I found a smoking deal on a set of stainless marine headers for my 272. The only thing is that the risers are dry, for a trs boat, and mine is a bravo.

I realize they must be cut to fit. My concerns are when I cut the ends off that the water will just flow on the bottom side of risers making major hot spots on the top 180*'s of them. How are these risers finished off? Are they capped with holes drilled into it?

My thinking was to cut the risers to fit.
Then weld on a stainless cap plate(cut to fit the ID and OD).
Drill a 3/16 hole at BDC(lets call this 0*), two 1/4 holes- one @ approx 110* the other @ approx 250*, and the last hole would be drilled @ TDC and be the largest hole I could drill between the welds.

My reasoning for doing it that way would be as such: BTC 3/16 hole -weep hole to drain all water after use, two 1/4 holes - above the lower 180* of the pipes to ensure fill/cooling, and the TDC hole - act as overflow/back up prevention.

my trs dry pipes have a 3/4 thread water dump before the transom. what you are talking about doing the cap and holes is kind of the same idea i did with mine so i could instll mufflers. i drilled 3, 3/8 holes in the end to inject the water into the mufflers.

how'd that work for even cooling?