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the bowl area

very impressive but nothing i would build for the street especially with 4450 lb car with 2.94 gears. ran those pistons years ago speed pro-trw heavy weight. also ran that cam years ago with 245* - 245* at .050 to much duration never turned on till 3500 rpms with a bad idle and no vacuum for power brakes. with the bigger valves port work, single plane intake and especially the 509 cam look how high the power comes in. peak torque comes in at 4500 rpms compared to 3200 rpms stock.
The engine was installed in a A-body drag car.
yes that would work. just think with new light weight pistons and thin rings plus a modern camshaft with all else being equal what power it could make.
What happens more often than not when bowl porting 915 or 906 heads is, if you do a really good job of properly shaping the bowl....... to the extent that it allows for an increase in flow....... you’ll have the port go turbulent and have the flow numbers start to back up somewhere in the .450-.500” lift range.
This happens when the bowl work is not accompanied by some corresponding work to the SSR.

Yes, MP warns against touching the SSR, and if the work done to the SSR is done wrong you can lose flow just about everywhere.
But if the bowl work is effective and SSR is left untouched........ flow regression after .500 lift is basically a given.

This isn’t to say that the bowl blended/untouched SSR port won’t still have more flow than the untouched port, but I’m just pointing out there are still gains to be had if the SSR gets a little proper attention.
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