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LS Rectangle Port Cylinder Head to Cathedral Intake Adapters

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Rectangle Port Cylinder Head to Cathedral Port Intake

*** Some intake manifolds will require modification of alignment pin to sit flush on adapters***

Can ONLY be used with LS rectangle port cylinder heads Will not fit raised port LS7 cylinder heads
  • Compatible with ANY rectangle port head and bolts to ANY cathedral port intake manifold, supercharger or blower
  • Package Includes: 2 adapter plates (1/2" thick) with 8 O-ring seals
  • Made in Wichita, Kansas from aerospace grade, USA produced, billet aluminum
Intake manifold bolt lengths required when used with
  1. Factory GM LSA supercharger (M6 x 70mm) use ICT part # 551400
  2. Car intake manifold (M6 x 130mm) use ICT part # BOLTM6-130X10
  3. Truck intake manifold (M6 x 90mm) use ICT part # BOLTM6-90X10
See our other listing for reverse adapters You will use the factory intake manifold gaskets.

More Information

Manufacturer Part Number 551317
UPC 656729843178
Weight 3.250000
ICT Manufacturer ICT Billet
United States United States
Length Inches 4
Width Inches 17
Height Inches 1

WARNING - This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to


ALUMINUM: Most of the aluminum alloys used today contain some level of lead, usually less than .1%. Lead is known to the state of California to cause cancer and reproductive harm. Most aluminum alloys are physiologically inert in their solid form, and the lead is contained within, however user-generated dust and/or fumes may pose a hazard if inhaled or ingested. Heating beyond a certain temperature may also provide avenues for exposure.


STEEL (steel bolts):  Steel is an iron alloy with several metals including Nickel and Chromium. Both Nickel and Chromium are known to the State of California to cause cancer and reproductive harm, respectfully. This warning applies to stainless steels as well.