Originally Posted by fast68plymouth
I’m not sure which combo the “543” is.

4.375 x 4.500 is 541.2
4.380 x 4.500 is 542.4
4.500 x 4.250 is 540.7
4.440 x 4.375 is 541.9


You know Dwayne, I never could figure out what a 472 crate hemi was either.

4.25 x 4.150 = 470.9

Did "471" sound too much like a Ford product? Not sure what the logic was there.

We will never know. But I do remember the part number was P5249666.
As in "mark of the beast" if you believe such things LOL

Rich H.

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