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  1. #51
    FEP Member Mgino757's Avatar
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    That's what I'll be doing because I love my factory valve covers.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  2. #52
    FEP Member Mgino757's Avatar
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    Well, this project never came to fruition. Still have the stock engine with tired heads. I did just pick up a set of 4 bar GT40P heads that I'll recondition and build on. I paid all of a whopping $50! I plan to have them milled .010-.020", port the exhaust ports, throw a good set of springs on them (Alex's Parts). I will be changing the camshaft too. Power goal is 265-300 hp. A buddy of mine wants me to run a B303 cam, I'm not 100% sold on that idea. I don't like how his runs with it, his car has ported and shaved GT40's and B cam. It runs good, but it doesn't really come alive until just shy 3,000 rpm. I want a cam that'll provide a little more low end grunt since I have 3.55's and being a heavier convertible. I'm willing to spend up to $350 on a camshaft. I was eyeballing either the TFS stage 1, Comp 281HR, or Comp 270HR.

    I'm open to feedback.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  3. #53
    Moderator wraithracing's Avatar
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    Here is what you want and need.

    http://www.flowtechinduction.com/fti...ord-austemper/

    A custom spec'ed camshaft will make you more power and better drive-ability than any off the shelf camshaft. Worth every penny and will absolutely blow your buddy's Alphabet camshaft away.
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Ongoing RestoModification
    1984 SVO Awaiting Restoration
    1986 GT Wrecked by PO, but still want to save!

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Underway
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  4. #54
    FEP Senior Member OX1's Avatar
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    Quote Originally Posted by Ourobos View Post
    The twisted wedge will give you the most PTV clearance options, and can get you to those levels with a mild cam and decent intake.
    Yup. I have 170's on my 86, true flat tops with stock cam and 1.7 rollers.
    So an 85 should be fine.
    86 Capri, 5.0, 5Spd, A9L QH/BE, 47 lb Inj PMAS 3" MAF, Single T44 Turbo, Front Mount IC, TW170,
    Stock Cam, Explr Intake/TB, 1.7 Rockers, CF dual friction clutch, 3" DP, 2.5" full Exh, 3.27, 11.932 @ 115.78
    84 LTD, 331-10:1, TW170/Exprl Intake, 47 lbs inj/80 mm LMAF, Full Duals, Quarterhorse, Vortech 7PSI, Lentech AOD, 5 lug Mk VII brakes/rear, Eibach Sway bars, Cobra HB (dads ride, but I fix it )

  5. #55
    FEP Member Mgino757's Avatar
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    Another set of heads I have my eye on is the newer Ford X2 Street Cruiser heads, just in case I decide to ditch the GT40P's. Any insight on that bit of info?
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  6. #56
    FEP Member Mgino757's Avatar
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    I think for headers, I'm going to take the plunge and step up to long tubes. I'f I'm going to spend $400+ on a set of shorties, I may as well go full tilt and get more for my money. I can run them while I get ready for the head swap.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  7. #57

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    I bought the BBK "least offensive" shorties for my GT40P heads. Hope to have them on in a month. If you can wait that long...haha...I can tell you how they work.

  8. #58
    FEP Member Mgino757's Avatar
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    Quote Originally Posted by Str8sixfan View Post
    I bought the BBK "least offensive" shorties for my GT40P heads. Hope to have them on in a month. If you can wait that long...haha...I can tell you how they work.
    No Problem there. I am definitely interested in seeing how those fit for you. That could literally save me a few hundred. It's a shame GT40p headers are so expensive now. $420 for a set of shorties is flippin ridiculous. They used to be about the same cost as regular shorties. MAC knows they have the monopoly on them now. Of course now, any used sets are seemingly impossible to find.

    Would these work? The collector seems to have the correct primary tube arrangement for GT40P fitment.
    https://www.summitracing.com/parts/s...1004/overview/
    Last edited by Mgino757; 07-21-2019 at 10:27 PM.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  9. #59

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    Those headers look like the same headers you can get for sixty bucks all day on Ebay, I have a set on my 86 coupe with 88 drivetrain. They worked and fit fine, but are a little thin in the steel tube. I don't see how they'd work on Ps as the tubes swell outward from the port flange, intruding into where the spark plug sits on p heads.

  10. #60
    FEP Member Mgino757's Avatar
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    Would it be worth the cost and effort for me to switch to long tubes on an otherwise mild combination? Despite the exhaust obstacles, minor at best, I still like the appeal to running these heads. After all, I can say they're "stock Ford heads" lol. Plus it's what I've got.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  11. #61
    FEP Member Mgino757's Avatar
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    How much difference would long tubes make over a set of shorties on a mild setup like I have in mind?
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  12. #62
    Moderator wraithracing's Avatar
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    Quote Originally Posted by Mgino757 View Post
    How much difference would long tubes make over a set of shorties on a mild setup like I have in mind?
    With long tubes you might lose some bottom end torque depending on your combination. Overall power will most likely be the same with a possible small increase at the top end. Nothing wrong with long tubes compared to shorties, the issue for you is more $$ and any of the downsides to long tubes. Long tubes often have less ground clearance than the shorty setup. Depending on the flange on the long tubes you can have exhaust leak issues. What if any modifications/changes might be required to stay emissions legal is another. Long tubes can also adversely affect hot start issues because of additional heat near the starter motor. Starter motor removal/install can be more of a pain due to clearance issues. Same for install and removal of headers and the engine can be more difficult with long tubes compared to shorties. If you already have a good H/X pipe and you go to long tubes you will either have to modify yours or buy a new H/X pipe make sure to factor that into your overall costs too. Good luck!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Ongoing RestoModification
    1984 SVO Awaiting Restoration
    1986 GT Wrecked by PO, but still want to save!

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Underway
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  13. #63
    FEP Member Mgino757's Avatar
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    Sounds like I'm sticking with shorties then. This car does mostly cruising and the occasional trip to the 1/4 mile track and back.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  14. #64
    FEP Member Mgino757's Avatar
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    Well, header problem is solved. Scored a set of Ford Racing shorties. Room for days for the spark plugs.

    Now I just have to decide on a cam. It has also been suggested that I run an E303 cam. A friend of mine said he ran the E cam on his tbird before switching to a custom camshaft, supposedly he saw no difference at all between the two. The primary purpose of this car is to be a cruiser that occasionally goes to the track. I want to shift by 6000-6200 rpm. I also want good torque in the 2000-3000 range. I'm thinking a cam with maybe 218-225 @.050 duration, up to .535" lift, and 110-112 lobe separation angle.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  15. #65
    FEP Member Mgino757's Avatar
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    Started porting the GT40P's today. I put almost two hours into one of the exhaust ports today. I was being very careful trying not to get carried away.
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    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

  16. #66
    FEP Super Member xctasy's Avatar
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    Nice.GT40p's are good quality with those mods.If you can do it yourself well, they make excellent power on a carb car with a good intake. The best thing is they match the old Cleveland 2Vs unmodified; cfm is not compromised at high lifts.

  17. #67
    FEP Member Mgino757's Avatar
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    One of my exhaust ports, finished. There are 3 others like it, still have 1 to go. I have about 6 hours total in this head so far.
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    I've made the short side radius as smooth and gradual as I could. The walls have been smoothed, but I tried my best not to take much material away so port velocity doesn't suffer. I only cleaned the floor, but didn't take any material away. I did most of my work on the port roof and the area around the valve guides. I also smoothed any sharp ridges in the bowl area. I also smoothed the area behind the guide to have it match the roof radius as best as I could, being careful not to hit water.
    Last edited by Mgino757; 08-27-2019 at 11:40 PM.
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 2003 V6 T5, Ford Racing 10.5" clutch.

    1998 Mustang GT auto. PI swapped. Daily beater

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