With all the discussion about the various Gen 3 intakes, I thought I’d do some bench testing of some of the different manifolds available. Some results were predictable and others were not. First I tested one of our Stage 2, 6.0l CNC ported intake ports with a radius flow plate to establish a baseline. Next I tested a rectangular radius flow plate that blocked off the triangular intake roof entrance. The rectangular plate approximates the size and location of the manifold’s runner match up at the head. In total I tested 5 intake manifolds. I didn’t have a FAST to test, but if I get the opportunity, I’ll test and post the results.

Lift______.100__.200__.300__.350__.400__.450__.500 __.550__.600__.650
Port only__71.4_149.5_213.7_233.5_251.7_271.2_286.5_303 .1_280.6_286.5
Rect.Plate_70.3_149.4_206.5_226.9_244.3_259.2_272. 2_275.7_274.6_278.8
Truck Int._70.3_143.9_194.4_209.8_220.5_229.2_234.2_237. 7_243.1_248.5
SSR90mm_70.3_145.0_190.0_205.0_215.9_226.3_238.3_2 48.4_253.0_256.2
LS1 Int.___70.2_142.6_189.1_203.2_216.5_226.9_235.3_23 8.1_238.1_237.4
LS6 Int.___70.2_144.4_200.0_215.8_227.6_238.1_244.9_25 0.2_256.0_263.0
VictorJr.___71.4_147.7_205.7_224.7_240.2_254.7_268 .5_264.2_263.0_275.8

The test was performed on a JKM600 Flow bench. I tested what would be the number 3 cylinder on each intake (one of the two center ports). There were no throttle bodies used in any of the tests. All ports were capped to force air to flow through the manifolds. My sources tell me that the 5.3l and 6.0l truck intakes are identical. If anyone can confirm this I'd appreciate it.

Some comments and observations…… I wasn’t too surprised to see the LS6 and Edelbrock intakes do better than the truck and LS1. I was surprised to see the SSR do as well as it did because it looks like a 90mm throttle body flange was grafted onto a standard truck intake. What can we learn from this test? These tests can help us evaluate each intake runners flow capacity. In other words, how restrictive they are. I suppose I should test each and every runner, but I haven't got the time for that. This test cannot tell us how the intake performs in entirety. That’s up to the dyno or race track. I certainly believe the truck intake becomes a flow restriction in the higher rpm ranges especially on more highly tuned applications. The truck’s dual chamber design can produce excellent low end torque similar to a dual plane carb intake, but sacrifice top end performance while the LS6 provides better mid range and top end but not quite like the Victor Jr..

Please feel free to add any comments or suggestions.

Richard

 

All I can say is WOW! Great info!
to Richard

 

Awesome Data Richard! Thanks for all the effort!

Looks like the Victor Jr rules at all lift points, very impressive, is this the carb manifold?

 

Damb that is some good info. Thanks for going throught all the trouble to get that done.

 

Ya I belive it is

 

Thanks for the info Richard

 

Id love to see that edelbrock with a flying toilet setup, I think it would perform well

http://www.ronsfuel.com/flying_toilet.cfm

 

I guess I'm suprised to see the truck intake flowing better than an LS1 unit.

 

I wonder what the numbers look like when comparing the flow from individual cylinders like comparing #3 to #7 with the truck intake

 

Nice man that's awesome data! All on the same flow bench done by the same dude. That's data you can't argue with. I wonder how much the Victor Jr. can actually flow? All the other manifold's flow tapered except for the Jr.

I don't know if this has been discussed before, but will the 90mm LS2 SSR intake fit on our trucks?