Identifying what Daihatsu engine in Tuk Tuk

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Hi,
I hope this is in the right part of the forum, sorry if its not.
I've recently bought a Thai Tuk Tuk which is Daihatsu Powered. I need to get a new head gasket for it, but am not sure what model engine it is? Would anyone know if there are any identifying marks on the engine hidden away to let me identify the model? i think it is either a 550cc or 650cc.
Many Thanks in Advance
Sidzz

TukTuk's get bodged together

TukTuk's get bodged together out off all sorts of Daihatsu stuff.

It will either be a CB engine series, or an E engine series.

They both have marking cast into the block, quite large letters either on the inlet manifold side or the exhaust manifold side - normally about half way up the block to one side.

Http://www.daihatsuhijet.co.uk
For Hijet manuals and information