Does Larger Testicles = More Testosterone Production?

Just as the topic says, does having larger testicles cause one to have higher amounts of free testosterone and/or DHT circulating within the blood stream?

No.

Testicle size isn’t related to testosterone production. Testosterone production is a serum regulated process, and only a small fraction of a single testicle (probably 1/10th or less) can supply the body’s full need. Testicle size does have a direct relationship to maximum sperm production capability, however. Of course, sickness, malnutrition, and other environmental effects can lower sperm production.