STREET HIGH PERFORMANCE
NEW CAM (No Exchange Necessary.)
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 FEATURE.)
BEST STREET PERFORMANCE INTAKE CAM
(NEW -- No Exchange Necessary)
Street High Performance upgrade for all Weber cars ('82-'89 USA
SPIDERS WITH BOSCH EFI MUST DO WITHOUT VVT.). Our #424 11mm cams
are similar to the factory AUTODELTA 11mm 1750/2000
performance profile with the modified opening profile
for good lowend torque and idle. Midrange and top end
are superb with no flat spot. Duration 254 degrees @ .050"
lift. Base circle diameter 1.030," Standard 1.075.
THERE ARE TWO SETUP COMBINATIONS: Mid-range will be about
the same with both setups.
BASIC SETUP -- A pair of these SA424 cams. as intake and
exhaust, will be aggressive enough to be strong up to 7500 RPM,
with great top end for track events and still be docile enough for
street. Our street performance 2.0 10.5:1
COMPRESSION test engine made 171 HP with very good
low end torque and idle.
ULTIMATE STREET SETUPS: Enhance top end for those track
days by using this SA424. as exhaust with #445 intake. Sorry no
dyno test results for increase.
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.
- Bolt in with no clearance issues with any
- To minimize lobe interference with follower bores with
high lift performance cams, the base circle
is undercut to 1.030."
All new cams should be installed with new
followers. There is risk of damage with old
followers. We can only guarantee our cams when
installed with new set of Spruell Motorsport