26" radiator for a slant six?

I once owned a 71 Valiant 4 door with a 225. What was interesting was everything was heavy duty - 8.75 with 3.23 SG, V8 torsion bars, 8.75 with 3.23 SG, and it had a 26 inch radiator.

Back story on it - I bought it from the original owner who special ordered it so he could tow his trailer! I asked him Why a slant. He said for the mileage when he wasn’t using it to tow.