gt40 port sizes ? who knows ?


Founding Member
May 30, 2000
St Clair Shores MI
there are at least 5 different gt40 lowers now, anyone know the port sizes? i'm not asking for guesses, i want real answers and part numbers are a plus

and thats just for the 302.. i think there are 2 diff lowers for the 351

im curious how much smaller explorer intake ports are compared to real 40's or cobra's
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The GT40 family of intakes have the part number that ends in "-BA" or "-AA". The AA lowers have a little more runner exit section - good tip for 100% stock classes if you don't want to cheat. The BA is .96"x1.65" and the AA is ~1.00" x 1.80"
here is a look at them...................


  • BA vs AA Lower.jpg.jpg
    BA vs AA Lower.jpg.jpg
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