Polyheads,
I received and e-mail query regarding the new Poly intake being cast and I
have copied and pasted my researched reply to help update us on the manifold
progress:
“David,
Thank you for your enquiry regarding the new Dual Plane Poly Wind Tunnel
intake manifold.
This design is a tuned port & plenum manifold; runners are long &
high and slope directly to the back of the intake valve for superior CFM flow,
runners are tapered for velocity of A/F charge to improve torque & HP,
manifold
plenum is enlarged to accommodate increased air/fuel on
demand w/o being detrimental to low-end power, designed to create pressure wave
to reduce any reversion (pollution of intake charge during cam overlap &
exhaust stroke), a Wind Tunnel design as opposed to mere air gap to dramatically
reduce heat sink and maintain a much cooler fuel charge...little to no chance
intake manifold vapor lock with the tall Wind Tunnel design. The design is a
true “dual-plane” that will promote enhance torque and HP output in a stock as
well as High Performance Poly engine.
The Poly Wind Tunnel manifold is approximately
6.5” tall from deck of block for a “no compromise” performance design with
adequate underhood clearance in 1962-66 passenger cars and trucks when equipped
with a drop base air cleaner assembly – the amount of drop base is dictated by
your carb choice, Holley or Edelbrock, electric choke or manual choke, water
neck outlet design...each application will vary somewhat and install help is
always available. If your 1967 truck has 13” underhood clearance from the deck
of the block to underside of your hood, then your clearance is sufficient;
generally all trucks have approx. 2-3” more underhood clearance than passenger
cars.
Acquired data:
OEM Poly 2bbl. intake w/Carter carb is 8 5/8”
tall from deck of block without air cleaner assembly (air cleaners were large
& tall).
OEM Poly 2bbl. intake height is 4 1/8” tall from
deck of block.
Weiand Poly 4bbl. alum. intake w/Holley or Carter
carb is 8” tall from deck of block...
Weiand Poly 4bbl. intake is 4 5/8” tall from deck
of block.
*Note: Michael Harding’s 1965 Plymouth w/Weiand
4bbl. intake, FAST EFI unit, and 2” spacer has proper underhood clearance
with drop base air cleaner assembly.
New Poly Wind Tunnel intake manifold with 4bbl.
Holley or Edelbrock carb is 9 1/2” to 9 3/4” tall without drop base air cleaner
assembly (7/8” drop base w/3” element is 3.1” tall, 1 3/8” drop base w/3”
element is approx. 2 3/4” tall...) which equate to only 7/8” to 1 1/8” taller
than OEM/stock Poly intake and 2bbl. carburetor.
New Poly Wind Tunnel
intake manifold is approx. 6.5” tall from deck of block without drop base
air cleaner assembly & 3” element.
The proper drop-base air cleaner will assure hood
& carburetor clearance in all stated applications. Other modifications may
involve a water neck outlet re-orientation, upper radiator hose swap, and all
performance manifold swaps require some kind of linkage extension or adjustment
for throttle & auto trans kickdown - if auto trans equipped – Lokar or
Bouchillon throttle cable and auto trans cable kits are highly recommended for
ease of operation & installation as well as longevity and a “clean” look ,
some applications benefit from a water neck outlet re-orientation depending on
type of radiator used. The Poly Wind Tunnel manifold retains the vacuum gauge
outlet in the rearward/OEM location. No interference issues with aftermarket or
OEM Mopar distributors.
In addition to the aforementioned Poly Wind
Tunnel intake manifold improvements over OEM and aftermarket Poly intakes the
following are noteworthy;
1) Heater hose outlet is moved to passenger side
for easier/cleaner hookup.
2) Temp sending unit orifice in driver side water
crossover port is deep enough to allow OEM or any aftermarket temp sending
unit/gauge hookup.
3) OEM water bypass hose fits properly without
kinking, unlike stock application, due to elevated water crossover ports &
waterneck outlet.
4) Electronic Fuel Injection bosses/or nitrous
bosses are cast at the base of each manifold runner.
5) Manifold is drilled for the Holley carb bolt
pattern which is also compatible with the Edelbrock carburetors that are drilled
for dual pattern applications – all Edelbrock carbs have the Holley bolt pattern
drilled into their base. A Carter Thermoquad can be used with an adapter – this
is my favorite carb and I will probably install a TQ for performance and mileage
testing.
6) Intake runners are thick-walled to allow for
“porting” and port-matching in all performance applications.
7) Aluminum design is an obvious weight savings
and heat dissipation advantage over the OEM cast iron manifolds.
8) No heat crossover port to crack manifold
plenum or reduce power during operation.
9) Ribbed plenum floor to mix air fuel charge and
promote better combustion.
The second manifold has been poured after casting
box adjustments and all is perfect as it should be. The next step underway;
creation of the final machining jigs to finish-machine the intake for trial
fitment as the last step in quality control; estimated timeframe is two weeks
for completion of jigs and fitment testing.
Let me know if I can answer any further questions
or be of help in any way.
Thank you,
Gary “
Sent: Monday, March 24, 2014 6:07 PM
Subject: Poly Manifold Hi. What can you tell me
about the new poly manifold? What are the carb options with it? I have a poly
318-3 in a 1967 Dodge Power Wagon WM300. Thanks.
David
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