Current Shim Levels for OS C-SPEC and C-SPEC PS

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Current Shim Levels for OS C-SPEC and C-SPEC PS

Engines and Mufflers Having problems or need advice on Engines or Mufflers?

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04-29-2004, 12:08 PM	#1 (permalink)
WillJames Registered User My HF Map location Join Date: Mar 2004	Current Shim Levels for OS C-SPEC and C-SPEC PS Hi Everybody, The general consensus from GOBS of testing the Viper Head with the SX-H, C-SPEC & C-SPEC PS by Shannon, Clint and others and confirmed by James O'Neals indicates that especially on hot days to run CP or Magnum 30% Fuel you generally need .024 in shims to control detonation. The stock Head C-SPEC and the HYPER Head on the PS need an extra .004 to a few more for optimum running on 30% CP or Magnum. The testing has been done using CP and Magnum 30% because that is what we can get easily around here and plus we were all sitting on a few cases of one or the other. I have been told that other fuels in 30% would burn approx the same, but testing is advised I have no idea. Shim your heads people. It takes 20 minutes to pull the average motor and add the shims. You will LOVE the results. Please let us know in this forum if you find the same or different results. __________________ William James Crazy wife still trying to kill me.

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