Of course, what hasn’t been mentioned here is....... for the novice “DIY’er”, the 346/902/452 heads are easier to get into the 260cfm range.
Primarily because the SSR is much flatter and easier to rework.
Most of the 906/915 home reworked heads that suffered from lackluster higher lift flow is almost always because of a poor form on the SSR.
And those heads are pretty fussy about what the right shape is.
This spring I went thru a set of previously reworked 906’s.
Done at a shop with a flow bench and a dyno.
Bowls were opened up a bit more than I would have for std size valves, but almost nothing done to the SSR.
Peak flow of
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