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I am going to add the ported 3500 plenum to the store here as soon as I take a couple pictures. As some of you know, the stock 3500 plenum underflows a stock 3400 plenum. We are aware of the power increase with even the stock plenum so that should help explain that there is more to power than just flow. Flow is good to know though, and I have now scanned in the flowsheet showing stock 3500 plenum on a stock 3400 head and a stock 3400 lower intake vs the same setup but with a ported 3500 plenum.
My port work is a gasket match, and then going back over the ports and bellmouthing it on the inside to smooth the transition area. I am going to charge $50 for port work on this plenum since it has no runner length that needs to be worked on as well. I highly recommend the ported 3500 plenum swap for flow, noticable (and soon to be dyno proven) results, larger TB capacity without the needs for extra porting, and cost.
Guess you want the flow specs
I will have more soon with the ported lower intake and ported 3400 plenum comparison. All comparisons are of like parts to show my work, not what GM did to upgrade their castings over the years.
My port work is a gasket match, and then going back over the ports and bellmouthing it on the inside to smooth the transition area. I am going to charge $50 for port work on this plenum since it has no runner length that needs to be worked on as well. I highly recommend the ported 3500 plenum swap for flow, noticable (and soon to be dyno proven) results, larger TB capacity without the needs for extra porting, and cost.
Guess you want the flow specs
I will have more soon with the ported lower intake and ported 3400 plenum comparison. All comparisons are of like parts to show my work, not what GM did to upgrade their castings over the years.
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