Ported 3400 Upper Intake

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Product Information

We offer 2 stages of porting, each with its own level of modification.  All of our manifolds are cleaned, baked, blasted, and inspected for cracks and warpage.  Stage 1 uses the stock large port 3100/3400 intake gaskets as a template.  Stage 2 uses the larger 3500 intake gasket, or the stock 3400 gaskets can be modified for the larger port.  Where our work differs from other companies is based on flowbench research.  We only use the gasket port sizes as a limit to porting, not a template to be matched.  Gasket matching improves the flow compared to stock, but will be outperformed by our higher flowing designs. 

Sportsman series upper intakes are sized where we want them and then blended to the stock runner/plenum area.  Competition series are fully ported into the plenum area and the bell shaped opening inside is matched as well for the most flow possible from this intake manifold.  

We use paper 3400 upper gaskets or metal 3500 gaskets for our ported upper intake.

Powdercoating is available in many colors.  If you have a cracked manifold and would like for us to weld it up, please contact us for pricing.  Our porting does not increase the chance of cracking.  We recommend following our torque procedure to reduce the risk for any upper intake, stock or ported.

Product CodeWOT3400UIM

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