• 1963 Tempests with different front end styling versus what was finally used in production.
  
• Pontiac used Cadillac bodies during development of the transaxle, which led to the 1961 Tempest.
  
• The first 1961 Tempest four-cylinder engines were made by putting bob weights in place of piston and rod assemblies in 1958 V-8 engines in Chieftains.
  
• 1958 big Pontiacs were used to develop the XB-60 "rope-drive" transaxle for the 1961 Tempest.
  
• The name "Ventura" was often used on concept sketches for proposed Pontiacs and Tempests.
  
• Pontiac built experimental 1961 Tempests with 316, 347, and 389 cid engines.
  
• A 1961 Tempest was built with a side-mounted radiator and an engine compartment with seals.
  
• A 35,000 mile chassis lube was intended for the 1962 Tempest.
  
• The 1963 Tempest 326 cid V-8 was really a 336. In 1964 it became a 326.

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