--Mick,Since dyno time is expensive, I have not compared the Weiand single plane vs. the OEM dual plane on the same engine; something I plan to to in the future - but I have built & dyno’d several engines with similar internals and here is some data to consider:402” Poly Stroker (4.0” bore x 4.0”Stroke)10 to 1Ported heads290/.492”adv. 234@.050” 110LC Hyd. Cam2.02/1.60” valvesWeiand single four – single plain manifoldTri-Y style headers 1 3/4” tubes into dual collectors - 2.5” & 3.5”vs.390” Poly Stroker (3.94”bore x 4.0” Stroke)9.5 to 1Ported heads – same flow as 402 headsSame cam profile1.94/1.60" valves1957 Cast Iron Dual Quad w/500cfm Edelbrocks – single plane manifoldSame headersvs.396” Poly Stroker (3.97”bore x 4.0”Stroke)10 to 1Ported heads – same flow as 402” heads284/.480” adv. 224@.050” 110LC Hyd. Poly Cam2.02/1.60” valvesCast Iron OEM single four intake - dual plane w/750Holley dbl. pmpr. or 500cfm Edelbrock – same powerSame Headersvs.392” Poly Stroker (3.948”x 4.0”Stroke)9.8 to 1Ported heads284/.435” adv. 224@.050” Hyd. Poly Cam2.02/1.60” valvesEdelbrock P600 Three Deuce Intake – dual planeHeadersThe dual plane cast iron four barrel OEM Poly intake performs well up to 5000rpm and then only slightly drops in HP according to your cam profile...it outperforms all single plane manifolds, both the single four barrel Weiand and Cast Iron dual quad intake, up to 3600RPM on both HP and Torque and it does it with ten degrees less at .050” (224@.050”) Cam vs. the 234@.050” Cam.The dual plane cast iron four barrel OEM Poly intake compares nicely with the dual plane Edelbrock P600 Three Deuce intake. The OEM four barrel surpasses the P600 in both HP & Torque up to 3800RPM and makes more peak torque than the P600.Additionally, the 396”Poly Stroker with 224@.050” Hyd. Cam and cast iron four barrel OEM intake outperformed a 383 Brodix headed/Roller Cammed Chevy Stroker motor on both HP & Torque up to 3500RPM!The Stroker Poly’s performance against a 360LA engine is impressive as well. The small cammed (224@.050”Hyd.) 396 Poly Stroker with cast iron four barrel OEM intake surpassed the Edelbrock RPM Airgap equipped LA360 to the tune of 58ft.lbs. more peak Torque. It also made more HP and Torque up to 3700RPM than the RPM Air Gap and exceeded the LA360 on torque alone up to 5000RPM; see the LA360 specs below the Chevy data.vs.383” Chevy Stroker (4.03”bore x 3.75”Stroke)10 to 1Brodix Aluminum Headsnot ported218/228@.050” 108LC Comp Cams Hyd. Roller Cam2.02/1.60” valvesEdelbrock RPM manifold – 600cfm Edelbrock carb4 into 1 Headers 1 5/8”vs.360LA Mopar (4.0”bore x 3.58”Stroke)10 to 1Edelbrock Aluminum Headsnot ported308/318 adv. .510”lift 234/244@.050” 112LC Hyd. Edelbrock Cam2.02/1.60” valvesEdelbrock RPM Air Gap manifold – Holley (unknown CFM)TTI Headers 4 into 1 1 5/8”A “ported” cast iron Poly four barrel intake (dual plane) promises to equal or surpass the RPM Air Gap and the single plane Weiand in both HP & Torque all the way to 6500RPM. I have a ported and highly modified OEM Poly four barrel that has yet to be tested...but will be proven on the next dyno session.Also take note that the larger cammed 234@.050” Poly 390-402” Poly Stroker motors outperformed the LA360 at all levels and came within 3HP and 19ft.lbs. of the “Peak” numbers of the 383 Chevy Hyd. Roller Cammed motor with all its “modern” equipment.Bottom line; the cast iron four barrel Poly intake is the best performing intake for a stock or mildly cammed Poly engine with a stock stroke and is more responsive under 3500RPM than a single plane manifold. It will perform well up to 5000rpm for street duty in both stock stroke and long-stroke (street-stroker) applications. The Weiand single plane and the dual quad single plane design is the best performing manifold with larger cammed engines or for Stroker Poly applications and performs best at 3500RPM and above.The aforementioned copious data substantiates why I say “if 425HP and 450Torque or less will satisfy/meet your needs, then build a Poly motor if that is what your Mopar came with.”Have a Blessed Christmas!Gary PavlovichFrom: Michael GionfriddoSent: Sunday, December 18, 2011 11:18 AMSubject: [318poly] Re: [FWDLK] MOPAR WIDE BLOCK 318 POLY WEIAND HIGH RISE 4 BARREL 7503
Gary,
With the Poly dyno testing you have done have you ever bolted on one of each of these intakes to see how they performed against one another with the same baseline engine?
Regards,
Mick
0410 479 197
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