I have Scott Cook heads and dual plane intake on my 393cuin in my Pantera. I wanted ~550hp at 6,700rpm and got 626hp @ 6,700rpm and 556 lb-ft @ 4,900rpm, so maybe my engine builder / cam tech underestimated the potential of this package. :-)
11.2:1 comp ratio with 93 octane and no ping, custom Comp Cams solid roller cam, 250 & 258 duration @050. It idles pretty nice and I still run vacuum brakes. This engine for me worked out great, not a stump puller but then my Pantera is not a truck, it is easy to drive at low revs, 18mpg and comes alive when you stomp on it, just how I wanted it.
My heads had 58.5cc and Kuntz & co used Mahle 275030F03 pistons and I think he machined them slightly to get to his target cr.
I used Yella Terra YT6321 roller rocker arms so no pushrod guide plates.
The Scott Cook heads and intake certainly look and worked out great. I can even run a 4" tall filter under the stock Pantera engine cover.
I did have some CHI heads which rubbed against the pushrods even after cutting the guide plates, the "pushrod holes" needed grinding, not impressed.
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