Transom drain hole is a snug 1-1/4".......most are 3/4" O.D.
Where can I find a larger Garboard drain? preferably, SS or chrome.

If it's a hard part to find Earl may have it. Back in the spring I bought a 3/4 transom drain from Earl, I believe I saw larger ones there.

https://www.marine-sales.com/catalog...ml1p42a0vk0rd3

Mark,
Of course I drilled the larger drain hole in the new transom before I realized not to many out there (3/4" plug) garboard drains. There's plenty of the 1/2" plug types......thanks will call monday.

After Jeff found a new Sudbury vent for his Magnum there anything is possible.

Scippy Perko should have larger ones,my catalog shows one that is 3/4 and one that is 1 inch. Go to www.perko.com,call and I can walk you thru it... Bud