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LX9 3500 Competition Series Upper Intake

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The stock 3500 manifolds are excellent in design, but are also restrictive from the factory. WOT-Tech manifolds are not just ported, but have been flow tested and dyno proven (without tuning to date). Below are the numbers for a stock set of heads/manifolds, with a WOT-Tech ported 3500 head and stock manifolds to show the difference between ported manifolds and non ported as the bottleneck that they represent to your engine.

Based on WOT-Tech Competition Series manifolds. CFM @ 28" 3.700" Bore

Lift (inch)	Stock Head and Manifolds	WOT-Tech Head Stock Manifolds	WOT-Tech Head and Manifolds
0.050	35.5	35.1	34.4
0.100	64.9	64.3	64.7
0.150	91.8	91.9	92.4
0.200	119.4	120.5	122.1
0.250	140.2	141.4	146.5
0.300	154.6	157.1	165.3
0.350	163.7	166.9	177.7
0.400	169.2	172.8	185.8
0.450	172.4	175.9	191.7
0.500	173.6	178.3	194.7
0.550	175.7	NA	196.8
0.600	177.1	NA	198.7

These number represent porting for the larger metal style gaskets (or blue ring paper gasket in the metal lower intake gasket felpro set).

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