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Thread: Gt 40p heads

  1. #1

    Default Gt 40p heads

    Will a set of gt 40p heads bolt on directly to a stock bottom end 1982 gt with out any modification

  2. #2
    FEP Super Member bwguardian's Avatar
    Join Date
    Jul 2010
    Houston (Clear Lake), Texas


    Yes, but you'll want headers that allow good access to the spark plugs...and you'll want to upgrade the weak valve springs...
    '82 GT monochromatic (red) cloth

    '85 GT vert two tone (white on charcoal)...white leather
    '00 F350 two tone (white on silver)...gray cloth
    '00 Excursion Limited two tone (white on tan)...tan leather...wifes ride
    '08 Taurus Limited ice blue...tan leather...daughter ride
    '08 Edge Limited white sand tri-coat metallic...tan leather...other daughters ride

  3. #3
    FEP Power Member richpet's Avatar
    Join Date
    Mar 2003
    Lowell, Oregon


    Yes, but the P-heads do have their quirks. As bwguardian mentioned the plugs. I *think you need P-specific headers? Or is it a swap to 90* plug boots instead of the 120*?
    Never used them.
    83 5.0 GT. Quicker than it looks! 10:1 (or just over) 306, Motorsport a332 cam, 140A alt, t5 conv, 8.8 w/ 3.27's, Edel rpm, alum rad, very worked e7's, Holley SA carb, etc... SOLD IT!!!!

    Now an 1981 Granada! 9.5:1 .040 over 302, Edel E-street heads, 268 cam, T5, 8.8 with 3.55, plus all the stiffening goodies, all control arms, lowered, alum shaft, x-pipe with Outlaws, FiTech FI system...

    "Never underestimate the power of stupid people in large groups"

  4. #4


    Somebody recently posted some stuff saying it wasn't so hard to find gtp headers these days. Great heads though.
    1984.5 G.T.350 5.0 CFI AOD Convertible (TRX package, loaded)
    K&N filter in a stock dual snorkel, GT40 heads, Edelbrock 3721 intake, MSD 8456 Dist., MSD 8227 coil
    Comp cams XE254H, hypereutectic pistons
    Hooker Super Comp Shorty Equal Length Headers, catted BBK H-pipe, full custom duals
    Maximum Motorsports caster/camber plates and strut tower brace, 3.73 rear.
    Ford Performance Springs, Firehawk A/S 225/55r16 on LMR TRX r390 wheels (street)
    Federal 595 rs-rr 245/40r17 and 255/40r17 on OE cobra r wheels (race)
    AOD rebuilt with a 6 clutch direct drum, Koline steels stacked with 8 clutches, Kevlar band, superior shift kit, new torque converter. --Everything else stock and fully functional.

  5. #5


    $90 shorty headers work fine on my " P " heads... You will need a specialty spark plug socket though... I found one on Trick Flows website ( I think it was for LS engines) that works well......

  6. #6


    I’ve been gathering parts over winter and these are next for the 83. Can someone tell me
    How much are p heads and headers worth? In hp terms, stock flat tappet cam,old performer intake, avs2.
    The parts can be had on eBay for about 375 or so. Not locally at all for me.
    Ideally an explorer motor but that’s if it pops up for sale but not likely soon. I’m looking to get 300hp when It’s done and said. Not a race car just a fun daily.

  7. #7
    FEP Power Member gmatt's Avatar
    Join Date
    Jul 2009
    Chicago, south subs


    I've always heard they're worth about 30hp give or take over E7s. Mostly from improved flow and slightly higher compression ratio. Probably should upgrade the valve springs.

  8. #8


    300hp shouldn't be too difficult with 'P' heads.

    My 98' Explorer motor is roughly 325hp/375tq with 170k miles, stock untouched heads and stock HO cam. Great weekend cruiser setup. Bulletproof and cheap.

    1986 Mustang GT 5spd
    1998 Explorer Limited 5.0AWD (Wife's Ride)
    1999 Ranger Ex-Cab 3.0 5spd (My Winter Beater)

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