[/quote]

You're comparing a newly designed, fully CNC ported head with a stage 2 ported head that was designed over 20 years ago.
I would hope at least "some" progress has been made in that time.

You're also comparing flow numbers gleaned from different sources.
Those should never be considered truly "apples to apples".

The SR's start out advertised as 261cc.
At MW size, stage 2 ported, they are probably still only 270-275cc.

Fully CNC ported from Indy the SR's are 295cc, and are bigger than that from some other porting services.

A little refresher for Indy heads:

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/1168215/1/indy-bb-head-data.html [/quote]

Thank you Dwayne for all the information you share with us.