Member

                        Messages:
                        76
                        Likes Received:
                        18
                        Joined:
                        Jan 27, 2020
                        Location:
                        Norway
                        Local Time:
                        1:41 PM
                        thanks, thats what i'm worried about is if spending 1600 bucks on edelbrock heads and only get 30 some hp more. really don't want to change out the cam bc of the power brakes.
                         
                      • 273

                        273 Well-Known Member

                        Messages:
                        3,395
                        Likes Received:
                        1128
                        Joined:
                        May 14, 2012
                        Location:
                        Ontario
                        Local Time:
                        8:41 AM
                        Depends how well your heads are ported, if they flow as much as the Edelbrocks probably not much of a power difference then. Once you get past the basic cam, headers 4bbl each NA hp gets harder and more expensive to obtain. Trick Flows will definitely add power, Nitrous would be the cheapest.

                        I agree with the others get your traction problem fix 1st, more power will make it's worse. Then go from there.
                         
                        • Like Like x 1
                        • Hansen

                          Hansen Well-Known Member

                          Messages:
                          76
                          Likes Received:
                          18
                          Joined:
                          Jan 27, 2020
                          Location:
                          Norway
                          Local Time:
                          1:41 PM
                          Ofc the traction is my first priority, just curious on what you guys would recommend. if i change my heads this will probably raise my compression to 10.5, this should make pretty much hp though or is the flowing that matters?
                           
                        • 273

                          273 Well-Known Member

                          Messages:
                          3,395
                          Likes Received:
                          1128
                          Joined:
                          May 14, 2012
                          Location:
                          Ontario
                          Local Time:
                          8:41 AM
                          Cr matters but you'll gain like 5% so on 400 hp engine thats like 10-20hp so you had air flow gain with it would be good but cr alone not so much for the money.
                           
                        1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                          By continuing to use this site, you are consenting to our use of cookies.