STREET HIGH PERFORMANCE
NEW CAM (No Exchange
All of our street/performance cams are
daily driver friendly with gentle opening ramps for good idle and
transition with no lag or flat spots. Our custom designs have
progressively more top end. (82-89 USA
SPIDERS WITH BOSCH EFI MUST DO WITHOUT VVT
This #445 12.0mm lift cam is the tried and true
very successful Jim K JK303 design.
Installed as INTAKE CAM
with 11.0mm SA424 EXHAUST CAM, the broad
smooth power band makes it very popular for street performance, as
well as rally and vintage racers. This combination is
renowned for both remarkable low end torque and top
end. Duration @.050" 266 degrees. Base
circle diameter 1.030," Standard 1.075.
PORTING: Cleaning up the
bowls from valve seats to back guides is quite sufficient for
street performane cams without enlarging the runners.
Full porting is marginaly appropriate for street unless you
plan to do track days. Enlarging the ports enhances gain from
midrange up and pays handsomely above 7000 rpm.
VALVES: Enlarging the window
into the chambers with our 1mm oversize valves is equally
valuable and lets cams have full affect for both street performance
HEADERS: Cam and porting do
make a big difference on their own, but these enhancements will
only reach their full potential with our Spruell
Motorsport free flow headers.
- Our race cams have super durable lobes that are first
hardwelded before precision regrinding.
- To minimize lobe interference with follower bores with
high lift performance cams, the base circle
is undercut to 1.030."
- We strongly recommend upgrading to VSS12-1 springs for
11.6 and 12mm lift cams.
CAMSHAFT EXCHANGE CORES REQUIRED
- Sorry, but we are no longer able to fill customer
camshaft orders without exchange cams in hand. Even after we
upped the core charge from $50.00 to $75.00, very few cam cores
were returned -- no exceptions. VERY IMPORTANT:
Read about core return conditions in "Additional Product
Information" on the menu.
All new cams should be installed with new
followers. We can only guarantee our cams
when installed with new set of Spruell Motorsport