While I was building my 4.125 striker a guy copied my recipe of one of the milder versions and we compared dyno sheets. This was same top end and cam but 4" vs 4.125

Bottom line the 4.125 made more hp & tq and it made it earlier, longer and seemed to win all around.

If I remember correct as I don't have the info available right now it was about 20 & 20 hp& tq difference.

544 & 566 are coming to mind on the hp levels but that's about all I can recall at this point.