Been down this road with the Butler prepped E-Heads. Difference in cost between letting them inspect and assemble ‘unported’ heads with better valves and dual springs vs the cost of what they call their ‘290 cfm’ D-ports just isn’t worth saving. If you are paying them to inspect and assemble the heads with good stainless valves and dual springs for your cam selection, then toss the comparatively small amt of extra $$ and just get their ‘290’ heads. The exhaust port on the box-stock Eddy D-port is surprisingly stingy at 160. After porting to their ‘290’ level, my Butler prepped Eddy D-ports flowed 300/210.
Agree 1,000% on the suggestion to stay away from the std ‘Performer’ intake. Been there, done that. Far better potential and performance with a well-prepped stock intake. Or go RPM and drop the comparatively small amt on a drop base kit for your shaker or air cleaner base.
Virtually all negative reports on the Comp 276 roller cam are in regard to its use in 455s and 460+ stroker builds. Seat timing is pretty stingy for the .050 numbers. Buts it’s like likely much better suited to a 406. Butler’s 230/236 grind on a 112* LSA would be great in your E-headed 406 where the same cam on a 110* LSA would be on the small and tight side of things for a larger displacement build.
Very eager to hear how this build turns out!
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