The same answer applies really. You want to add bore size? Or stroke or whatever. But sticking with bore size, 1.3 sq in will add, let’s just say, 5 HP on a stock engine. Add a cam and retest, it’s now a 15 hp difference. Add cylinder heads, let’s say, OOTB Edelbrocks, that’s 15 more? 25 more? Now let’s take away the cam and out the stock one back in, the. Change the …..
You get the point I assume. It’s not an answerable question across the board.