Need some help from my head machining buddies

Mopar Racers Forum

  1. PRH

    PRH Well-Known Member

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    John, the bits are usually in the $30-45 range, depending on what it is.

    Buy the bit with the profile you want, and bring it with your heads to the shop...... and say, “use this”.
     
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    • replicaracer43

      replicaracer43 Grumpy Old Man

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      Goodson and Silver Seal both sell the cutters with the multiple angles, and there are a BUNCH of different ones to choose from
       
    • pittsburghracer

      pittsburghracer FABO Gold Member FABO Gold Member

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      Ya I checked out my Goodson book last night and again today.
       
    • replicaracer43

      replicaracer43 Grumpy Old Man

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      Go online and request a silver seal catalog, you can thank me later!
       
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      • PRH

        PRH Well-Known Member

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        You would just need to verify with the shop you use that they do in fact have the tooling to use that style of cutter.

        That type of tooling is fairly universal these days....... but not “everyone” has it.
         
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        • PRH

          PRH Well-Known Member

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          One of my customers used to have a speed shop/machine shop.
          He sold it off probably 12-15 years ago.
          He kept a small group of his circle track customers that he still does motors for, and he brings me the heads for the guide and seat work for those jobs.
          There is often a little discussion about what angles he wants, and what chamber or bowl cuts that may be needed, etc.

          If you’re looking to have something done a certain way, don’t assume the guy at the machine shop is a mind reader....... have the talk and discuss it.
           
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          • skrews

            skrews Well-Known Member

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          • pittsburghracer

            pittsburghracer FABO Gold Member FABO Gold Member

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            Signed up for a catalog. Thanks.
             
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            • pittsburghracer

              pittsburghracer FABO Gold Member FABO Gold Member

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              9F79C049-9A02-49FD-AC2F-8D1FA3A77330.png I would love to play around with that number 2
               
            • yellow rose

              yellow rose Overnight Sensation FABO Gold Member

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              Look at the 50 degree cutters while your looking around.
               
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              • pittsburghracer

                pittsburghracer FABO Gold Member FABO Gold Member

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                Having so many sets of Edelbrock and now a set of Speedmaster heads laying around I like the ability to interchange parts from head to head. Once I start going away from “standard” valve angles I lose that. Standard angles have been pretty good to me over the years.
                 
              • PRH

                PRH Well-Known Member

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                Often times with those cutters that have multiple angles above the seat...... there isn’t enough radial clearance in the chamber before the cutter OD starts carving out the chamber wall.

                Sometimes that’s a problem...... sometimes it’s not.

                Also, many heads will require sinking the valve a fair amount to be able to utilize all the angles.

                Sometimes that causes issues on the top side of the head with regards to tip heights and installed heights.

                It can turn into a “be careful what you wish for” scenario.

                It’s playing with that type of thing where having access to your own machine really comes in handy.
                 
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                • pittsburghracer

                  pittsburghracer FABO Gold Member FABO Gold Member

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                  Don’t ask me why but the piss poor small block Edelbrock type head chamber likes to be sunk a little to slide a 15 degree top cut on it. It’s worth at least 6-8 cfm. My thinking is it raises the airflow up off the chamber floor and avoids crashing into the almost vertical back wall.
                   
                • skrews

                  skrews Well-Known Member

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                  The deshrouding cutter I commonly use has a °15 bottom angle to it. My "go to" performance intake profile is °35 x .080" top °45 x .040" seat °65 x .100" bottom.
                   
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                  • pittsburghracer

                    pittsburghracer FABO Gold Member FABO Gold Member

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                    First off thanks for suggesting Silver Seal. I requested a book as suggested and received it yesterday, great service. I called Goodson today to see if tooling was still available and undateable and he said yes. Looks like for a few hundred dollars in tooling and 175-200.00 for a phase inverter I cut be grinding seats. I told my buddy 2000.00 for the machine plus new tooling was more than I wanted to spend so he said he could drop it to 1500.00 but since he is going south it won’t be available till around May which is fine with me. That gives me more time to think things over. I sold a head and block cutter for him to another friend of ours for 2500.00.
                     
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                    • moper

                      moper FABO Gold Member FABO Gold Member

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                      I just sold my Peterson TCM-25 with the better fixture and all tooling and manuals for it. It’s a great machine and you should be able to cut whatever you want. Only real issue is the spindle rpms are preset (gear selection) not fully adjustable like more modern stuff. Also the table floats vs the head but on most old stuff that’s fine.
                      IMO $2k is a lot if it’s been dormant all this time.
                       
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