Many years ago on one of my small blocks ( don't remember which one I have had 7 ) While it was on the dyno we did a manifold test : I had a gasket matched Strip Dominator we switched to an out of the box Victor and it picked up 13 h.p. using one of my 750 hp double pumpers. ( picture is my current W2 head 410 on the dyno a few mounts ago )
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