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  1. #31
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    Like this...


  2. #32
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    could you do the grinding on a NC mill as in production line stuff?

  3. #33
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    No no fingers in a 2.7 and its very rare to find a 2.7 block that even has finger port bosses.



    Quote Originally Posted by wired247 View Post
    Like this...
    You cannot cut there on a 2.7. There is no boss there. 1998ish and up 3.0 and 3.3 have a boss but its still not a strait shot into the boost.

    Dont dig too deep on the rod slots for a low rpm motor. You will loose primary compression and power will suffer through most of your useable RPM range.

    Stuff the crank case as much as you can. Theres a ton of room (read volume) to fill in the intakes around reed blocks and you can take .090 off the front half without having to grind too much (except #1 u have to grind a bunch, you will see why).
    Quartershot T-3R 15" E-Tec 1.62 sportmaster


  4. #34
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    Quote Originally Posted by wired247 View Post
    Like this...

    Perfect,pictures, now thos thread is going where I wanted it to go... There is not too much tuning-pics on this site.

  5. #35
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    Quote Originally Posted by Onetime View Post
    I remember many years ago making a mistake converting mm to inches on a machining job and had to scrap a part.

    Don't remember the exact numbers but when my boss asked how I converted I stated using 25.4. Got my butt chewed out for using that and told to use only .03937. So it stuck.

    Probably was a mistake on my part entering the numbers into the calculator
    0.039370 X 25.4 = 0.999998 inches. So your boss kicked your butt for being out 2 millionths of an inch in one inch. Put that into perspective. If the part was 500 inches in diameter you were out 1 thousandth of an inch. That is precise machining! Sounds like your old boss didn't understand the metric system, or he was blaming you for his error. Australia converted to metric in 1970, and doing metric/imperial conversion is like eating breakfast for many here. It is a daily occurrence. I am old enough to be proficient in both systems, but give me metric any day. I use 25.4 mm/inch. With the level of accuracy required for porting an engine with hand tools, it doesn't matter whether you use 25.4 mm/inch or 0.03937 inch/mm.

  6. #36
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    Quote Originally Posted by GregAdams View Post
    0.039370 X 25.4 = 0.999998 inches. So your boss kicked your butt for being out 2 millionths of an inch in one inch. Put that into perspective. If the part was 500 inches in diameter you were out 1 thousandth of an inch. That is precise machining! Sounds like your old boss didn't understand the metric system, or he was blaming you for his error. Australia converted to metric in 1970, and doing metric/imperial conversion is like eating breakfast for many here. It is a daily occurrence. I am old enough to be proficient in both systems, but give me metric any day. I use 25.4 mm/inch. With the level of accuracy required for porting an engine with hand tools, it doesn't matter whether you use 25.4 mm/inch or 0.03937 inch/mm.
    how about whitworth and BA threads

  7. #37
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    Is that relevant?

  8. #38
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    Ha Whitworth should never had been "relevant". IMO Gary

  9. #39
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  10. #40
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    Quote Originally Posted by olboatman View Post
    Ha Whitworth should never had been "relevant". IMO Gary
    yes we wish
    BUT the whitworth thread form is the strongest there so says late great Carroll Smith
    70's OZ had pommy cars with ****worth bolts along with their custom spanners, i remember that as much as thou and mm
    thou being more useful measurement like a 2x4
    Last edited by powerabout; 11-28-2013 at 08:05 AM.

  11. #41
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    Quote Originally Posted by powerabout View Post
    yes we wish
    BUT the whitworth thread form is the strongest there so says late great Carroll Smith
    70's OZ had pommy cars with ****worth bolts along with their custom spanners, i remember that as much as thou and mm
    thou being more useful measurement like a 2x4
    I understand what your saying--- After owning a couple of British bikes and dealing with trying to find their fasteners or retap, I guess I just didn't like change! (still don't) Gary

  12. #42
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    the poms and yanks should have sorted it in 1700 something and we would have the best of both
    metric is just a fudge to have decimal engineering threads, they are crap so we should have imperial threads and spanners but drill the holes with metric spacing as it works for that.
    Half the population is female and other half male, that works

  13. #43
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    How bout the V4 block?

    Thinking about using the Dave Bush 3.0L sleeves in the V4 Block.

    Anybody out there done this ?

  14. #44
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    You will need to loose the bridge in the exhaust and machine finger ports in the block.
    Quartershot T-3R 15" E-Tec 1.62 sportmaster


  15. #45
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    Maybe we can get this thread back on the OP's subject now. Captain, we've been getting some good info. Hopefully more will chime in with their experience and results. I've learned a lot so far and will be using the info to assist with my 2.7 Bridgeport overhaul.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

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