Posted by Gary in CO [64.234.252.216] on Thursday, December 26, 2013 at 15:38:19 :
In Reply to: 318 poly exhaust manifold posted by BK in Redmond [199.68.207.27] on Tuesday, December 24, 2013 at 21:17:43 :
Currently the best intake for low end torque is the stock 4bbl manifold. I have a Weiand 7503 on my 64 TWPW. The stock is a 180° and the Weiand is an open plenum, so better for high rpms.
The 7503 brings the torque band up past 3000rpms which is OK for me, as I will need torque there for towing in the mountains.
Hold off a while as a new intake for polys is in the works. It will be designed around a Hot Heads Hemi manifold and will have a 180° plenum.
I don't think the DTA headers will fit a 58 due to the the frame curving in at the engine. There are flanges and kits available to make shorty headers.
The image is of an available Hot Heads manifold, but it would require a home made valley cover like the old Hemis and Polys.
Gar
Fwd:
Thank you Steve for your kind e-mail. I am just the “cheerleader” and am glad to have a front row seat while all of this unfolds. The manifold project is a concerted effort that should produce a fine intake for us “Polyheads.”
I spent all day yesterday in LA with Javier Vasquez of Foundry Works working out the details needed for the proper manifold design to work on stock Polys as well as “built” Polys. We figured out how we want to run the water passages and still maintain the “Air Gap” feature. I delivered a Poly block, heads, Hot Heads HEMI intake, and 2bbl. Poly intake for design/measurement purposes yesterday.
We are thinking the manifold exit ports should nearly match the stock intake gasket but just a bit smaller to allow direct bolt-on to unported Poly heads. The intake runners will be properly tapered and the end port areas thick enough for port-matching to the Poly intake gaskets and then-some for the “Performance” oriented owners and those intending to install high flow ported Poly heads.
The carb pad angle will be scaled back from 4deg. to match the Poly at approx. 1deg. of angle to allow for proper carb float level while cruising...the plenum volume will be modified after Javier does his calculations; NOTE: Javier Vasquez is not just a guy who casts the aluminum HEMI and other brand blocks/heads for racing...,” he is a degreed Engineer, design-hand for Arias heads & works with Donovan Engineering, personally trained in head porting by Bob Mondello (he gave me lots of valuable porting info. and other Hot-Rod Performance gems during the visit!)...just to name a few of his attributes. Because of his experience, Javier is able to take our ideas/needs and bridge the gaps between the Hot Heads HEMI manifold and transform it into a New Air Gap Poly manifold; not a light task as proper velocity and pressure considerations are vital to a well-designed intake manifold that can be at home on the street or at the track.
I am also talking to Comp Cams for billet round lobe roller cores and cam suppliers for a cast iron cores...exciting stuff! The array of performance equipment is overflowing; New Air Gap 4bbl. Poly intakes from Chrysler Power/CPPA, high flowing Stage I & II iron heads from Gregg Hekimian Racing Engines (he is talking to me about building 300+CFM Poly heads and a 700HP Poly race engine...), Toth Engineering with his package of ported heads, other Killer custom Poly intake manifolds in the wings (hint- the LS platform of manifolds are a direct center to center match to the Poly), as well as sheet-metal Tunnel Rams and other custom sheet metal intakes available...we will have all the parts we need to embarrass the “big boys” if we so desire.
What is really cool about these new parts is they satisfy the bone-stock Poly engine owner all the way to the power-crazy Poly owners (there are a few of us) and everyone in between; there are performance parts to meet all of our budget considerations as I see it.
Ok...long-winded email but it is a great time to own a Poly engine.
Gary P.
The New Poly Air Gap manifold is will be a direct bolt-on; cast in valley pan/water crossover port w/outlet...
Yes, we will have injector bosses cast into the New Poly manifold. A Supercharger will work with this high flowing Poly intake as we are building sufficient runner length and cross-sectional area to flow approx. 315CFM – 270CFM to accommodate High Flowing cast CNC ported Poly heads we have. Additionally, I am working with an engineer to create a set of HP Poly Aluminum heads should we have sufficient orders and success from our New Poly Air Gap intake introduction.
The prototype HP Poly aluminum head with be totally redesigned for sufficient flow characteristics to sustain 600HP+ with thicker port walls to allow for increased porting of MAX Racing venues, redesigned water jackets will provide the added wall thickness to alleviate the “whoops – I ported through it” as well as increased bowl thickness, redesigned dual quench chambers, spark plug relocation...so I hope all the “Polyheads” out there and new enthusiasts will become energized to make all these projects reality.
Gary Pavlovich
You are not dreaming, I have to pinch myself sometimes as well. No, Edelbrock was not interested when we called them so we did a lot of footwork and visited two foundries in LA to settle on Foundry Works Inc. They designed & cast the original Bob Walker HEMI manifold from which we patterned our New Poly Air Gap 4bbl. (with Bob’s permission and blessings – nice guy!). This foundry is not just a bunch of guys pouring and making molds; Javier is a lifelong Mopar guy (his company car is a 1969 Super Bee) and engineer. He also developed and cast the Arias aluminum HEMI heads and has worked with and for some big name racers in R&D. His expertise at building the "proper” intake manifold by considering the required cross-sectional/taper and runner volume to produce the appropriate intake manifold CFM flow (310-270CFM) for our engines (proper plenum/runner pressure throughout the manifold is also critical) made him the sensible/right choice for this project.
Secondly, upon subsequent phone conversations, he is excited (truly – only a guy with a Mopar heart can get past the “business” end of things...) to cast a set of High Perfomance Poly aluminum heads for us! Of course we need to sell enough intakes to pay for the sizeable cost of that project before we consider casting New High Performance aluminum Poly heads.
I guess the bottom line is if we can generate enough pre-orders to pay for the Air Gap manifold project then we (or I...somehow) will launch the High Performance aluminum Poly heads project. Many of us have been “talking” about an aluminum Poly manifold for some time and now the “time” has come. Roland Osbourne of Chrysler Power Magazine is on the hook for this adventure and I am doing what I can to make sure this manifold project comes to fruition – lots of hours but then again, I work for free. I don’t see the Poly Air Gap 4bbl. manifold project as some entrepreneurial deal but merely offering a cost-effective alternative to the overpriced E-bay Weiand and to provide a truly superior intake design for all of us “Polyheads.” Our “better half” may not see it this way, but the joy is in the journey and the fruit of our labor will be smoke pouring from the wheelwells.
Gary Pavlovich
Follow Ups: