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  1. J

    Radiator Caps

    NASCAR teams often run 40 PSI caps, their seals, hoses, etc. are all excellent and replaced often. Every maximum PSI gained allows 2 degrees F higher temp before boiling. So, a 21 PSI cap, vs. a 40 PSI cap allows an additional 38 degrees F before boiling over.. (in theory) Mind you, they...
  2. J

    What are the red (or yellow) dots on the Mark IV's for?

    Anyone know what the yellow or red 4" diameter dots on the Mark IV's are for? Looks like a line-up mark for tire changers, but they are on the roof sometimes too. If you get a chance to email me the answer I'd appreciate it, I'm not on this site much til the spring when I get my RCR Mark IV...
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