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Alvis 3.5-litre SA 25.63 and Speed 25 SB and SC 25.63
Evolving out of the Speed 20 SC, the 3.5-litre (SA 25.63) was a short-lived model built on a 10 ft. 7 in. wheelbase with a new 3571cc 102 bhp inline six. It was introduced in 1935 but only about 60 were made. The 3.5-litre then evolved into the Speed 25 (SB 25.63) built on a 10 ft. 4 in. chassis, and using the 3.5-litre engine. It was launched in 1936, usually carrying standard coachwork, and in 1939 it was revised as the SC 25.63 no longer having running boards. The Speed 25 did not restart production after the Second world war.

 

a_Alvis 3-5Litre 1936 head
Alvis SA25 3½Litre 1936. A new 3571cc six cylinder engine was introduced in 1935 and powered the SA 3½litre, and the SB Speed 25 (shorter chassis).
 aa_Alvis SA25 3-5Litre badge
Alvis 3½Litre 1936 - radiator badge
 Alvis SA25 3-5Litre 1936 front
Alvis SA25 3½Litre 1936. The 3½litre was a development of the Alvis Speed Twenty, with a bored out Speed Twenty engine and the chassis was lengthened. Bodies were coachbuilt and often very elegant. This carries coachwork (Mark 6) by Charlesworth
 Alvis SA25 3-5Litre 1936 rear
Alvis 3½Litre 1936 SA 25.63. A short-chassis version of the 3½litre was sold as the Alvis Speed 25. The engine was also bored out to make the Alvis 4.3litre. None of these cars resumed production after the war.
 Alvis SB25 Speed 25 DHC front
Alvis SB25 Speed 25. In 1935 Alvis introduced the SA25 3½litre, and in 1936 a shortened chassis version of this became the Speed 25.
Alvis SB25 Speed 25 DHC rear
Alvis SB25 Speed 25. Derived from the Alvis 3½ litre, unlike that bespoke car the Speed 25 was series built, most having a standard saloon body by Charlesworth or this Charlesworth DHC.
 Alvis SC 2563 Speed 25 1940 front
Alvis SC 25.63 Speed 25 1940. In 1939 the SC 25.63 model lost its running boards. The Speed 25 was in essence the 3.5-litre model on the shorter Speed 20 Chassis and was capable of 95mph with the right bodywork. Bodies were series built rather than bespoke.
 Alvis SC 2563 Speed 25 1940 rear
Alvis SC 31.48 1940 saloon. Coachwork is by Charlesworth Coachbuilders. Most Speed 25 cars had standardised coachwork, and the Charlesworth Sports Saloon was one of the most popular.
 l_Alvis 3-5Litre 1936 lamps
Alvis SA25 3½Litre - lamps
 l_Alvis SA25 3-5Litre rear lamp
Alvis 3½Litre 1936 - rear light
s_Alvis 3-5Litre 1936 side
Alvis SA25 3½Litre 1936. A new 3571cc six cylinder engine was introduced in 1935 and powered the SA 3½litre, and the SB Speed 25 (shorter chassis). Charlesworth Mark 6 coachwork is carried on this chassis.
 w_Alvis 3-5Litre 1936 wheel
Alvis SA25 3½Litre 1936 - wheel.
 w_Alvis 3-5Litre 1936 wheelc
Alvis SA25 3½Litre 1936 - hubcap.
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