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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 1
Ported heads
290/.492”adv. 234@.050” 110LC Hyd.
Cam
2.02/1.60” valves
Weiand single four – single plain manifold
Tri-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 1
Ported heads – same flow as 402 heads
Same cam profile
1.94/1.60" valves
1957 Cast Iron Dual Quad w/500cfm Edelbrocks – single
plane manifold
Same headers
vs.
396” Poly Stroker (3.97”bore x 4.0”Stroke)
10 to 1
Ported heads – same flow as 402” heads
284/.480” adv. 224@.050” 110LC Hyd.
Poly Cam
2.02/1.60” valves
Cast Iron OEM single four intake - dual plane w/750Holley
dbl. pmpr. or 500cfm Edelbrock – same power
Same Headers
vs.
392” Poly Stroker (3.948”x 4.0”Stroke)
9.8 to 1
Ported heads
284/.435” adv. 224@.050” Hyd. Poly Cam
2.02/1.60” valves
Edelbrock P600 Three Deuce Intake – dual plane
Headers
The 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 1
Brodix Aluminum Heads
not ported
218/228@.050” 108LC Comp Cams Hyd. Roller
Cam
2.02/1.60” valves
Edelbrock RPM manifold – 600cfm Edelbrock carb
4 into 1 Headers 1 5/8”
vs.
360LA Mopar (4.0”bore x 3.58”Stroke)
10 to 1
Edelbrock Aluminum Heads
not ported
308/318 adv. .510”lift 234/244@.050”
112LC Hyd. Edelbrock Cam
2.02/1.60” valves
Edelbrock 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 Pavlovich
From: Michael Gionfriddo
Sent: Sunday, December 18, 2011 11:18 AM
Subject: [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 __._,_.___
MARKETPLACE
. __,_._,___
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