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Found this for sale, said it's a 71 Thunderbolt
Don't have any numbers as of now, but i'm guessing it isn't a 71?
Also what would I look for to verify it is or isn't a 71?
where would you look to verify the mfg date?

Since i'm kinda new to older bike, expcially brit one's, the title should match the motor numbers, correct?
 

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71 and 72 had a bigger rocker box, the cover has two bolts in the top on the flat section(its mostly finned on top) that were used as a top mount or head steady type deal. that was the only two years that had that style head and cover. besides that check the numbers

heres a pic of the cover.....some earlier models had a cover that looked like this but did not have the two bolts in the top
 

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dankchoppa said:
71 and 72 had a bigger rocker box, the cover has two bolts in the top on the flat section(its mostly finned on top) that were used as a top mount or head steady type deal. that was the only two years that had that style head and cover. besides that check the numbers

heres a pic of the cover.....some earlier models had a cover that looked like this but did not have the two bolts in the top
That and the whole Oil In Frame deal.
 
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