NEW! KATANA Port Plates for LT1/LT4 Engines

TooHighPsi's new 'Patent Pending' KATANA Plates have been completely re-designed and are the thinnest port plates available for your GM LT1/LT4 Gen V application. KATANA Plates have been engineered to minimize the amount of vertical height increase of the supercharger or intake manifold allowing for easier installation, with more available hood and cowl clearance for improved bolt access. 

At only 13.5mm (0.532") thick, our extremely thin KATANA Plates raise the supercharger/manifold vertically only 15.8mm or (0.630"), providing an extra 4mm (0.17") clearance compared to any other plates on the market while also providing an additional 20% weight saving. The KATANA plates utilize an improved port design, resulting in a smoother transition from intake/SC to the cylinder heads and one fuel rail now includes three -8 ORB connections for better fitment on Camaro and CTSV applications.

Vehicle Fitment: KATANA Plates are a direct bolt on for stock LT4 supercharger vehicle applications, plus the LT4 CTSV and LT1 Camaro SS with a Magnuson 2650 with no other modification required.  When used on C7 Z06 Corvette and ZL1 Camaro with a Magnuson 2650, our Billet 2650 supercharger lid is required to provide adequate hood clearance, or the hood needs to be modified for fitment.  NOTE: The Camaro/CTSV valve cover oil fill extension need to be removed.

Valve Cover Requirements: Our KATANA Plates are designed to work with stock GM valve covers, with coil packs relocated using the optional brackets (not required if using Magnuson's coil relocation kit).  They also work seamlessly with the THP 2-pc LTx Billet Valve Covers. If you have aftermarket valve covers, please call us to verify fitment. 

Injector Type:  Magnuson 2650’s requires the use of LS1-style 60mm "LONG" injectors that have coil connectors at the top of the injector.  Stock 1740’s and other blower /intake manifold brands can use the LS1-style long injectors or LS3 “short” injectors with a top or bottom hat.

All kits include 2 sets of plates, brackets, billet fuel rails with your choice of -6AN or -8AN end fittings, O-ring gaskets and correct length hardware to install under your supercharger or manifold (injectors not included). Options include coil relocation brackets, LT4 PCV spacer connector for under supercharger, 

Please call or email us with questions about your specific application!

These parts are sold for ground-vehicle use in a controlled environment.

Proudly Engineered and Manufactured in the USA!