text and photos Scott Cook
4V Heads, Dual Plane Med Height 4150 Carb Flange
I HAVE JUST FINISHED DESIGNING & CASTING A NEW INTAKE MANIFOLD TO SUIT 351C 4V, ITS EXTERNALLY THE SAME AS A CAST IRON DOAE- 9424-L MODEL FACTORY FITTED ON MUSTANGS , FAIRLANES, AUSTRALIA FALCON GT-HO’S ETC:.
IT WILL SUIT ALL 4V HEADS STOCK OR WITH TONGUE TYPE INSERTS, C.H.I ENGINE MASTERS 3V- 185 CC OR 218 CC PORTS. THIS MANIFOLD WAS DESIGNED FOR THE GUY THAT WANTS TO ADD PERFORMANCE TO THERE CAR BUT RETAIN FACTORY TYPE APPEARANCE. IT HAS A COMPLETE NEW RUNNER SYSTEM WITH HIGH VELOCITY MORE DIRECT APPROACH RUNNER DESIGN, APPROX 10mm TALLER THAN STOCK AT THE CARB PAD. I CURRENTLY HAVE THREE PROTO-TYPES FOR R&D, ONE
MANIFOLD HAS BEEN BACK TO BACK ENGINE DYNO’D WITH GOOD RESULTS ON A DEAD STOCK 351C 4V ENGINE, BACK TO BACK AGAINST PERFORMER 4V / ALLOY BUDDY BAR / STOCK CAST IRON.
IF YOU OR ANY OF YOUR FRIENDS ARE INTERESTED IN THIS TYPE OF MANIFOLD PLEASE FEEL FREE TO DROP ME A LINE, I CAN E-MAIL YOU SOME PICS & DYNO RESULTS AT YOUR REQUEST IF YOU WISH.
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is cast in aluminum, slightly taller (around 10 mm or a bit more than 3/8″)
with smaller ports that are sized more like a CHI 3V. Luckily the intake
was also designed to fit a 4V iron heads (port stuffed or not) so also
fits the A3 high port heads. Like the over-the-counter version of the
Boss 351 intake, it has two oval holes in the carb flange instead of the
four circular holes of the iron Ford intake. The one tested is one of
Scott’s first generation intakes which he has since redesigned to work
better on larger displacement engines with good flowing heads. Given that
it’s the earlier design, both Dave and I thought it might be out of its
element on my 403C but it surprised us. The dyno fuel log wouldn’t clear
without a spacer so it was run with a couple of different 1″ spacers,
making the best HP with HVH 4 hole spacer registering 569 HP @ 6350 RPM
and 511 ft-lbs @ 4750 RPM. Switching to a 1″ open spacer, increased peak
torque to 514 ft-lbs @ 4700 RPM but HP wasn’t quite as good. Pop the
mufflers off (or use the larger 3″ inlet/outlet Magnaflows) and it might
make 575 HP with a street hydraulic roller. Not too shabby.
Paint the A3 heads and Cook intake Ford blue and no one would know it’s not
a stocker. In fact, that set up would fit under the hood of my 1966 Mustang
fastback but would require notching the shock towers for high port header
clearance. The 225/60/15 tires would not be happy
Intakes to follow include a Roush B351 and CHI 3V single planes. On an earlier
test on the 351C dyno mule with CHI-3V heads, the very tall CHI intake picked up
20 HP over the low profile Cook dual plane. Will the trend continue?
Stay tuned (same battle time, same bat channel).