SBC intake manifold test

grumpyvette

Administrator
Staff member
in the Sept 2008 Chevy high performance magazine they did an intake/cam test,
on a sbc 383 with 10.5:1 cpr and brodix IK200cc heads and a couple of comp cams solid roller cams and a 750cfm Holley carb, keep in mind the single plane intakes used a more radical cam than the dual planes were tested with, and the engine combo they used is unlikely to match your,s so the results on your combo are sure to differ, but its still rather interesting to see the differences an intake makes
keep in mind that the cam used and the heads being used, and the headers ability to scavenge the cylinders all effect the intakes flow potential
, BTW they DID test the EDELBROCK DUAL PLANE intake with the larger cam, that the single planes were tested with and and the EDELBROCK single plane with the smaller cam the dual planes were tested with
Chevy high performance mags sbc intake test

READ THIS LINK
viewtopic.php?f=55&t=4362

viewtopic.php?f=52&t=5537&p=16744#p16744

Dual planes
BRAND ………….....Torque…….rpm……hp…….rpm
Brodix-hv1016…....471………3900……437...…5500
Dart.42811000…...482………3900……434…...5400
Edelbrock
Rpm air gap..7501..485………3900……441…..5600
BIG CAM test...........494......4200.....509....6200
Professional prod
Crosswind………….....482…….3800…….430…5500
Summit-226010……487……3800……..430…5800
Weiand 8501………...489……3800……..433….5600
Chevy z28
/327/365hp intake….465……3800………417…5600

Single planes
BRAND ………...........Torque…….rpm……hp…….rpm
Brodix hv1011..........472…………5100….492……6200
Dart..42411000.........479…………5100…512…….6400
Edelbrock
vic jr..2975……...........477………….5100…500…….6100
EDELBROCK
SMALL CAM................466………….3800…448…….5600
edelbrock
super vic……...............479…………..4900….507…….6400
GM performance
10051102……..............484………….5200…..515……6300
HOLLEY KD
300-110………..............478………….5100…..509……6300
Pro..prod
Hurricane……...............478………….4900….509……6200
Weiand
team G……….................478………….5200…..507……6100
world prod……..............483………….5000…...512…..6300

NOTICE HOW THE LARGE CAM DUAL PLANE, COMBO DID VERY WELL

the super vic , and keith darton SBC intakes have always worked better than the vic jr in my opinion on cars designed for a good single plane intake, the bad rap usually results from the guys installing a single plane intake on engines that don,t need or can use the flow characteristics of a decent single plane intake.
keep in mind almost all single plane intakes, are designed to be used on an engine with the following
MINIMUM REQUIREMENTS, to use the intakes flow rates and designed power band

Duration_v_RPM-Range_wIntakeManifold01.jpg

a minimum of about 10.5:1 static cpr
a minimum of about a 245cfm port flow rate on the cylinder heads, at .500 lift
a minimum of about a 245 degree @.050 duration cam
a rear gear in the 3.73:1-5.13:1 ratio range
a manual transmission or auto with a 3000rpm minimum stall converter speed
a engine thats rarely run at under 3500rpm and usually sees 6500rpm PLUS, in its intended power band
(usually solid lifters help here)

in most cases if you fail to meet two or more of those minimums your usually better off with a quality dual plane intake, like the edelbrock RPM air gap or WIEAND AIR STRIKE
keep in mind its not just peak hp but increasing the average hp/torque with in your operational rpm band that matters
 
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