Author Topic: What Cylinder Head Does My A7SS have?  (Read 250 times)

Offline Peter Gee

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What Cylinder Head Does My A7SS have?
« on: 24.05. 2018 19:30 »
The only part number I could find is stamped on the cast in manifold of my alloy head ..either 61-1155 or 67-1155.. which turn up a total blank in the parts books I have.

I want to order theright valves and collets and caps for my head.

How many A7SS heads were they and does anyone know the numbers?

I note that my frame SHOULD have a '59 head, which is BSA part No 67-1114, ditto head as a Super Rocket but obviously not the same valve size.


Thanks!

Online muskrat

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Re: What Cylinder Head Does My A7SS have?
« Reply #1 on: 24.05. 2018 21:33 »
G'day Peter.
67-1122 is correct for yours. http://atlanticgreen.com/a10alloyhead.htm
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Peter Gee

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Re: What Cylinder Head Does My A7SS have?
« Reply #2 on: 24.05. 2018 21:53 »
Thanks Muskrat..must have been reading it wrong...bad eyesight yousee from old age. Yes, this looks good.

Offline Peter Gee

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Re: What Cylinder Head Does My A7SS have?
« Reply #3 on: 24.05. 2018 21:57 »
Do you have dimensions for valves intake # 67-740,  exhaust # 67-741?????

Many thanks

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Re: What Cylinder Head Does My A7SS have?
« Reply #4 on: 25.05. 2018 10:17 »
G'day Peter.
Inlet 67-740 = Alpha V15 = 1.31". Exhaust 67-741 = Alpha V16 = 1.28".
BUT with a little port & seat work A10 iron head valves work well.
Inlet Alpha V17 1.41". Exhaust Alpha V18 1.38"
I have them in a 57 SS head on my 51 A7 plunger  *good3*
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7