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Number on TR4A cylinder head

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only the TR4A cylinder head has a number stamped on the front / right side.

I always thought it is a serial number, but on both heads I one (1 spare) it is the same number...

What is the issue with this numberm, please.

Ciao, Marco

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Hi Marco,

The number stamped on the head horizontal plinth is the TR4a series number, ie if it has the 511695 number ( from memory) it is indicative that it’s a TR4a head. Hope that helps.

Mick Richards

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Hi Mick,

yes, this is the number, I always thought it is individual,

but yesterday I noticed it is the same on both head, ie all 4A heads!

Thank you for your answer


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