Is my 340 stroked

67Dart273 said

Jus' sayin but you are not gonna measure stroke with an angled anything stuffed into the plug hole. I thought you had it torn down?? Is the pan off? Is the intake off? You could mount a reference "jig" and measure the stroke off a rod bolt cap or nut/ bolt end.

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Welding rod works pretty good. Put the engine at TDC, slide the welding rod into the plug hole and set it in a valve relief if you can (so it stays roughly in the same spot). Put a sharpie mark on the welding rod at the plug hole. Turn the engine over and put that cylinder at BDC, put another mark on the welding rod. Measure between the marks.

Will be it the exact stroke measurement? Of course not! But you don’t need to be all that accurate to know if it’s a 3.31” stroke or a 4” stroke now do you? Heck even if it was a 3.58” you should still be able to tell pretty easily.

I wanna know how the OP doesn’t know it’s a stroker. Because usually if it is and you bought it from someone else they’d have told you at least a dozen times the engine was stroked. 3rd hand blind auction or something?