What is a 361 big Block ?

Same stroke, 3.38.
2.08 intake valve, 1.74 exhaust valve
These engines can perform but we're allwas left behind since the 383 came out.
The only part of the engine that is now a custom part is the Pistons and mayyyy be the rings depending on actual bore size.
After that, it takes on every regular performance "B" engine part.