I went to Home Depot and got a brass T fitting back in the day, I would post a pic, but the car is long gone.
Good idea. That'll work too.
But.... I don't love idea of adding yet another dissimilar metal to the mix. Cooling system corrosion is already an issue on these cars.
We have mostly iron and aluminum, and a little mild steel. I always thought the water pump nipples were stainless steel. The original Gates/factory nipples NEVER rust. The aftermarket/reman pumps do rust though. Later remans use coatings as well to hide this detail.
As far as I know, there isn't much brass (if any at all) in the LT1 cooling system. Last heater core I changed was all aluminum. And of course so is the rad. Maybe the inserts in the plastic surge tank/reservoir are brass? Unsure... as they could be mild steel as well.
Anyways, common sense dictates that iron pipe is safest. Stainless steel seemed to make sense since it's less reactive than brass in our setup, and I assumed the original water pump had stainless parts. But I've questioned stainless steel as well for the same reason as brass. Back in the day I had these discussions with guys at the track and most felt that stainless was less reactive than brass in our specific cooling system. I'd be curious if anybody else here had other opinions.
Granted brass has been used on cooling systems for decades. However I usually don't see brass + iron + aluminum mixed. Older cars had brass rads and brass heater cores AFAIK. Once aluminum radiators became common, the heater cores seemed to follow suit.
Anyways, I'm probably overthinking this. But I've run the stainless tees on multiple cars for 10+ years and haven't seen any harmful side effects yet. I do flush my coolant every 3-5 years. And refuse to use Dex Cool.