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Cutting Bits for Porting

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  • #16
    I used a 5 pice carbide burr kit from MM tools on ebay. Theyre 3in long. Wish I got at least one 6in burr to get to the deeper places. Even though my CB were not for aluminum, they chewed fast thrugh it but loaded up the bit with aluminum if I wet full speed on the air tool. Perfered if you used a variable speed air tool, some are just one speed. Or hard to controll slow or too fast. AirCat is a good one. Used tranny fluid. Its a dirty job but its worth it. Go slow and get a good hand on the tool or it will walk away from you. Used flap wheels with sand paper from Home depo to smoth out the porting surface using a rotory tool.
    88 Beretta GTU turbo . 90 Black ASC/McLaren TGP, awaiting 4t80. 2003 Grand AM se 3400/4t45 daily grind.

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    • #17
      If you go air, the astro pneumatic T210 is by far the best I have ever use. At under 30 bucks, its a steal. Japan bearings make a difference. My first lasted 7 years and I used it much more than most people will. I now have 2, for backup cause using anything else just sucked. Vibration when porting is a major turn off.
      Ben
      60DegreeV6.com
      WOT-Tech.com

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      • #18



        that's what i use, typically kill a whole kit for porting a top end.

        also i have 2 carbide cutting bits that i do the major shaping with.

        Here is my porting/polishing drawer..



        and those 2 carbide bits..

        Past Builds;
        1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
        1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
        Current Project;
        1972 Nova 12.73@105.7 MPH

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        • #19
          Cool thanks Dave, where did you get those carbide bits from?

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          • #20
            Originally posted by Venom View Post
            Cool thanks Dave, where did you get those carbide bits from?
            the local true value hardware store had them.. iirc they were around $10 each but well worth it.
            Past Builds;
            1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
            1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
            Current Project;
            1972 Nova 12.73@105.7 MPH

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