Hello All
Since I am not a "summit racing" junkie I looked up their
Tech Support number and spoke to "Terry". I asked if
he had a chart from any maker showing the bennies of
their product at differant RPM's. He said this is no
longer done by the makers and the buyer should first
buy the product and then have their vehicle dyno tested.
So, I found this. It has been a year since MoPar
Muscle Magazine published a articule on this subject
that was then linked to this site.
For the story they used what is advertised as a "300 HP"
Crate LA-360. This engine has a cam spec'd at 0.385
Intake Duration and 0.410 Exhaust Duration ( which is
not very good for a truck driving at speeds up to 80
MPH on the Hwy's ). They also used a 750 CFM Carb.
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This "test" was done with the engine on a stand, not at the
rear wheels as you drive your vehicle.
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For test one they used the LA-273/318 OEM Exh Manifolds
that were used up to the end of the 1974 production year. This
did not impress me from a articule on HP from a "Muscle Magazine"
since the 360 heads are designed/build better at the Exh Ports
and they used the restricting manifolds on their testing.
The numbers showed 311 HP at 4,600 RPM's.
Test @2 was with a set of 1975 and newer OEM Smog Spec'd
Exh Manifolds. These manifolds matched the Exh Ports and
showed 314 HP and 407 lbs of Torque.
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This could make one think what would it show if they had
used a set of 1972 - 1974 360 Exh Manifolds on the 360 Heads.
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Here is the Chart from MoPar Muscle on using the 360 Engine.
http://www.moparmusclemagazine.com/tech ... to_17.html
Since the average/normal driver stays under the posted RPM's
of MoPar Muscles Testing, I wonder what such low RPM
readings would show at 2200 RPM's while driving at a part
throttle ( with out a 750 CFM Carb ).
Every thing stated above also is the same
like knowledge
with the front distributor engines.
Rodger & Gabby
COS
Rodger & Gabby Colo Spgs 47 De Soto S-11, Loaded 62 Imperial Crown Cpe w/62 Lic Plates, 63 Le Baron w/63 Lic Plates, 66 Le Baron, 70 W100 SWB Loaded Custom, 70 Overlander-Internatioal Dbl, 77 D Shorty 2 x 4, 360,NP, 12 bolt