Nope... not going to use these again.

Put on 74 GMC truck with a 350 in it. I had high hopes for these. Didn't tighten them too tight or too loose and even used the extended clamp thingys. And a few days later saw oil pooling under my truck. So off they came again and I RTV'd them onto the covers and put 'em back on the other day. I am kicking myself, shoulda just bought the cheap squishy FelPro ones and been good for another 10 years. The material is not soft, barely left an impression on the gasket, so I don't see how these would really seal all that well on the rougher cast iron edge of the head. Maybe they work better on machined surfaces and smooth aluminum covers, but they don't on older style engines. with sheet metal covers. And this is the first time I have ever had covers leak after replacing seals.

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