Chris Cobb at DynoTune put in some major effort so it worth a post to show some interesting results. Chris did a dyno test of different SBC manifolds, most ported and an as-cast Pro-Filer/Wilson. I as well as Eric Weigartner offered manifolds and a local to Chris ported up a 2970 as well.
AFR 220 CNC
259/263 108 LSA
.626/.626 gross lift
Edelbrock 2892 by Weingartner (sweep 6)
Pro-Filer ASCAST (sweep 12)
Edelbrock 2970 by local porter (sweep 15)
Motown 4150 by Weingartner (sweep 18)
Holley 300-110 w/SRH plenum mod (sweep 21)
Holley 300-25 by SRH with BURR (sweep 25)
Edelbrock 2925 w/SRH plenum Mod (sweep 27)
Eric did a 2892 for me 4 years ago porting the toilet and primer plus plate also. Very happy with the results.
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