New manifold update

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

To: glpavlovich@xxxxxxx

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