Can you send me a link for head gaskets I should use with my 502 to prevent water leaks. I'm looking at fel-pro but I like cometics and their custom gaskets a friend of mines told me that head gaskets play a role in engine compression the smaller the thickness the higher the compression and the thicker it is the lower the compression. I know 502 came with one piston design and with my 110 cc heads the compression will be around 9.7.1 but with the gasket being .25 thick the compression should be around 10.1 or higher like 10.7.1 so ill still be able to run unleaded gas. Can you help me with wat arp kit I should use send me links they'll be so much appreciated part number s will be heaven sent...........thanks