Which radiator fittings can serve as the steam port on an LS swap radiator?

Two common options:

1. A radiator with a built-in steam port. Most LS swap radiators include one, so the steam line runs straight to it.
2. An upper-hose adapter with a barb. Speedway's LS swap radiator hose adapter (listed at $24.99 in its article) fixes both problems at once: a 1/4 in hose barb takes the steam line, and it adapts the LS water pump's 1-1/4 in upper outlet to the 1-1/2 in inlet on a typical radiator. It works with a radiator that has no steam port.

Why it matters: On most LS engines the thermostat sits low, on the water pump, instead of up top like older small- and big-blocks. GM added steam lines in the cylinder heads to vent trapped air and keep hot spots from forming at the top of the engine.