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About ICT Billet
ICT Billet was born from a passion for LS swaps. After tackling our first swap in 2001, we saw the need for better parts and reliable information. In 2014, we launched ICT Billet to provide high-quality, American-made parts that simplify and enhance LS and LT swaps.
We’re dedicated to supporting car enthusiasts with precision-engineered products, detailed installation guides, and world-class service. Thank you for choosing ICT Billet—your partner in making exceptional builds a reality.
ICT Billet LS1 Cathedral Port Cylinder Head to LS3 LSA ZL1 CTS-V Supercharger Adapters Rectangle LSX 551316
Cathedral Port Cylinder Head to Rectangle Port Intake Adapter
Cathedral Port Cylinder Head to Rectangle Port Intake Adapter Can ONLY be used with Cathedral Port Cylinder Heads Intake manifold bolt lengths required when used with Factory GM supercharger (M6 x 70mm) use ICT part # 551400 Car intake manifold (M6 x 130mm) use ICT part # BOLTM6-130X10 Truck intake manifold (M6 x 90mm) use ICT part # BOLTM6-90X10 See our other listing for reverse adapters
- Fits: ANY Cathedral Port Heads and will adapter to ANY rectangle port intakes, supercharger or blower.q
- Will not fit raised port LS7 intakes
- Package Includes: 2 adapter plates (1/2" thick) with 8 O-ring seals
- Made in Wichita, KS from 6061-T6, USA billet aluminum
Premium USA Produced Materials
Our parts are crafted from premium-grade materials, sourced and produced right here in the USA. Designed by experts in our state-of-the-art facility, we use cutting-edge American-made equipment to ensure unmatched quality and durability.
Exceptional Quality
At ICT Billet, quality is our standard. Every part we produce is crafted with precision using advanced manufacturing technologies in our USA facility. Our commitment to excellence ensures unmatched reliability and performance for your engine swap.
Innovation in Development
At ICT Billet, precision is key. Using advanced technology, we laser-scan vehicles to create solid models for perfect fitment every time. Our commitment to research and development ensures our products work seamlessly from the start.
Proudly American Made
Keeping jobs in America is our priority. We use USA-made materials, belt tensioners, metric flange bolts, pulleys, and more. Our focus on American manufacturing means reliable products you can trust.
Your Complete LS Swap Shop
From engine mounts to wiring, ICT Billet is your one-stop shop for LS swaps. We provide everything you need to make your swap smooth, efficient, and professional.
SEMA Proud, SEMA Strong
As a proud member of SEMA, we are part of an elite group of automotive manufacturers. Our dedication to quality and innovation sets us apart, delivering products you can depend on.
Jorgito
Reviewed in the United States on January 9, 2022
Todo se ve bien y de buena calidad pero todabia no las instalo.
Rick
Reviewed in the United States on March 11, 2021
Had to modify these to fit a stock ls3 manifold then had to trim the manifold to make them fit. It is a good product and everything ict I have gotten has been great. These just require a bit of timing and modification to work.
Chris Christian
Reviewed in the United States on July 28, 2020
Perfect fit and fast shipping!
michael gray
Reviewed in the United States on July 24, 2020
Loved this product did exactly what i needed it to do. Was able to put ls3 intake on 5.3 cathedral port heads
Nayquan Scott
Reviewed in the United States on July 17, 2020
This did work as needed to adapt a ls3 intake to a cathedral port head. But I have to order longer bolts from ICT billet
Michael Wiener
Reviewed in the United States on July 14, 2020
Excellent quality , Machine work is like everything else Ict billet offers . The port match could be better but nothing that can’t be cleaned up with a die grinder .
Koolbreez
Reviewed in the United States on December 31, 2020
I used these adaptor plates to put an LS3 Magnuson Supercharger on a set of LS2 243 heads. Initially it looks like things wont line up, but after you torque everything down it lines up perfectly, I verified the port alignment with a scope. Great value,
Customer
Reviewed in the United States on July 19, 2016
Very good item
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