Engine Identification

[malzstx]

I have just bought a fully restored 1961? Road Rocket( 1st. registered 2006?? on Reg. Document) ) latest MoT 2008-2009 and on checking the engine number,CA10R 10139 my research shows it to be from a 1954 model but it has an IRON HEAD!! The frame number (from MoT cert. shows   GA 720384 but I can't find this in BSA listing models.I have also discovered that in 1954, alloy heads were introduced, but 1) is it possible that early '54 Road Rockets could have iron heads then changed to alloy in that same year,which may account for my iron head?

2) The frame number on the Mot cert. shows GA 720384 .......I can't find this serial number in the model listings?? Can any of you knowledgeable guys help me with my problem? I am a new member, Thanks, Malcolm.

 

[trevinoz]

Malcolm,
                   I would say the frame is GA7 20384 which is 1961.
The engine CA10R 10139 would be a 1959 Super Rocket which has lost its head or maybe a 1956/7 Flash which has found an "R".

  Trev.

[Rocket Racer]

we always like pictures if you want feedback. re your question the road rockets all had alloy heads and thick flange barrels.
On most/many motors you can find a date stamp which accurately dates the cases.
Likewise look for secondary stampings such as HHC or HC near the engine numbers.

Nothing wrong with an iron head.
54-55 half width hubs, 56-57 ariel hubs, 58-on full width cast iron hubs (excl RGS)

very easy to mix and match these bikes from multiple years and models...