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Hi, I am currently running ported 40P heads (500 hydro cams, JWT sptings, Ferrea retainders/keepers, Ferrea valve seals, brass valce guides) in my 1991 TT. The engine is coming apart within the next week of so, and I was wondering if the unobtainable 48P heads would be an upgrade to my ported 40P heads or just a waste of my money and time? Any input is welcome. Thank you. AK.
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