Re: cast iron exhaust manifolds
Thanks for that link Jon - I'm not sure yet how important casting numbers are for that series...an excerpt from their rules -
4.01 Cast iron exhaust manifolds are mandatory and must be correct, have correct casting numbers and be of correct material. Under no circumstances will headers be allowed, including those cars that had headers delivered in the trunk.
Internal modifications are OK. Correct appearing exhaust manifold paint or coatings are OK. Casting date codes are not looked at and are not part of the tech process. Headers are allowed for a first time racer. One time only. Once the racer decides to be part of the series a game plan must be set by the Racer to be in compliance to respected set rules.
4.02 Even if equipped from the factory with cut-outs, all runs must be made with closed exhaust running through the mufflers.
4.03 Exhaust systems may be upgraded to a maximum of 2.5" diameter head and tail pipes.
Exception: Certain Max Wedge cars left the factory with 3" inch head pipes, these cars can retain these head pipes up to, but not past, the transmission tail-shaft. Even if equipped from the factory with cut-outs, all runs must be made with closed exhaust running through the mufflers.
4.04 Mufflers must be stock looking in design (Welded mufflers not encouraged). Maximum muffler inlet and outlet is 2.5”.
4.05 Exhaust pipes must exit in the correct original location.
4.06 Excessive exhaust leaks are not allowed.
4.07 "X" and "H" pipes are allowed. The “X” pipe assembly can not exceed 24” in length.
1967 El Camino (White)
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1965 El Camino (Sold that junk)