trans am 1981

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Thread: trans am 1981

  1. #1
    Walking
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    Post trans am 1981

    Hi, i have a pontiac trans am from 81 whit a 301 engine non turbo.
    I want to now if i can change the engine whit a 455.Wil it fitt?
    sorry if i am writing a bitt wrong,i am from belgium:-)

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    7.0 Liter LS7 V8
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    Re: trans am 1981

    There are other more knowledgeable people here that can chime in, but yes any Pontiac V8 should fit. The 301 is a low-deck version of other Pontiac V8s and the 400 and 455 (same external dimensions) were offered in earlier years of your car. The Olds 403 was also offered, as were smallblock Chevy's, so they can also be swapped in using factory parts. But there is something right about a Pontiac 455-powered Trans Am! You might find some further details at www.highperformancepontiac.com.

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    6.2 Liter LS9 Supercharged V8 MrCritical's Avatar
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    Re: trans am 1981

    It will be necessary to change the transmission, and probably the differential as well as other components as well. Check the emissions laws in your country as well before proceeding. Best of luck to you.

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    2.8 Liter Turbocharged V6 funkypunnk's Avatar
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    Re: trans am 1981

    Yes, and I have done it myself. You will probably want to change the tranny. Since the 455 is a torque monster you should put a TH400 behind it. You also need to either change the connecting rods or keep it under 5500 RPM if you want it to last. Remember that any parts from a 350 or 400 or 428 Pontiac engine all fit the 455. The 301 and 265 were anomalies and an effort by Pontiac to lighten and clean up the emissions of their V8s, it didn't work which is why they stopped making Pontiac V8s soon after. You could put a 200R4 or 7004R behind it but they would have to be strengthened up to handle the 400+ ft.Lbs of torque the 455 can dish out.
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