bob_9447 Posted May 4 Report Share Posted May 4 Hi, I have just bought a 13/60 and it's engine number is RD1226ESS. I am confused because RD is supposed to be 1300 FWD. Can any one PLEASE help me understand this engine. Link to comment Share on other sites More sharing options...
DanMi Posted May 4 Report Share Posted May 4 The engine blocks are the same, there is no problem building an engine for a herald using a 1300 fwd block herald crank etc or the other way. The engine number only tells you what it was when it left the factory not what it is today. It was also originally a new replacement 1300 fwd hence the ESS. I could build a 1300 engine into a 1500 block. After more than 50 years and numerous rebuilds the number tells you very little Link to comment Share on other sites More sharing options...
johny Posted May 4 Report Share Posted May 4 Trouble is it makes it more difficult to know exact spec like compression, cam, valve sizes, crank bearing sizes etc but then for many of us these can have modified over the years... Link to comment Share on other sites More sharing options...
Colin Lindsay Posted May 5 Report Share Posted May 5 I had a photo of a rivetted badge on the side of a block to indicate a factory spare engine, can't find it now but here's some data from another website a few years back: Link to comment Share on other sites More sharing options...
bob_9447 Posted May 7 Author Report Share Posted May 7 Thanks everyone for the info. Link to comment Share on other sites More sharing options...
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