Did they ever try to replace the Allison with the "Packard Merlin"
Hi
Danny. No, in fact the low altitude people preferred the Allison, as it had better fuel consumption and was a far more robust engine than the Merlin. In fact, when the production switched to the Merlin version, there was an attempt by some to keep the Allison version in production, but to no avail. The RAF were still operating Allison versions in the European theatre right to the end of the war.
Should you like to send me a PM with your email address I can send you a lengthy report re the Allison in the low level role (USAAF report based on the RAFs experience).