The 6T Thunderbird did get some performance upgrades, however. Shell-type big-end bearings replaced the previous white metal type. This called for larger and thus heavier connecting rods which ...
The 1956 Triumph Thunderbird retained its old cast iron head and all its overheating problems, while the new alloy “Delta head” debuted on the Triumph Tiger T110 and the new for 1956 Triumph TR6. This ...
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