These phenolic plates keep the heat in the cylinder heads from soaking into the blower case or intake, leading to longer life for the blower and lower IATS!! We make these in cathedral to cathedral, and square port to square port, LS7, as well as the conversion plates from square to cathedral (those are listed under the "adapter plates" item and you can select phenolic from the drop down menu). 1" Versions can be modified for spray nozzles or nitrous fittings under "custom modifications". They also come in stock port size or .050" oversize for ported heads, please specify when ordering. Most combinations come with hardware (LSA, LS9, etc), but lengths may differ depending on application, contact us with any questions.
1/2" and 1/4" Plates are stocked in most common port configurations, 1" spacers are MADE TO ORDER and may take a while to get manufactured.
Great video from TwinTurbo Wen and Justin White Tuning HERE:
Note: We do NOT use gaskets in Phenolic materials. The head side is sealed with a small amount of RTV, and uses whatever gasket comes with the intake/supercharger on the top side. For a more in-depth explanation, please watch the video below: