Author Topic: Differences between A65 engines?  (Read 399 times)

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Dave1

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Differences between A65 engines?
« on: 18 March, 2017, 21:52:23 »
So I recently purchased a 1971 BSA A65 Lightning.

The engine in it is a 1965 Lightning rocket ( thanks to Julian on here for helping to identify). The engine needs work, and this has put me in a predicament. Would a 1965 cylinder head work with a 1971 oil in frame? Reason I ask I need to purchase new valve guides, the 1971 cylinder head, had different valve guides from the earlier engines.

Bess

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Re: Differences between A65 engines?
« Reply #1 on: 18 March, 2017, 22:24:06 »
Hi,
    My recollection is that the 1965 head rear bolts are 5/16 not 3/8.  The rocker cover studs are smaller as the head steady is connected to the head not the rocker cover.