I acquired these heads a couple years ago. I purchased a car that was basically disassembled with many new engine parts. These heads along with appropriate felpro head gaskets came with the car. I don't know who did them. The heads have never been installed. They have new seals, valve springs, are big valve, ported, combustion chambers smoothed, and O-ring grooved. A friend who looked at them was negative on the O-ring idea and suggested that they could be used with stock head gaskets such as Felpros and that should work fine. Is this the way to go, or not? Another thing I noticed is that there are holes bored on the intake side of the heads. What is the purpose of them? The hole in the heat riser section seems enlarged, and there is also a hole bored next to the heat riser area. I'd really appreciate any and all input on these heads. TIA
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