<div dir="ltr">Simon -<div><br></div><div>You'll need to do a roadside timing. With contacts, it's easy because you can twist the dizzy until you see the contacts open at TDC, then start the car and advance the dizzy a bit until you get smooth running. Usually that's pretty accurate to within a couple degrees.<br><br>Since you have a pertronix, I would recommend fitting the dizzy first and using a timing gun figure out where it's supposed to be, then make a mark at the bottom of the dizzy with a permanent marker so that you can just pop it in the right spot if you ever get in trouble.<br><br>Best,<br><br>Alan</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 27, 2023 at 4:04 AM Simon Lachlan via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg7369389827087795963"><div lang="EN-GB"><div class="m_7369389827087795963WordSection1"><p class="MsoNormal">I should probably be able to work this out for myself, but – just to be sure – I’m asking the experts.<u></u><u></u></p><p class="MsoNormal">Talking about a Lucas DM6a in a MkII BT7. And a 123 alternative.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">So, I have a 123 installed in the car and a Lucas DM6A, complete with Pertronix, in the boot. (Trunk!) Yes, both distributors have the correct “Drive dog(?)” on the bottom. (Part 25 in the attached pic).<u></u><u></u></p><p class="MsoNormal">Thus, it is mechanically possible to remove the 123 and drop in the Lucas in its place.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">My question is this……if I manage to accomplish this without messing up the timing ie rotating the distributors in the clamp, will everything line up and the engine fire up?? I hope that the Drive dog will/can only slot into one position and that will be the one and only correct position. If you see what I mean?<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I hope to be able to carry the Lucas as a spare “get you home” and, likewise, hope that it’s a straight swap without having to frig around with the timing.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Am I correct? It’ll be a straightforward swap or will it turn into a complicated roadside tune-up??<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Thanks,<u></u><u></u></p><p class="MsoNormal">Simon<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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