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I have a 1980 Scorpion 2.6 5 speed which I'm slowly working, here are the results of my drag runs: Stock standard - 18.396 Side draft carb - 17.194 High comp pistons, race cam, head work - 16.769 Diff ratio change 3.54 & LSD - 16.520 I do one project a year and then a drag run to objectively che...

One last thing. If you put the bigger valves in the head, you will need to get the head worked slightly to fit the right valve seats (as they are bigger) and the new seats pressed in. I had that done by a head shop, however, the port and polish I done at home. My compression calcs were estimated to ...

Hi mate. First post but i saw yr response and was hoping to share some experience. I just finished rebuilding my Scorpion motor. Used the astron 1 head, flat top pistons (1mm o/s), shaved the head 20thou and put in a big cam and single 45 delhorro side draft. I don't get any pinging... In order to m...