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I had a stock gasket cut by R & d in Cali, it was a POS. You couldn't have paid me to put it on my car. It looked like whatever they used to cut it was snagging the material and causing small rips in the edges and raise sections. I have a cometic now. My buddy just had to pull his head and copper spray his cometic because it was leaking(it was a brand new motor too). We will see if mine holds up.