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I replaced my Vortec heads with a set of Sportsmen II's on my 377 it made a definate inprovement On my 468 I run Merlin's they seem pretty good of course they should be for the money you spend on them
Way too many variables to compare each head against all that is offered but they are nice pieces and have really thick decks.
I have seen some nice truck application motors built with WP heads and each had very good results .