16 ENGINEBUILDERmag.com | AUGUST 2020
the SBC, which Torrecarian says even reigns
supreme in their lineup. “SBC still reigns king
when it comes to overall volume, followed by
the SBF. en they are followed up by our LS
and BBC lines. But we are always working on
and exploring new heads or even re ning our
current lineup. We have a new head that is close
to release, which will ll a void in our product
o ering.”
According to Torrecarian, the one trait
that separates their CNC cylinder heads from
other o erings in the marketplace is their
performance and ow. “It has been this way
since the beginning. Many times our heads will
out ow any comparable alternative in the same
runner volume. In some cases, you have to take
a competitor’s head that is a step or two larger in
intake runner volume to match our performance
and ow.We also spoke to Bob Williams of All-Pro
Cylinder Heads between rain delays at the
NMRA/NMCA event in St. Louis. We asked
him about the market from his perspective.
Williams says that their heads are designed
primarily for racing purposes, but some people
will run them on the street occasionally. “I’m
not saying that you can’t run our stu on the
street because some of it you can, and some
people do, but that’s not really our marketplace.
ose are usually more tame motors from
500-700 horsepower. Our market caters to the
exotic high-end packages, whether it’s a turbo,
supercharger, nitrous, whatever – we’ve got
packages for all of that.”
Williams says there are a few di erences
between their naturally aspirated heads and
those designed for power adders. “ ere is quite
a bit of di erence in what some of the engineCYLINDER HEADS
Airfl ow depends on valve lift, valve area and air densi . Using a fl ow bench can help
you understand these values, but keep in mind that these values can vary from one
fl ow bench to another, depending on the methodology and equipment used.
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14-18 eb.aug20 Cylinder Heads.indd 16 8/7/20 9:44 AM
Naresh Jariwala