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Do a google search for triumph serial numbers, that will enable you to pinpoint year of production. Use the stamped serial number on the area just below the cylinder base on the side of the aluminum left hand case (drive side). Models are as follows: 6T is 650 t bird, T110 is 650 T110, TR6 is 650 TR6, T100 is T100 500cc, T120 is 650 Bonneville, TR5 is 500cc TR5. Good luck.
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Discussion Starter · #3 ·
I guess I should have taken a pic of the s/n. It decodes to a 1960 T120 Bonneville but it has what I think is the wrong crank and an iron head, that's what made me think it is something else with T120 stampings or cases?
 

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Most of the pre unit stuff I have and have seen is a mixture of parts. Don't be surprised if cases, head etc didn't leave the factory together.... especially after 50 years in circulation.
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Definately a 1960 year model, or at least the timing side is. That 59 is a date code, means it was cast in 1959 for the 1960 model year. Looks like an old 6 bolt crank and an iron head. Although there were T-Birds with Iron Heads at last a 1962 I believe
 

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Discussion Starter · #9 ·
Thanks for the help guys.
I think I'll throw it back together like it was, should be good enough for a beater.....
Any idea what length pushrods should be in an iron head 650? Best I can tell they should be about 6 1/2" ish
 
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