Richie15 Posted October 5, 2015 Report Share Posted October 5, 2015 Hi everyone. I am getting used to the forums and search mode, very helpful and glad to be here. My questions are this: where are the block casting numbers of my 23 inch head 6 flathead? (for some reason the serial number has been ground off) so the question is about where can I find a chart so I could determine which engine I have. The reason is I may want to rebuild it as it is in a 1940 Plymouth truck and I don't think I will find a correct block *PT*105*XXXXXXX*, well, so far no one in my search for that has answered. Any help appreciated, Rich Quote Link to comment Share on other sites More sharing options...
Young Ed Posted October 6, 2015 Report Share Posted October 6, 2015 You are correct the PT105 block would be a hard one to find. Neither mine or Dads 40s still had them. His has a later replacement engine that because it was titled by the engine # is stamped with it. If its a 23" its most likely either a 218 or 230 and you can measure the stroke to figure out which. 1 Quote Link to comment Share on other sites More sharing options...
Richie15 Posted October 6, 2015 Author Report Share Posted October 6, 2015 (edited) Thank you for the reminder, I will measure stroke, go from there. Rich Well this makes it easier; head is dated 11 19 51, casting number: P ( Plym ?) 1405849-12 With this date it is a 218 (if is Plym), I will measure stroke closely today. Edited October 8, 2015 by Richie15 Quote Link to comment Share on other sites More sharing options...
wayfarer Posted October 7, 2015 Report Share Posted October 7, 2015 Unless the truck is uber original then you could find/rebuild just about any of the L-head engines, including the 25", and have it ready to go when the urge strikes. Yes, a 25" will involve some additional work but provides a lot more grunt. 1 Quote Link to comment Share on other sites More sharing options...
Richie15 Posted October 9, 2015 Author Report Share Posted October 9, 2015 Hi, stroke is 4 3/8". Was interesting to find that Dodge truck 230 from 1942. Would be better, even a 25", but I just want to putt around town, plus I have extra parts for the Plymouth 4 3/8 " engines. I will pull the engine soon but decide this winter, check the cylinders maybe get away with new rings/hone job....lap the valves, then have a close look at bearings....so far internals look good but valves/rings must be done. Is a inexpensive valves spring tester be good to test them, what is the name for this tool? Rich Quote Link to comment Share on other sites More sharing options...
wayfarer Posted October 9, 2015 Report Share Posted October 9, 2015 Springs are likely much cheaper than a spring tester so suggest just replacing them. 2 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted October 9, 2015 Report Share Posted October 9, 2015 the odds that you actually need to test these low compression springs is equal to the odds you going to run at the upper limits of the RPM that one could possibly float the valve.. 1 Quote Link to comment Share on other sites More sharing options...
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