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Thread: HO Conversion - Mike's Tips and FAQ

  1. #161
    Beater gonna beat sly's Avatar
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    I wouldn't touch it until you're ready to modify stuff. Leave it alone until you actually need to pull it.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
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  2. #162
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    I've decided to leave it and just start piecing together my new combo. To get dropped in come spring.

    Sent while like doing stuff and what not.
    1990 Crown Vic - Lowered, E303 cammed, Short tube headers, H-pipe and Thursh welded mufflers dumped....MANY UPDATES COMING
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  3. #163
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    Hey fellas, I know this is an old thread, but looking for a little advice. 91cv lopo 80k bone stock except radio. Want to do ho conversion, but hate to tear into such a good running car but it's a slug. Opportunity to get running stock motor out of 92 mustang on the cheap. Unsure on miles, but it's all there. Is it worth going through that motor and dropping in rather than fooling around building Frankenstein? Plan to regear rear discs and add dual exhaust. Do I need an ecm swap? Guessing if I go back someone has answered that one.

  4. #164
    I post a lot... mitymerc's Avatar
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    If it is a good running engine and doesn't use excessive oil I would run it. Maybe do a Regasket just to be safe. If you use an HO cam you must use a compatible ECM.

    10 Escape LTD. V6 AWD, K&N, Bullitt wheels.

    87 Ford LTD Crown Victoria Country Squire Station Wagon. 4.10's, Repacked Trac Loc, Boxed LCA's, Explorer Intake, 65mm T-body, 'Stang Cam, 'Stang Air tube, K&N, GT-40X Heads, 1" Spacer, 1 5/8 BBK's, 2.5" Pypes X-pipe w/high flow cats, Single Chamber Thunderbolts, B&M 'vertor, Po-lice Swaybars.

    91 Mercury Grand Marquis Colony Park Station Wagon. K-Code, 4.10's, Repacked Trac Loc, MK VII LSC Engine, 'Stang Upper Intake, Stang Air Tube, K&N, 65 mm T-Body, 'Stang Headers, 'Stang Cat Pipe,'Stang Torque Convertor, 2 Chamber Thunderbolts.

  5. #165
    GMN Regular DerekTheGreat's Avatar
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    What mity said. If I was going to do a swap, I'd just throw a whole engine in there (after regasketing it) and be done with it. I'm leaning toward an exploader motor these days but honestly, I'd never swap my Townie. I don't drive it daily any more and for the weekend cruising or ice cream shop runs it does nowadays it's perfect and original.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  6. #166
    Beater gonna beat sly's Avatar
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    D9S would be the plug and play ECM. The stock ECM will NOT run the HO engine.

    Also, you'll want to replace the shift governor in the transmission and the torque converter with a 2300-2500 (or up to 2800) stall converter or it'll be an even bigger slug off the line until you get into the 2500+ RPM power band of the HO.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  7. #167
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    I think I can get the tranny as well. It's an aod I think I read stall is 1600 to 2200 in it stock. Thought it would be good fit but not against upgrade.

  8. #168
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    I have a Mustang 'vert in the Megamerc, I never drove it w/the stock one so I can't give a comparison. Theory would hold that the stall would be higher in a heavier car.
    Last edited by mitymerc; 01-25-2019 at 12:18 AM. Reason: speeling

    10 Escape LTD. V6 AWD, K&N, Bullitt wheels.

    87 Ford LTD Crown Victoria Country Squire Station Wagon. 4.10's, Repacked Trac Loc, Boxed LCA's, Explorer Intake, 65mm T-body, 'Stang Cam, 'Stang Air tube, K&N, GT-40X Heads, 1" Spacer, 1 5/8 BBK's, 2.5" Pypes X-pipe w/high flow cats, Single Chamber Thunderbolts, B&M 'vertor, Po-lice Swaybars.

    91 Mercury Grand Marquis Colony Park Station Wagon. K-Code, 4.10's, Repacked Trac Loc, MK VII LSC Engine, 'Stang Upper Intake, Stang Air Tube, K&N, 65 mm T-Body, 'Stang Headers, 'Stang Cat Pipe,'Stang Torque Convertor, 2 Chamber Thunderbolts.

  9. #169
    I'm an air-conditioned gypsy gadget73's Avatar
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    reasonably sure they all got the same converters, even though a higher stall would be more appropriate for the HO engine. The low rpm torque production is not very good with the stock HO. They don't "turn on" till about 2500 rpm.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

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

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
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  10. #170
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    Question about Valve covers.
    I'm kinda fond of the original '86 valve covers that I have. I'm sure the oil filler on the passenger side won't jive with the Explorer upper.
    So.. Has anyone found a decent solution for this.?
    I've read on a few other threads that there have been issues.
    Ideas.?
    Pix.??
    Thanks.
    All FORD All The Time

  11. #171
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    The Explorer upper should clear the filler. We used the regular ‘86-‘91 valve covers on TecNickal’s Explorer swap and it fit fine.

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  12. #172
    I'm an air-conditioned gypsy gadget73's Avatar
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    Stock valve covers should be fine. If you really need more clearance, use a cutoff wheel to slice about halfway through on the front side of the fill neck about 1/4" above the cover, tap it forward until the gap closes. Widen the slot as needed until it fits, then just weld the fill tube back up.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

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

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  13. #173

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    I already posted in another forum about an intake swap, but I haven't been able to find a solid writeup on swapping a better upper/lower/throttle body onto an otherwise stock 1987 Grand Marquis 5.0. So I thought maybe this thread would be a great place. I've still got all my smog stuff, but the tubes to the exhaust are pinched/welded shut. I just had the exhaust done and it's stock manifolds, 2 inch catless downpipes going to 2.5 inch true duals with a glasspack on each side. Ran all the way out the back.
    My stock cats were clogged, and I'll probably get headers so I can have 2.5 inch downpipes. I know the stock lopo doesn't need that. But I'd rather be ready for upgrades as I go and start from the outside in. Especially at 85k original miles.

  14. #174
    Wagon Addicted Tiggie's Avatar
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    You can run a stock HO upper and throttle body on your current lower (they are the same). Get your EGR spacer bored to match. Keep the stock computer and all with this setup. Don’t expect huge gains.

    You can do more but with an an otherwise stock long block, it’s not much to be gained. The cam and the heads are the real bottle necks.

  15. #175
    I'm an air-conditioned gypsy gadget73's Avatar
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    honestly there isn't much advantage to a better intake on an otherwise stock motor. People have put Explorer intakes on and it lost low end torque without gaining much on the top end. The HO upper and throttle body is really the only thing you want to do with it. Beyond that its just money and tears until the heads are upgraded.

    Removing the H pipe also doesn't do you any favors.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

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

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  16. #176

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    Quote Originally Posted by Tiggie View Post
    You can run a stock HO upper and throttle body on your current lower (they are the same). Get your EGR spacer bored to match. Keep the stock computer and all with this setup. Don’t expect huge gains.

    You can do more but with an an otherwise stock long block, it’s not much to be gained. The cam and the heads are the real bottle necks.
    Honestly, I just want it to be a bit more responsive. I know I won't see the difference I did on a Chevy smallblock in a '72 C10 when I went from a 2bbl to a 4bbl carb and 2.25 inch true dual exhaust. But, anything would be nice until I delegate it as the car to be taken apart. Right now that's a '77 Plymouth Volare with a (mostly) built 318 in it.

    I did plugs and wires on it last night, autolite plugs so maybe they'd been changed before, but the plug wires said 1987 on them, so they were on it when the car rolled out of the factory for sure. That made it more responsive immediately.

  17. #177

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    Quote Originally Posted by gadget73 View Post
    honestly there isn't much advantage to a better intake on an otherwise stock motor. People have put Explorer intakes on and it lost low end torque without gaining much on the top end. The HO upper and throttle body is really the only thing you want to do with it. Beyond that its just money and tears until the heads are upgraded.

    Removing the H pipe also doesn't do you any favors.
    Yeah, I'd eventually want to do heads, but don't want to take it that far apart right now. Kinda gathering parts/doing small stuff first.

    I've never ran an H or X pipe or any kind of crossover on a v8 engine. Even in 600-700 horsepower applications, never had an issue. Besides, it gets in the way of dropping transmissions, driveshafts, etc. And no cross pipe always sounds better, people always wonder why my engines don't sound like all the rest.

  18. #178
    I'm an air-conditioned gypsy gadget73's Avatar
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    The H pipe actually flows better than straight duals, makes more torque. personally I think it sounds better but thats entirely subjective.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

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

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  19. #179
    I post a lot... mitymerc's Avatar
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    H, X balance the exhaust pulses for better scavaging.

    10 Escape LTD. V6 AWD, K&N, Bullitt wheels.

    87 Ford LTD Crown Victoria Country Squire Station Wagon. 4.10's, Repacked Trac Loc, Boxed LCA's, Explorer Intake, 65mm T-body, 'Stang Cam, 'Stang Air tube, K&N, GT-40X Heads, 1" Spacer, 1 5/8 BBK's, 2.5" Pypes X-pipe w/high flow cats, Single Chamber Thunderbolts, B&M 'vertor, Po-lice Swaybars.

    91 Mercury Grand Marquis Colony Park Station Wagon. K-Code, 4.10's, Repacked Trac Loc, MK VII LSC Engine, 'Stang Upper Intake, Stang Air Tube, K&N, 65 mm T-Body, 'Stang Headers, 'Stang Cat Pipe,'Stang Torque Convertor, 2 Chamber Thunderbolts.

  20. #180
    P31 Pursuit Car Brown_Muscle's Avatar
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    Quote Originally Posted by AngryMcMuffin View Post
    Honestly, I just want it to be a bit more responsive. I know I won't see the difference I did on a Chevy smallblock in a '72 C10 when I went from a 2bbl to a 4bbl carb and 2.25 inch true dual exhaust. But, anything would be nice until I delegate it as the car to be taken apart. Right now that's a '77 Plymouth Volare with a (mostly) built 318 in it.

    I did plugs and wires on it last night, autolite plugs so maybe they'd been changed before, but the plug wires said 1987 on them, so they were on it when the car rolled out of the factory for sure. That made it more responsive immediately.
    I'd recommend the HO upper intake and throttle body as well. It'll be a tad more responsive, but the biggest thing (in my experience), is that you'll gain some top end power that was never there before.
    -Phil



    +1982 Ford LTD-S Police Car. 351w, GT40 Heads, Edelbrock 1906 Carb, Full exhaust headers to tails. 3.27 Trac-Lok Rear. Aluminum Police Driveshaft. Speedway Springs+Bilstein Shocks, Intermediate Brakes, Baumann Shift kit.

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