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The 1.21 is supposed to be 351 CFM but, reportedly there is a difference in the testing method used by Motorcraft and the rest of manufacturer, MC, allegedly, testing the flow at the top whereas the other at the base. someone is making a convincing mistake and all the others follow. so, all...

Why won't it FIRE!!!!!! I'll be happy to lern how to do it. and i'm not being cynical. By the way, the Carter BBD is ony 195 CFM: From Carter repair manual:

RE: cherokee leaf packs Thx for the reply but since I post this I mange to gather a lot of info and the answer is that it's simply too large. the CFM rating as you wrote is not correct mainly because of different flow test used by Ford compare to the other, Ford test flow at the top where as...

RE: Big booty photochop Power valve that came originally with the 1.08 is 9-10inHG, but this is for the 302. so, it's better having two PV, one as the original and one that open's a bit sooner, say 10-11inHG, and try what's best for you're specific engine...

RE: Jeeps throwin codes...again I've just installed the mc2100 1.21 venturi on my 258. I tried almost anything to make it work but still it hesitate, bogs down, puffing black smoke, running reach when accelerating running lean at cruising. Changed the jet's from #48 to #46 and than to #50...