North American Turbocoupe Organization



head help
bigep74 Offline
Junior Member
#1
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 ?
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Thunder_Chicken Offline
Junior Member
#2
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.
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86 XR7 5spd Offline
Senior Member
#3
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)
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Jeff K Offline
Administrator
#4
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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