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Mac 351w longtube headers hit floor board

6319 Views 32 Replies 7 Participants Last post by  408foureye
I mocked up my drivetrain and found the pass side collector hitting the floor board. Driver side looks fine. When I measure the collector height from the ground, the pass side sits up 1" higher, which is causing the floor board interference. The headers are 1 3/4 Mac longtubes on a 351w with convertible mounts. I also bolted up the headers with the engine block and heads on the stand - the collectors are still uneven by the same amount. Anyone else have this issue?
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I had a similar issue with BBK 1-7/8 long tubes. I had to fiddle with the motor mounts on the K member to make them work. Pain in the you know what... It was the passenger side that was the problem for me too.
You could always do a floorboard massage. I recall having to do a little beating.
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