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Thread: HO Conversion - Mike's Tips and FAQ

  1. #1
    ... mrltd's Avatar
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    Default HO Conversion - Mike's Tips and FAQ

    Though I'd post some of the most common questions I'm asked and a couple tricks I've learned over the years...I'll add more as I remeber them. We can also make this a big FAQ and include all the brake upgrade stuff too...

    HO Conversion, You need:
    E7 Heads (Found on 87-93 Mustangs, 89-92 Lincoln Mark 7's and 87-96 E/F series w/302 (351w has larger head bolts)
    HO ECM, engine computer (Mark 7 to keep cruise on the 88-91 boxes, 86-88 mustang for the 86-87 box)
    19Lb injectors 86-up mustang, 89-92 mark 7, 87-96 E/F series trucks (302/351)... They have an orange top.
    HO upper intake 87-93 Mustang, 89-92 Mark 7
    HO Throttle body
    HO cam 86-93 Mustang, 89-92 Mark 7


    The 2 modifcations needed:
    The linkage arms on the throttle bodies need to be swapped. It's easy and straightforward. Grind, swap reattach with screw, JB weld, or actually weld it. The EGR spacer will need to be enlarged to 63mm. A couple minutes on a lathe fixes it up. The 93-95 Ford lightning and some Aussie Fords use a similar EGR spacer if you can find it.

    Common misconceptions:
    1. Wiring. There are NO changes to the wiring for the HO conversion.
    2. Wiring . There are NO changes to the wiring!

    To help you get the most out of the HO conversion:
    Dual Exhaust. 2.25" minimum.
    Headers. Mustang shorties work with some modification, most people get the H-pipe too and get a cat back exhaust done.
    Trans: Mustang/Mark 7 Governor. Raises the shift points to match the engines power band.
    Fuel pressure, some can get away with the stock pump. But not all. Check your fuel pressure and make sure it's good at WOT.


    Other tips/Tricks
    1. Timing is everything! Make sure your timing is correct. If it's off, it'll kill your power and milage. Bump it to 12-14* for a little extra HP, just pay attention to detonation, if it happens, back the timing off.

    2. Speedo swap. Very common thing, every one wants a 140 PI speedo, but what about the milage? The odometer comes apart pretty easily. pop the pin out and set the milage. To help keep the numbers aligned while you reassemble, put some tape across the opposite side of the numbers to hold them in place.



    Mike's 16 second lopo recipe:

    Pretty simple recipe. HO upper, TB, and bored lopo EGR spacer. Mustang headers, 2.5" header back exhaust, 3.73's, 2200 Stall lockup converter, rebuilt AOD w/ shiftkit, smog pump removal, electric fan, removal of WP driven fan, 110lph fuel pump, and a custom cold air intake. Lots of timing too. I tuned it by ear and timeslips. I also ran 26" tall tires instead of the 27" tall stock tires, which helps for gearing. My trunk was bare. I never ran with more than half a tank of gas. Iced the intake between runs. The car should have been much quicker, but the frame was horribly bent and ruined the launches. The best the car ever got, even with the HO was 2.18.

    And since all the supporting stuff was already done, when I did the heads and cam, I dropped from the 16.03 to a 15.54! The car was far from pretty, but it worked great.




    Misc Info:

    TB sizes.
    Lopo = 55mm
    HO= 60mm
    Explorer =65mm
    Last edited by 88grandmarq; 07-09-2009 at 01:04 PM.

  2. #2
    I'm an air-conditioned gypsy gadget73's Avatar
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    86-87 boxes don't have integrated cruise, so the ECM selection doesn't matter.

    theres also that bit about boring out the stock EGR spacer or drilling/tapping the HO one to work once the intake is spun around.


    just thought i'd throw that little bit of trivia in there. good stuff tho.

    86 Lincoln Town Car (Galactica).
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    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

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  3. #3
    Locked and Loaded, ready for the rebellion. RugerP97DC's Avatar
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    If I were going to replace heads and cam, I would just rebuild the engine. Get it aligned, bored and cleaned. Not saying go .030 over or anything, but just get the wall reconditioned. Get the crank and rods machined and have a new engine.

    Just my $.02
    2008 Mercury Grand Marquis GS Bone Stock

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  4. #4
    Ford Fanatic Mercracer's Avatar
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    Quote Originally Posted by blazingstang
    If I were going to replace heads and cam, I would just rebuild the engine. Get it aligned, bored and cleaned. Not saying go .030 over or anything, but just get the wall reconditioned. Get the crank and rods machined and have a new engine. Just my $.02
    Or just buy a low mileage Explorer motor and save time/money + start with a better performing engine to begin with.
    Factory E7 heads suck...........

  5. #5
    Domestic Tourist Lincolnmania's Avatar
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    i love my thumper e7's...............and i still think that at $599 they were a deal...........i was quoted 300-350 for a valve job and resurfacing on a set of uded e7's
    scott

    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!


  6. #6
    ... mrltd's Avatar
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    Yeah, I forgot the EGR spacer deal..


    As for the engine rebuild. It's not always needed. I swapped mine out at 160K miles and ran it over 250K. And it still, over 3 years later is one of the fastest boxes around. Still runs great, though the oil pressure is non existant. This time around I went with a complete brand new 96 explorer motor. There are alot of parts to swap out, but for $1550 the deal was too good to pass up. GT40 heads, brand new longblock, GT40 style intake...

  7. #7
    ... mrltd's Avatar
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    Mike's 16 second lopo recipe:

    Pretty simple recipe. HO upper, TB, and bored lopo EGR spacer. Mustang headers, 2.5" header back exhaust, 3.73's, 2200 Stall lockup converter, rebuilt AOD w/ shiftkit, smog pump removal, electric fan, removal of WP driven fan, 110lph fuel pump, and a custom cold air intake. Lots of timing too. I tuned it by ear and timeslips. I also ran 26" tall tires instead of the 27" tall stock tires, which helps for gearing. My trunk was bare. I never ran with more than half a tank of gas. Iced the intake between runs. The car should have been much quicker, but the frame was horribly bent and ruined the launches. The best the car ever got, even with the HO was 2.18.

    And since all the supporting stuff was already done, when I did the heads and cam, I dropped from the 16.03 to a 15.54! The car was far from pretty, but it worked great.
    Builder/Owner of Badass Panther Wagons

    Busy maintaining a fleet of Fords

  8. #8
    ... mrltd's Avatar
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    TB sizes.
    Lopo = 55mm
    HO= 60mm
    Explorer =65mm
    Builder/Owner of Badass Panther Wagons

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  9. #9
    I post a lot... 88Vic's Avatar
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    Another question: what needs to be done to change to LOPO firing order to the 302HO/351W firing order? Can this be done without doing a HO conversion?
    88 Town Car (wrecked, for sale)
    Walker OEM duals with muffler deletes

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    The cam shaft determines the firing order and the computer needs the match the cam.

    Although, I ran my car with a mix-matched cam and computer setup (cant remember which) - it ran but the fuel was injected into four of the cylinders too early lowering my mileage to around 150mi/tank. It was only a stop-gap until I had the right parts.
    -Matt
    1968 Fairlane 500 - 1998 Camaro Z/28

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    Minivans are tangible evidence of Evil.. 85MercPark's Avatar
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    Quote Originally Posted by mrltd
    It's really not that difficult, if you have a donor harness.
    True, but couldn't take the Merc out of service that long. Maybe in a few years I can get a third car and put the Merc in the shop for an extreme makeover. I am thinking a mild 351 set to tow would be ideal. Don't really need a racer, just a good solid torgue monster.
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  12. #12
    Dave84
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    H.O's have a differnt fireing order 2 do they not? so would they have a differnt crank to? or no?

  13. #13
    Resident Panther expert in training
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    Quote Originally Posted by Dave84
    H.O's have a differnt fireing order 2 do they not? so would they have a differnt crank to? or no?
    Nope, same crank
    Nick
    88 Colony Park LS
    G-pa's old car, but he's cruisin around heaven in his 69 wagon now
    Future plans:Semi HO conversion, or Explorer motor swap, shift kit, PI springs and sway bars, KYB-GR2 shocks

  14. #14
    ... mrltd's Avatar
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    Quote Originally Posted by Dave84
    H.O's have a differnt fireing order 2 do they not? so would they have a differnt crank to? or no?
    Is a crank in the list of needed parts? NO. The cranks are the same between the lopo and HO. The shortblocks are identical except for pistons and camshafts. The camshaft is what determines the FO.
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  15. #15
    Usual Suspect Freshmeat's Avatar
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    Quote Originally Posted by mrltd
    TB sizes.
    Lopo = 55mm
    HO= 60mm
    Explorer =65mm
    Are you sure? I thought SO was 50mm and '86 HO was 55mm...
    2011 Mustang GT Premium, MT82, Kona/Saddle, HIDs, 3.73s, 19s, hood/side stripes, UPR 1.5" springs with adjustable panhard bar, and UMI solid LCAs and relocation brackets.
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  16. #16
    ... mrltd's Avatar
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    It's all BS anyway. Not like anyone even cares. Just toss an aftermarket 70mm on it or swap to carb....

    Prolly a typo, but I can't edit it anyway.
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  17. #17
    Minivans are tangible evidence of Evil.. 85MercPark's Avatar
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    Quote Originally Posted by Dave84
    H.O's have a differnt fireing order 2 do they not? so would they have a differnt crank to? or no?
    They basically just swapped some cylinders from a compression stroke to an exhaust stoke. Not sure why, but I guess it makes more HP some how.
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  18. #18
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    Quote Originally Posted by 85MercPark
    They basically just swapped some cylinders from a compression stroke to an exhaust stoke. Not sure why, but I guess it makes more HP some how.
    The lopo runs smoother, but is harder on the bearings. The HO takes the stress off the mains, but isn't as smooth. That's why all lopo's have that knock.
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  19. #19
    Member OVERKILL's Avatar
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    The 302 lopo firing order is the same as the small block Chevrolet (actual cylinder firing order, not numerically). The 351/302HO firing order (1-3-7-2-6-5-4-8 on the Ford, 1-8-7-2-6-5-4-3 on the LS1) was adopted by GM for the LS1 because its just simply a better firing order; much more even force distribution along the crankshaft which GREATLY reduces bearing wear and results in a longer lasting engine that will stand up to a lot more abuse.
    Last edited by OVERKILL; 12-19-2006 at 04:37 PM.
    1989 Town Car Cartier: 3G Alt. Upgrade, Mark VIII Electric Fan, Police Interceptor Suspension, 40-series Flows, loaded. HO+ Conversion: E7 heads, Cobra 1.7RR's, Explorer intake, 65mm TB, FMS "E" Camshaft, 4-hole 19lb/hr injectors, A9P ECM, 76mm C&L MAF, BBK CAI. 338,000Km, stock bottom-end.

  20. #20
    WARNING DON'T DERP AND DRIVE!
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    Quote Originally Posted by mrltd
    The lopo runs smoother, but is harder on the bearings. The HO takes the stress off the mains, but isn't as smooth. That's why all lopo's have that knock.
    Oh I did not know this that could explain a lot and so could a sound bite of Vicky she has this ?scream? like its coming from a bearing or something? it's somthing you would have to hear in order to know what it is......

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