1. WRB426

    WRB426 Insane 4 Mopars FABO Gold Member

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    How much horsepower could I make with a 318 4BBL using the 1964 exhaust manifolds? I know the driver's side is pretty restrictive. I would use a roller hyd cam and pump gas friendly.
     
  2. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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    I would think you could shove 350HP through um.
     
  3. abodyjoe

    abodyjoe Well-Known Member

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    those 64 v8 manifolds really choke it down, ports are tiny, that drivers side with its 90* bend sucks...,.. guess it all depends on the build..
     
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    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      What I just love is, when people have those manifolds for sale and mark them as "HP manifolds" like they are some kinda holy grail. All those early ones are the same. LOL
       
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      • RustyRatRod

        RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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        To the OP, why not run the 340 manifolds? Either style, early or late will fit without power steering.
         
      • abodyjoe

        abodyjoe Well-Known Member

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        lol...
         
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        • WRB426

          WRB426 Insane 4 Mopars FABO Gold Member

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          Do the 340 manifolds fit the early A bodies? I didn't think they did. I have a set of 64 manifolds right now.
           
        • WRB426

          WRB426 Insane 4 Mopars FABO Gold Member

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          Yes I know I'm at a dealing with small ports. But not looking to set the world on fire. Just build a decent street motor. I'm a believer in not every street car needs 600 HP.
           
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          • abodyjoe

            abodyjoe Well-Known Member

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            thats all fine and dandy, and yes i understand that not all street cars need 600 hp. but your question is missing a ton of information.. so its a roller cammed 318 with a 4bbl.. is it all stock in which case the manifolods should be fine for daily type of street use. or is this a built motor? 400-500 hp??? if thats the case they will choke the hell out of it..
             
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            • Gib Warnick

              Gib Warnick '65 Valiant signet FABO Gold Member

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              The loss of horsepower is mostly at high rpm- for a mild build on street driver- may even help with low end torque
               
            • j par

              j par Well-hung Member

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              Pretty much all the information except for the 318 and the four barrel?
               
            • RustyRatRod

              RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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              With no power steering, yes. They are TIGHT. Tight enough that they may fit on one and another may have to shift the engine one way or the other, but they do fit.
               
            • WRB426

              WRB426 Insane 4 Mopars FABO Gold Member

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              I'm bench building a motor right now. Just trying to get ideas and pick people's brains that are smarter than me. Trying to advoid headers on an early A body. So any info is good info.
               
            • WRB426

              WRB426 Insane 4 Mopars FABO Gold Member

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              I might have to look into this further. Thanks.
               
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              • thesiren74

                thesiren74 Well-Known Member

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                They suck! We lost rpm and power everywhere.
                 
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                • RustyRatRod

                  RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                  Do a search....and keep searching. LOL There are people here who have done it and posted. The search function sucks hind tit, but if you keep playing with the wording, you will find it.
                   
                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

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                  The 340 manifolds have bigger ports but more important is the outlets are bigger.
                   
                • WRB426

                  WRB426 Insane 4 Mopars FABO Gold Member

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                  Thanks RRR. I'll search tonight when I get home.
                   
                • abodyjoe

                  abodyjoe Well-Known Member

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                  a friend had the 73 styler 340 manifolds on his 66 cuda.. like stated the engine had to shift around to get them in and out but they fit..
                   
                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

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                  • vitamindart

                    vitamindart Well-Known Member

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                    might want to look at the magnum manifold as well. with a little massaging they will fit an early A. had them in my 66 valiant before I swapped the slant back in.
                    they are a lot cheaper than the 340 manifolds.
                     
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                    • rumblefish360

                      rumblefish360 so close yet so far away

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                      I wouldn’t worry about how much power can be made but focus on everything else afterwards. On the engine build, I would yield at 9.0-1. A tad more is possible but the octane required may start to fall short if the cam isn’t big enough duration wise. This is an exercise of caution. Then select the cam. While the manufacturers list an rpm they operate in, it is a general one with the bigger engines in mind. So select the one down from the most performance oriented grind that works with your converter and gear ratio.

                      On the exhaust, duals with an H or X pipe will top it off just perfectly 2-1/2 max size pipe. And that is plenty large!

                      Which model is your transmission, rear end size, gear ratio and tire size?
                       
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                      • WRB426

                        WRB426 Insane 4 Mopars FABO Gold Member

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                        I'm planning on no P/S or power brakes. Haven't decided on transmission yet. I keep going back and forth on 4 speed/ 3 speed auto. 8 3/4 with 3:55 and either a 27" or 28" tall tire.
                         
                      • rumblefish360

                        rumblefish360 so close yet so far away

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                        IF this were I, I would use the 4spd trans. A 245/60/15 wheel & tire. (27 inch max tire diameter!) I'd skip the Hyd. roller cam myself. Umless you have a Magnum engine.
                        A cam duration @ .050 of 224 (-ish), 1.6 rockers, valve springs to match. (Call me crazy, but to expand the camshafts flexibility...) Top of the line Rhodes lifters, (Also available for the Chrysler Hyd. roller cam) adjustable duration units set at the max on the intake. Stock lifter on the exhaust.

                        OE or Edelbrock Performer intake. 650 cfm carb.
                         
                      • WRB426

                        WRB426 Insane 4 Mopars FABO Gold Member

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                        Yes I'm leaning towards the 4 speed. 255/60R15. I figured the roller cam can provide better cam profiles.
                         
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