Not hard to pressure test those headers. A good tech should be able to do that right on the boat. I have some Gil manifolds that I just pressure tested a month ago. Got some rubber plugs from Menards and hooked up a leak down gauge and hit them with about 30# of air. The riser's are a little tougher.
Thanks for the info it makes sense I’ll give it a go once I get the deal done. I do leak downs on race engines all the time I’d imagine it’s similar
