440 and 400 exhaust matching

Barbotte

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Will be putting my 73 bird together hopefully this summer. Originally came with a 400 but the project came with a running 440. Going to install the 440 so I can get it running while I rebuild a 400 that I recently got. Will be running HP exhaust and original pipes. So question of the day, is the 440 exhaust system the same as the 400.
 

69hemibeep

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The 440 is 3/4" taller so it depends on how much play you have in the pipes
 

Barbotte

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This is the Magnaflow 19304 Exhaust Pipe 2.5 ". According to their spec sheet, it's good for the BB and RB. The rest of the system should not be a problem. I would of thought that this would be slightly different for each application.
 

69hemibeep

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No, you might have to loosen a few things up to get it to seat then retighten the system or it may fall into place. That usually is not the case for me LOL
 

Barbotte

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Thanks 69hemibeep. One last question, was it a true dual exhaust system or did they have a crossover pipe.
Thanks in advance.
 
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