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power gains on a basic ho conversion?

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    power gains on a basic ho conversion?

    what are the differences in power between the lo-po and the ho 5.0's?

    and if i do just the upper part of the motor how much of that difference would i lose?

    if the loss is anything more than 5-10hp with just doing the upper part of the motor, i'll save myslef the trouble and just hold out for a complete ho motor, and i'll just swap my accessories onto it.

    btw which mark7 computer do i want? i forget whether somebody said 88 or 89
    Save a seal, club a liberal.

    lopo 302= 150 hp...........302 ho= 225 hp
    eric got 188.1 rwhp from his ho converted 302 in his 88 grand marquis
    theres not much difference there, just need the ho goodies installed

    1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
    2006 Lincoln Town Car Signature. Stock for now
    1989 Ford F-250 4x4 much much more to come, sefi converted so far.
    1986 Toyota pickup with LSC wheels and 225/60/16 tires.
    2008 Hyundai Elantra future Revcon toad
    1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

    please be patient, rebuilding an empire!


      To be honest, my car saw the most performance improvement with E7 heads and more gear.
      Surprisingly, I saw NO power or performance increase with HO cam, 19lb injectors or HO ECM.

      If I had to do it all over again, I would do; E7 heads, HO upper/throttle body, headers with a good dual exhaust, 3.27 or 3.55 gear and some mild trans upgrades.
      Maybe port the lower intake and run 1.7 rockers to get more lift on the stock cam.

      Skip the HO cam, injectors and ECM

      oh... and about the ECM, any mark 7 ecm from 88-92 should work. but I hear the 89 model is the best, ECM code D9S. Its supposed to have a more agressive fuel map and spark curve.
      2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
      89 Crown Victoria LX HPP -- SOLD 9/2010
      88 Grand Marquis LS - The Original -- Totaled 5/2006

      I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page:


        MARK 7 Bitches! j/k

        I guess I should look for one to replace the 90 ecm.


          good info guys, thanks

          what i might do is hold out on a complete ho out of a wrecked stang or mark 7 and take it from there
          Save a seal, club a liberal.


            i was looking at some aftermarket upper intakes and it seems they're all setup for a mustang with the tb on the passenger side. that wouldn't exactlyjive with an aod,lol

            can an aftermarket upper be reversed?

            this was one i was looking at, mainly for some flash under teh hood.

            Save a seal, club a liberal.