Does anyone know of any aftermarket head manufacturers that build 4.0 HO heads other than Hesco? I've tried Google, but didn't come up with anything. Thanks.
I think Hesco is it. I heard Clifford was looking into it, but nothing on that of late. Accurate Power does large valve conversions on the 4.0. Still, thats not a new head. What are you trying to accomplish? A good Port and polish and some other stuff will add plenty of power to the 4.0.
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