Is there enough material on the stock exh manifolds ports to open them up slightly? I, want to keep from buying headers....I'm thinking I, can take a little less then 1/8th of an inch all the way around both the exh. manifold ports and the exh. ports of the heads. Like to get a little more info. before venturing into this

Jeff..... P.s. thanks for all the help and support in the past :-)