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Thread: What effects can I expect from swapping a Mustang HO intake with the stock T-Bird.

  1. #21
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    Quote Originally Posted by 87tbird_org_owner View Post
    From what I've found about fox body cars you're very fortunate to still have a level car.
    Nah. It's fine. Subframe connectors and it's golden. Been beating on my car for years and it's still level.
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

  2. #22
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    Quote Originally Posted by TheFoeYouKnow View Post
    You've got WAY too much exhaust for those heads, that cam, and 14# injectors. You're probably giving up power having such large piping. A Mark VII 2" H-pipe would probably make more power with your combo, especially at low RPM.
    What??? Maybe 3-4Hp??

    Always go big so you have room to grow...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  3. #23
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    If a person was in some kind of spec racing class I can see where tuning the exhaust to the motor makes 100% sense but in this case with the future mods he is going to make then the 2-1/2" exhaust is money well spent. My 331 wants more exhaust than the 2-1/2 but with the torque arm and panhard bar that is all its going to see.

  4. #24
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    Default Update on changing stock upper intake manifold to H.O. manifold.

    Since the bottom portion of both intake manifolds are the same the H.O. Manifold bolted right on with no problems. Added the H.O. Throttle Body and EGR Spacer and then just switched over the Non H.O. TPS, Idle Control Solenoid and EGR. Made a little adjustments on the TPS position and base idle screw and engine runs fine. No surging or off idle stumble. All this may of been a wasted effort because I don't notice any more HP even with 1.7 ratio Rocker Arms. I've got shorty headers and the H.O. Mustang Cat forward exhaust I could install but that probably won't add any HP either. For any real HP gains I guess I'll have to open the engine up and put in a different Cam and Heads that have a higher compression ratio. 150 stock HP just doesn't cut it on the road anymore. It's okay in the city and it gets great MPG on the highway. Can still get 30 Highway MPG after 31 years. Just have to be careful when passing other cars.

  5. #25
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    If you are going to open up the engine then just convert to mass air. Watch the 1.7:1 rockers with a cam swap and the pistons as you may not have the reliefs in your pistons like the Mustang HO motors.

    Funny thing is when I put long tube headers and a full dual exhaust on the stock throttle body 302 in my '83 is made a huge difference. Have you done a leak down test on the motor to see if you have good compression on all cylinders? Could also be that any additional power you are gaining is just blowing through the converter on the trans. My just be a time in the river thing after 31 years.

  6. #26
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    I thought a few guys had used 1.7s with stock HO spec cams (like 87-93 Mustangs)with no issues? I could be mistaken. What was the difference on the 93 Cobra cam spec? Didn’t they have 1.7s? Sorry to derail the thread...
    87 Tbird LX w/Factory floor shifter 3G upgrade. Tinted Windows...85 Mustang GT steering wheel(non-cruise) 17'' Saleen SC style wheels,Front/Rear TC sway bars/poly bushings & Mustang GT steering rack...'05 Mustang V6 springs...93 Cobra MC & booster, MM adjustable C/C plates, Work In Progress....... ( On The Shelf---HO computer, 19lb injectors, HO cam, BBK headers, Explorer Intake, Cold Air Intake ,Phantom Gauges, Stinger stainless exhaust pipes )

  7. #27
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    93-95 cobra did have 1.7's, but they were also mass air.
    Quote Originally Posted by jcassity
    I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
    Hooligans!
    1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
    1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
    1986 cougar.
    lilsammywasapunkrocker@yahoo.com

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