I smell antifreeze

I can smell antifreeze while my 99 GMC Sierra 6L is running. Does anyone know if the intake gaskets on these motors leaks like the do in all the 60 degree V6 motors. I would hope intake before a head gasket.
Thanks in advance.

I can smell antifreeze while my 99 GMC Sierra 6L is running. Does anyone know if the intake gaskets on these motors leaks like the do in all the 60 degree V6 motors. I would hope intake before a head gasket.
Thanks in advance.

I would say that is definitely the problem. I just did the intake gaskets on my 98 5.7 Sierra.