Quote:
Originally Posted by red122
I have a B18 Block bored out and now on a B20 head gasket although retaining a B18 head . I have several old distributors JFUR4 type with either 077 or 026 as the numbers .Not sure exactly what engines that these are actually designed for ? Which would people recommend for my fast road set up with twin carbs ?
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026 is B18A and 077 is B20A. Both have vacuum advance.
Twin carb cars didn't have vacuum advance: B18B had mechanical advance only - a BRILLIANT distributor in my opinion, 009 or 003 - and B20B was similar, but with a useless vacuum retard thing which never worked well.
Advance curves for cars with twin carbs were different to single carb cars so, although the distributors you have there will work, they won't be the best option for your new set up there. You say you have a B20 head gasket, is that a B20B (thinner) gasket in order to alter the compression, or did you alter the B18 head to do so?
My best distributor is the full mechanical advance form B18B that you can slot in any modified engine and set to full advance at 3,000 rpm and it'll pretty much work beautifully. Second best would be a B20B distributor, but just leave the vac unit disconnected. The latter gives the small benefit of the less fiddly one piece points.
Good luck, I've been looking out for 003 and 009 distributors for a while now!