|For more information
about the use of adapter flanges
Thickness: Although our headers are normally built on
5/16" header flanges, we also offer you the option of special
ordering flanges in 3/8" for an additional charge of $25 per pair.
Thickness: All of our headers are normally made using mild steel tubing.
We have made small production runs of stainless and find it not cost
effective. Most headers are made from 18 gauge (.049"
wall thickness) however some 4 cylinders are made using 16 gauge
Welding Methods: All tube
to tube joints are gas acetylene welded. The advantage is the
annealing process that gas acetylene produces as opposed to TIG
welding which causes very high stresses and results in premature
tubing failure unless properly annealed. We gas acetylene
braze the tubes to the flange on the outside, and some headers such
as road race or oval track are MIG welded on the inside. Again
the gas acetylene has an annealing quality and the brazed area
produces a large fillet which really spreads out the loads
involved. We have seen oval track headers last for 10 years
and drag race headers last for 25 years using these procedures.
Serial Numbers: Stahl headers
has serial numbered every header since January 1, 1966. We
still have those records. Of course since a human recorded
them, it is possible the information is not 100% correct.
However, these records do allow us to look up certain
information. For most of the past 10 years we have recorded
the cylinder heads the headers were built to fit. With so many
after market cylinder heads having unique port locations, size,
shape, spark plug location and angles, it becomes a virtual
nightmare. Why the cylinder head manufactures appear to lack
consideration for the end user is one of the mysteries in our life.
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