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Numbers
Posted: Sat Oct 18, 2014 4:52 pm
by minidean
Found these numbers stamped on the engine. I know the engine has been modified and I believe these number have something to do with this. But what do they actually mean?
Re: Numbers
Posted: Sat Oct 18, 2014 6:57 pm
by Craig
The 1002 may be the job or invoice #.
21.0 CC is the combustion chamber volume.
0.040 is the amount of material that has been removed from the face of the cylinder head.
Craig
Re: Numbers
Posted: Sat Oct 18, 2014 9:17 pm
by minidean
Is there anyway people can work out who's work this is?
Re: Numbers
Posted: Sun Oct 26, 2014 5:56 pm
by minidean
I was contacted today by Brett Simms Motor Sport (Ex Longman employee) who confirmed the numbers on the head mean that this work was carried out by Richard Longman & Co in 1976.
The following was confirmed:
Number 1002 is the head number which all details of valve sizes, springs ,chamber volume and customer name and date when done
1002 is a GT 6 road head
1.405 inlets
1.150 exhaust
road spec springs
The second number is chamber volume
The third number is the amount skimmed off.