Yes like i said spark plug leak,by plug leak i mean spark plug leak. I have a set of champion gn1 heads,and i had i thought was a header leak from my new ta headers.After pulling header off and check gasket,and reinstall noise still there. So further investigation it is from the spark plug. There are helicoils looks to be in all of the plug areas. I tried just a simple gasket seal off another non tappered plug,just to see if noise went away and it did. So now question is what is a gasket seal plug = to a r44ts plug with a 5/8 head. I already tried a 11/16 gasket style plug will not fit. Anybody ever have this problem or got another solutin!!!!