ALERT!! SOUND THE ALARM!!..

Mopar Racers Forum

  1. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    I put 340 springs on my 273 and needed to grind a little clearance. Now, the springs I got were advertised as 340 springs but they were pretty fat and the machine made them work. Something I need to change. Probably a 901 Comp would work fine although Isky recommends their dual springs for that cam. Just a mild E 4 grind.

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    • Krooser

      Krooser Reform School Graduate

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      Use a beehive spring...
       
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      • toolmanmike

        toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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        The next time I have the valve cover off I need to get my calipers out and measure the OD of my springs. A spring with a smaller diameter and a little taller would be a good thing. They had to shim the heck out of mine to get the numbers right.
         
      • GreyWizard

        GreyWizard Well-Known Member

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        We put the Speedmaster roller rockers on the heads as they came out of the box. We did move the shims around a bit to improve the alignment. None of the rockers touched the springs but some were really close. I do not know what the consequences may be but will know soon. We plan to install the driveline this weekend with a likely break-in the following week.

        Wish me luck.
         
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        • toolmanmike

          toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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          Hope they work out for you. They should, they are sold by the same company. LOL Here's a photo. The shafts were attached just finger tight and not on a engine with pushrods. I am hoping for the best.

          20191211_155921.jpg
           
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          • j par

            j par Well-hung Member

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            I wish you skill... :thumbsup:...
             
          • j par

            j par Well-hung Member

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            I took a piece of .030 welding wire and slipped it back and forth and when I could do that I was comfortable...
             
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            • toolmanmike

              toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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              I sold a set to a friend (I bought 2 sets) and he tried them on his Edelbrock heads. No go without some grinding.
               
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              • GreyWizard

                GreyWizard Well-Known Member

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                I am not certain any of my rockers had 30 thou. More like 10.
                 
              • j par

                j par Well-hung Member

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                That is cuttin it close...
                 
              • toolmanmike

                toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                Good that the gap gets bigger as the valve goes open but the springs can and will move around a bit in their seats.
                 
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                • 318willrun

                  318willrun Utube channel 318willrun

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                  I'm going to be running mine with the factory stamped steel rockers ....
                  :thumbsup:
                   
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                  • aaronk785

                    aaronk785 Well-Known Member

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                    Bolted on my home ported sm heads this weekend. Nice improvement, not earth shattering but nice. Pulls harder at upper rpms and no loss on bottom by seat of the pants. Only the track will tell. I think my home ported Js where better than I thought. Will have to raise shift point I think. Test and tune coming this month. we'll see.
                     
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                    • j par

                      j par Well-hung Member

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                      I can't remember did you have the fully loaded small block heads? Or did you load them up with your own stuff?..
                       
                    • 318willrun

                      318willrun Utube channel 318willrun

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                      I forget, what cam do you have ?
                       
                    • aaronk785

                      aaronk785 Well-Known Member

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                      I bought the loaded heads and just changed the locks. I did change the valve job also. 70 60 45 30 Cam is howards 254-260 at .050 and .550- .555 lift. Wil run past 7000 easily valve float at 7600 but shift at 6800.
                       
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                      • j par

                        j par Well-hung Member

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                        That should be a formidable test...
                         
                      • Avispa

                        Avispa FABO Gold Member FABO Gold Member

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                        Looks like Jupiter may get colonized a little sooner than I thought, just RX'd a Fedex shipping notice from SM79, then again it may just be a coupon for the next sale, heck at this point it might even pics of the crack rock they bought and smoked with my money!
                        Never ever ever again.
                         
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                        • pittsburghracer

                          pittsburghracer FABO Gold Member FABO Gold Member

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                          It’s been so long I forgot which heads did you order.
                           
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                          • Avispa

                            Avispa FABO Gold Member FABO Gold Member

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                            SB 65cc non cnc and 1.6 rockers, last bandwagon I'll ever jump on!
                             
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                            • pittsburghracer

                              pittsburghracer FABO Gold Member FABO Gold Member

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                              That would leave a bad taste in your mouth. Sorry for your troubles.
                               
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                              • aaronk785

                                aaronk785 Well-Known Member

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                                Avispa. Sorry to here that. I would like to thank PBR and others for their advise. Followed PBRs porting thread to the point where he stopped and a little more short side and floor work. Then valve job.Hope I did ok. we'll see.
                                 
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                                • PRH

                                  PRH Well-Known Member

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                                  Okay...... so your comparison is bowl blended stock heads to SM heads that also have some porting and a valve job?
                                  Not ootb SM assembled heads.

                                  Would you say one set of heads was ported “more” than the other?

                                  Did you test the springs?
                                   
                                • Avispa

                                  Avispa FABO Gold Member FABO Gold Member

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                                  OK, Avispa's realty office is open for business, Jupiter is now colonized and I'm selling craterfront lots on Jupiter!!
                                  All my stuff came in today, heads, 1.6 rockers, intake, already had the main and head studs kits and two gasket sets
                                   
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                                  • j par

                                    j par Well-hung Member

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                                    Now that didn't take long...:lol:..
                                     
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