Cylinder head dyno shoot out

No one asked, but I’ll offer up my .02 anyway….

I’d use some off the shelf “affordable” forged piston that put the compression in the 10.-10.5cr range with a 65cc head(I wouldn’t argue against flat tops).
Shoot for “0” deck, and then whatever the CR ends up with the various heads, “iiwii”.

I’d test all the Ede/SM variants as the first phase, then move on to the “others”.
This would allow the valvetrain to be reused for all of the heads in phase one.

Personally, I don’t see the point in testing more than one set of “unported ootb” SM variants.
Use the ones from SM in true ootb form, then a set with the seats done and a quick bowl blend…….then whatever else tickles your fancy.
I do think it would be “interesting” to see how truly “ootb” Ede’s would compare to truly “ootb” SM’s……..I just don’t know that it’s worth doing that test to find out.
I guess you couldn’t really answer that question until the results were in.
If one was significantly better, it’s worth it. If they’re about the same, probably not.

Cam in the mid/hi-250’s, low .600’s lift, 108 lsa, 1.5 rockers.
Something that should easily make 550hp with the ported heads and a reworked single plane for a hot street/strip type build.

I believe the HS made Mancini rockers will fit any of those heads without any spring interference issues.

It’s going to need at least 1-3/4” headers(and 1-7/8” would be better) to not have them be holding back the better heads.