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I have had a set of Sanderson block huggers on a 392 in a
300C chassis. As stated elsewhere, they did not initially clear. The
clearance problems were minor however and by heating up the right front tube and
putting about a 30% 'dent' in it clearance was obtained for the upper inner
control arm. On the other side it was motor mount clearance and it took a
similar dent on one tube to get them to clear. They DO clear the torsion
bars. Sanderson's header extension would be a good place to start your
exhaust system as it gives the quickest angle to the rear for ground clearance
and is properly laid out.
Now, I never got to run these headers on the car because I
found a set of the factory truck-style 4-bolt cast iron headers. In '57
even those will not clear the power steering box. That is why the 390 HP
300Cs were only offered as stick shift / manual steering cars. The
factory DID come up with a solution and created another 4-bolt cast with a
flattened area to be mounted on the left side head to clear the PS. In '58
the 300D was offered with a 2.5" exhaust system option. This package
included one each of the original style full round 4-bolt cast, and one of the
flat sided 4 bolt cast, plus 2.5" pipes all the way out.
The flat sided manifolds are EXTREMELY RARE.
One thing I did not try with the Sanderson's on the car is
wedging up the motor mounts. The 390HP Cs have such a part listed as among
the package equipment. I do know that with two of the round
4-bolt cast, and experimenting with wedging, clearance can be obtained. I
suspect the dents in the Sandersons could also be minimized.
The factory 4-bolt cast headers (truck style) are probably
close to the performance gain of using Sandersons although they do not look like
it. But hey, they were good enough for Carl Kiekhaefer' NASCAR Chrysler
300s and they are good enough for me.
Wayne Graefen
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