Super Vee Engine question

Need some help identifying thread size. This is a 1.6L rabbit water-cooled engine for a Super Vee. I am building a side mount for it to mount it on my engine stand and want to use the four bolt holes shown (three are larger and one is smaller). I believe they are 8mm and 10mm and I have tried all 3 thread pitches (1.0, 1.25 and 1.5) but none seem to thread in. There is some rust evident in the holes, plus I don't have metric taps. A metric tap set may be my next tool purchase but in the meantime if someone can tell me the correct size and pitch I will just buy the 2 correct taps for now.

All help is appreciated.

Call Bob Morris

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Originally Posted by Lee Follansbee

Need some help identifying thread size. This is a 1.6L rabbit water-cooled engine for a Super Vee. I am building a side mount for it to mount it on my engine stand and want to use the four bolt holes shown (three are larger and one is smaller). I believe they are 8mm and 10mm and I have tried all 3 thread pitches (1.0, 1.25 and 1.5) but none seem to thread in. There is some rust evident in the holes, plus I don't have metric taps. A metric tap set may be my next tool purchase but in the meantime if someone can tell me the correct size and pitch I will just buy the 2 correct taps for now.

All help is appreciated.

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My two cents more than a tap you should have a set of Std and Metric thread pitch gauges. Would not be the first time in history that someone changed a thread.

For future use, buy a product called Thread Detective to identify mystery bolts and bolt holes. I have three of them, and they have proven to be useful on many occasions just like the situation you're in now. Well worth the money.

Found a 10m x 1.5 tap in my misc. tap pile (we all have one of those) and that's what the 3 large ones are. Thanks for all your help everyone.