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I guess you’d need to ask yourself………how much more power would the new heads have to make to justify their cost?
I have ported SR’s that flow in the 360 range.
Cnc345’s with a decent valve job(2.25” valve) and some minor blending are in the 380 range on my bench.
572-13’s will require pistons...
Not an EFI guy, so no guidance here.
But I do have a question…….. how will you be quantifying the improvements?
It’s interesting the comment about the EFI cam profile.
It’s not much different from a few I’ve used on higher hp carb applications……… and I don’t think it’s much different than DVW’s...
But……if the numbers were in the 220-230 range, would you still be worried about it?
I had some heads here not long ago that had been ported.
I had flowed the heads on my bench before they got shipped off to be ported.
The post porting numbers supplied by the porting service showed nice gains...
If someone showed up at my shop with a 906 head that needed-
All new guides
Hardened ex seats
Cleaning old parts
R&R expansion plugs
Assemble head and set spring heights
You’d spend around $500-550……it adds up fast...