Chances are they were getting ready for boost, lowering the compression by a head gasket will work but.... you change the angle of the burn from the spark plug and can cause hot spots in the pistons ect. Seen it a 100 times on a bunch of differnt cars. its the "budget" way of lowering compression. Will it work sure but not for ever and chances are your still goin to go through the bottomend sooner then later.