8/31/2023 0 Comments 289 engine serial numberBoth would then have been put into a stock pile of raw castings prior to machining as and when required. Both heads were cast and machined in the first run of 289 components but at different factories – due to capacity and manpower availability. To some this might seem odd as you would expect that they would both have very similar date stamps but this is not at all unusual when you consider the manufacturing and engine building process. We have tracked down a date code for the castings for you: Head two was date stamped 3G25 and with a C so it was cast on Jand was the 5150 th to be machined. Head one was date stamped 3L27 and with a W so it was cast on Novemand was the 4260 th to be machined. The date code cast into each head was different – but this was normal as the components were cast at one of two factories in batches and then machined/assembled as required later – up to 3 months later. So these were very early cylinder head castings of the new 289 engine and produced in the earliest batch of production. C: being the decade of manufacture – in this case 1960s.ģ: being the year in the decade – in this case 1963.Ī: being the vehicle type – in this case ‘generic’ Ford meaning they could be fitted to a number of models.Į: denoting the component type – in this case and engine part.
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