test
heads use stock merc gasgets and are complete with the dumps attached already.
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i heard from reliable sources those heads dont have cooling jacket capacity,hence a meltdown waiting to happen
these have them you can visiably see them.
they have them,but they are real ineficient at transferring heat.compare them to mercs drag or hi perf heads
I love mine, I've never had a heating issue....
Also have a set on a 2.4 BP, love'em.....