North American Turbocoupe Organization

head help
bigep74 Offline
Junior Member
UGGGH I just got back from my machine shop and my head is trashed off of my 1987 thunderbird turbo coupe. apparently whoever built the engine used a jegs head or one that has been reworked several times and it is a mess. Does anyone know if a head from a 1982 2.3 ltr non turbo engine work ?

Thunder_Chicken Offline
Junior Member
From what I've gathered, the compression ratio is different between the two heads, and with the non-turbo head's higher compression ratio, it can cause knocking under boost. Hope this helps.

86 XR7 5spd Offline
Senior Member
pretty sure the CR difference is all in the pistons, but
having said that, I don't know the definitive answer ..
so I'm subscribing !

was recently thinking of picking up a 'spare' head (& intake manifold, already have a 'spare' E6 exh mani) to port & mod,
so when the time comes I can just swap that on and minimize my car's downtime..
David T
T5 / ported E3 / .63 / 35# / K&N
2.5" exhaust w/ cherry bomb
30+ mpg! 8.2 0-60, 16.4@88 1/4 (gTech)

Jeff K Offline
Look for a "D9" head from a late 70s / early 80s Fairmont, etc. they have the turbo chamber design and oval port intake runners. As a plus, they are often in good rebuildable condition as they havent been beat on. Be sure to use the Inconel turbo exhaust valves from your current head. I have been running one of these heads for many years.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

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