Re: Engine and Head Numbers

Posted by HH56 On 2018/8/21 10:55:50

D1xxxx indicates a 41 engine and what appears to be an A suffix indicates something has been changed from original spec in the engine or drivetrain. In some of the service letters and counselors there are charts and articles indicating what was different but as far as I know, they have not been compiled into an overall list for easy reference by year. It is necessary to go thru each service letter before and after a model year to try and find an article mentioning suffix numbers. The suffixes varied by year and in some cases changed items were also indicated by a dab of different colored paint or just a symbol like a star or pound sign instead of a letter.

The casting number on the head is likely of very little value in identification. Machining would have determined the final part number and compression ratio etc.