Probably, with the extended fan neck for the higher radiator, a 1938/9 TA/TB/TC 25.63 Crested Eagle engine. This model was also marketed as the ‘Alvis Twentyfive’. As no revolution counter was fitted the gear drive under the exhaust manifold was blanked off.
Alvis Archive 
Probably, with the extended fan neck for the higher radiator, a 1938/9 TA/TB/TC 25.63 Crested Eagle engine. This model was also marketed as the ‘Alvis Twentyfive’. As no revolution counter was fitted the gear drive under the exhaust manifold was blanked off.