ProComp/Speedmaster aluminum heads

Mopar Racers Forum

  1. j par

    j par Well-hung Member

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    Screenshot_20191018-075009.png
     
  2. PRH

    PRH Well-Known Member

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    You do know what the term “over the nose” refers to, right?

    So....... installed at what height, and at what valve lift do you achieve 382lbs over the nose with that spring?
     
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    • j par

      j par Well-hung Member

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      At the cams highest lift..?
      I'm "assuming" like cam manufacturers giving a @50, there's a general lift there giving these numbers ?..
       
    • j par

      j par Well-hung Member

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      I noticed when my 202 valves were installed they left the same Springs in there from the 188, but something about
      -.050 keepers. I'm assuming the new 202 valves needed the springs majorly shimmed..
       
    • PRH

      PRH Well-Known Member

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      I think you should do a little more homework on spring heights and loads.
       
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      • j par

        j par Well-hung Member

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        Captain Obvious what do you think I'm doing!?... I'm not running down and trying to bang a Sheep, I'm trying to walk down and bang them all...
        I'm taking my time asking questions. Is there any reason that I couldn't use the Springs at I haven't seen the crap out of him using shims and offset retainers or keepers?..
         
      • PRH

        PRH Well-Known Member

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        I’ve told you exactly how to do it, but you want to go about it some other way.

        My way starts with you finding out what the spring requirements are for your current cam.
        Either call the cam grinder and ask them, or measure the installed height of the springs that are on the motor now(this assumes the current springs are set up correctly for the cam) and look at the chart on the Crower site and see what the loads are for your spring, at that installed height, and your lift.
         
        Last edited: Oct 18, 2019
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        • justinp61

          justinp61 Well-Known Member

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          Last edited: Oct 18, 2019
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          • justinp61

            justinp61 Well-Known Member

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            Dwayne, what you'll figure out is that a lot of times jpar isn't looking for the right answer, just for reaffirmation on his way of doing things.

            I'm not beating on you jpar, but I've read a bunch of your posts over the years and most follow the same pattern and this one is no different.
             
            Last edited: Oct 18, 2019
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            • PRH

              PRH Well-Known Member

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              That’s why I suggested option “c” ;)

              There are some typos/erroneous info referring to the “spring rate” in that “Valve spring tech” article.
              The installed height load is not rated at “pounds per inch”....... it’s just “pounds”.
              If you don’t really understand spring specs, that could be confusing to someone.
              The “spring rate” is determined by the change in load over a specified distance.

              I see those types of misprints in magazine tech articles all the time.
               
              Last edited: Oct 18, 2019
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              • lead69

                lead69 hopeless car junkie

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                Well there you go Jpar,if you can wait that long!.
                 
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                • 318willrun

                  318willrun Roadkill '80 D150

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                  Shoot.... just check that the valves are sealing, if not lap 'em. Your cam isn't THAT big. If those springs that came with those heads won't take a .520 lift, then Chopsticks to lamb chops! I say run 'em!
                   
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                  • j par

                    j par Well-hung Member

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                    The heads are still in their boxes on the Shelf where I put them the day after I got them. One thing about me I've always figured there's a few different ways to skin a cat... (Clutch tamer).. if I had my mind completely wrapped around this I would have stopped asking questions.
                    Fortunately I was just pm'ed by a member who gave me the mathematical formula..
                    Math I understand!
                    When I was a kid and started doing foundations for work of course I start out laboring. As I gained a little more knowledge I noticed the foreman would always keep the plan to themselves and figure out the squares and just kind of tell you what to do to keep you dumb and stupid and working.. when I finally started running my own crew all my men knew how to read the plan and figure their own Pythagorean theorem to square a Foundation in..
                    Appreciate you giving me a good direction and good advice. What I'm looking for now is the other ways for skinning cats if there is any? Like something I didn't know was that when I went to 202 valves they used the same springs, but needed more shims and -50 keepers.. -50 keepers? Oh so there's other ways of doing things...
                    ultimately again I appreciate your help and I see no reason why I won't follow your formula when the time comes. As of right now I'm waiting for maybe a Black Friday sale or something for the bolts...
                     
                  • j par

                    j par Well-hung Member

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                    100% my money my car my way or the highway...
                    I refuse to be a sheep...
                     
                  • fishmens67

                    fishmens67 Well-Known Member

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                    I'd hate to be that cat. lol
                     
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                    • yellow rose

                      yellow rose Doctor of Thinkology.

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                      Oh...DOING!!!!!
                       
                    • 318willrun

                      318willrun Roadkill '80 D150

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                      Post 987 - my way of skinning the cat didn't even get noticed :eek:
                       
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                      • PRH

                        PRH Well-Known Member

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                        More than one way to do it?
                        Sure...... there’s at least two.
                        The right way......... and the wrong way.

                        There’s really only one right way to set up heads....... which is to match the spring loads in accordance with the requirements of the cam profile, along with all the matching components, and desired rpm range.

                        There are tons of ways to do it wrong though.
                         
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                        • fishmens67

                          fishmens67 Well-Known Member

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                          cause he's scared. lol He's getting advise from those who build high end stuff.
                           
                        • j par

                          j par Well-hung Member

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                          Like I said I got a p.m. with the other half of the puzzle...
                           
                        • 318willrun

                          318willrun Roadkill '80 D150

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                          THanks YR for the PM :)
                           
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                          • j par

                            j par Well-hung Member

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                            There you go panning for that disagree button...
                            I was saving up for the big answer I had to eat dinner...
                            I'd skin the cat your way if it was some junkyard 318 or 360 but it's not...
                            I'll be disassembling and checking the spring rates you can Bank on that...
                            Not saying I won't put it all back together and run it, just I will check things out. It's basically free to take them apart and take them down to a shop..
                            Anyways don't you have a van to buy...
                             
                          • j par

                            j par Well-hung Member

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                            Funny...
                            EDIT: Toke.gif
                             
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                            • 318willrun

                              318willrun Roadkill '80 D150

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                              • It's a soon to be 7k stroker, I get it
                              • check'n spring rates is a good idea. Peace of mind...
                              • Look'n, been look'n for a van. Like always, they are everywhere till poor ole' 318alreadyhaswon wants one.... :(
                               
                            • j par

                              j par Well-hung Member

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                              and pretty soon you'll have 7k into two dusters and a van that don't have enough horsepower combined to get out of their own way....
                               
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