I use the copper rtv on both sides of the gaskets.
install,torque,let cure 24 hrs before fire up.
been on the truck for 4 yrs now no leaks at the head gasket.
no lower gasket leaks due to ball & cone collectors.
will be installing my hedman 79250 headers on the 440 this weekend and will be doing it the same way I have done all my SB engines running headers.
Ijust read here someone else used the copper rtv on both sides of gasket and let cure before install. then install them and torque for crush/seal.
one thing for sure, the droplets I have seen squeezed into the flow of the exhaust port did NOT burn off in 7 yrs of use. it does not get any hotter than at the exhaust valve opening.
read about doing this here on moparts in the 90s and have sealed up many warped cheapo header flanges ever since.
how you liking the A-body headers of any brand for install?
A-bodys are tuff install but worth the effort for performance.
