Free cam build...

Small Block Mopar Engine

  1. 67autocross

    67autocross A new iron curtain drawn across the 49th parallel

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    I was at my friends shop and he give me a new cam... should I use it and what would be a good combo to build with it...

    4B8F9EF6-6E3B-491D-AAD0-B02052220E10.jpeg
     
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    • RustyRatRod

      RustyRatRod Weenie idiot loser. FABO Gold Member

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      You're gonna need a LOT of motor for that. A WHOLE lot.
       
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      • SSG_Karg

        SSG_Karg Stuck in the middle

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        11:1 340
        Holley 750DP, Strip Dominator, Speedmaster heads, headers, 3500 converter or 4 spd, 3.91 rear, 26” tire. Run 93 octane and sneek up on the timing.
        Let it eat.
         
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        • 70aarcuda

          70aarcuda Master Hoader of SBM FABO Gold Member

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          you going to need more that 3500 converter...and more gearing...that is a big cam....

          but it was free...lol
           
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          • Garrett Ellison

            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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            Got W2?
             
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            • 67autocross

              67autocross A new iron curtain drawn across the 49th parallel

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              Free cam= budget build!
               
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              • SSG_Karg

                SSG_Karg Stuck in the middle

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                You’re right. 4 speed it is then!
                 
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                • Garrett Ellison

                  Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                  From the Crane master catalog
                  Good upper RPM torque and HP,moderate competition only, bracket racing, 360+ cu.in., auto trans w/3000+ converter, 12.0 minimum compression ratio advised.
                   
                • 67autocross

                  67autocross A new iron curtain drawn across the 49th parallel

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                  They still sell this thing...it looks like it’s from the 80’s
                   
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                  • Garrett Ellison

                    Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                    While it may be an outdated grind an all, I bet it would still haul ass in a 400 plus inch W2 stroker with 11.5:1 or better compression. You can still get the valve springs for that cam, too.
                     
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                    • 512Stroker

                      512Stroker We are all here because we are not all there.

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                      What is the application?
                      Street? or Strip?
                      This would make a poor street cam.
                       
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                      • Garrett Ellison

                        Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                        Moderate competition only, power from 4400-7600 rpm, valve float at 8000. Definitely a happy four speed cam with 5.13:1 or better gears.
                         
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                        • 67autocross

                          67autocross A new iron curtain drawn across the 49th parallel

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                          Well I do have a new 4 inch stroke 340 forged crank sitting on the shelf...
                           
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                          • 67autocross

                            67autocross A new iron curtain drawn across the 49th parallel

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                            • 70 Buster 340

                              70 Buster 340 Carbon Footprint FABO Gold Member

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                              It'll be miserable on the street... been there.

                              Don't build a car/motor around a cam, pick a cam for your car/motor combo and intended use..
                               
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                              • Krooser

                                Krooser Reform School Graduate

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                                Thats one of the cams that was on my list for my dirt car’s engine redo....
                                 
                              • 66fs

                                66fs Well-Known Member

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                                Sell it or regrind it. Get what you want.
                                 
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                                • 67autocross

                                  67autocross A new iron curtain drawn across the 49th parallel

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                                  I done that a bunch of times...this time I thought it would be interesting to start with the cam and build backwards...
                                   
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                                  • 67autocross

                                    67autocross A new iron curtain drawn across the 49th parallel

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                                    This is not really about what I want for any particular purpose...it’s just about building an engine around a free cam and l will post the build from cam shaft to the dyno...
                                     
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                                    • Garrett Ellison

                                      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                      If it’s a 340, it needs good heads, good rocker gear with geometry corrected, and at least 12-1/2:1 compression, 1-3/4 headers and 340 Victor with an 850-930 cfm carb.A tunnel ram with a pair of 4150 750s would really make it shine. It would be an interesting test rig to compare an M1 tunnel ram to an older edelbrock TR5 and a Weiand TR.
                                       
                                      Last edited: Mar 14, 2020
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                                      • PRH

                                        PRH Well-Known Member

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                                        I put one of those in a 446 bracket motor 30 years ago.

                                        It was “okay”.
                                        I didn’t love it....... and was never tempted to use it again........ but it wasn’t terrible.
                                         
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                                        • 67autocross

                                          67autocross A new iron curtain drawn across the 49th parallel

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                                          I put the call out last night to my local Mopar friends to find me a 340 block as I already have a new 4 inch stroker crank sitting in the shop doing nothing...
                                          so we could do a 416 inch build...or a stock stroke 340...or I could hunt down a 360 block...what do you guys think?
                                           
                                        • Garrett Ellison

                                          Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                          That’s a terribly lazy lifter rate for a solid cam, much less one that uses the Mopar .904 lifter. There are a handful of barely streetable solid lifter cams with that much lift (and several with less lift) that would make much more power all the way across the curve.
                                           
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                                          • 67autocross

                                            67autocross A new iron curtain drawn across the 49th parallel

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                                            A 446 inch small block or big block?
                                             
                                          • 67autocross

                                            67autocross A new iron curtain drawn across the 49th parallel

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                                            I’m 100% sure that much better cams exist and could be ordered...just like a few years ago when I did my “ old school 340” build I used a crane 691191 that I had already in it ...everyone said get a new cam...
                                             
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