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64 kiwi boni's 1964 Bonneville

2023 February
of the Month

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1981 firebird engine swap fitment problems with a he headers


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I have a 81 firebird formula that was an old drag car with lots of upgrades but I won’t go into that right now. It had a 454 in it before I bought it but they took it out so I have another 454 in since it was already set up for it but my problem is the headers I have bind and won’t let motor go in unless I take them off. Does anyone know what headers I need to use? 

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I would think that any header for a BBC for a 2nd-gen Camaro or 68-72 Chevelle would fit your application. Also you can clearance your headers somewhat. I say that assuming that the motor mounts for the BBC were put in the correct place to begin with.

 

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Jordon, i would look for a set of shorty headers, and you certainly cant fit the 454 with them on, you will need to drop the motor in then install your hearders .

i went through 3 sets of long headers on my 72 camaro and was having ground clearance issues ( to the point my mates where calling me sparky, as i was always bottoming them out!! )

now i have the shortys on, i have no issues with fitment and ground clearance and i am running 2 1/2 inch x pipe system off them  ! 👍

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I don’t know if it’s true but I heard shortys don’t make as much power and air flow as long tube.but if that’s the only ones that fit I got to do it lol 

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An episode of Engine Masters on Motortrend benchmarks stock exhaust manifolds between midlength and long tube headers. It is episode #15 of Engine Masters. You might be able to find it on YouTube.

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