Its oil getting past your rings..some HP Race motors are built loose and could possible have some minor blow by....thats why a vaccum pump is highly recommended/required..
if you do not have $600.00 to invest in a vaccum pump..at least install some e-vac tubes in the headers
hard to tell by internet how bad your blow-by is...so i am just making a general statement here..
but its oil getting thru
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "