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It's a smog feature. Ah, no wonder it performs badly... Fortunately I have spares of both a combination manifold and separate manifolds. Like I mentioned before, this car acquisition is an excellent parts fit for me.
Earlier this year I got a separate intake so that I could do my B20E d-jet conversion on the 220 (I wanted to keep my carbs for a while, but wanted to upgrade the exhaust). Sadly, I was not able to successfully get that vacuum plug out without making a mess of it, so even with cut washers, my choice appears to be limited to my spare one-piece manifold with a broken stud nut... Looks like some drilling and reaming is in order today. Once I get those carbs apart...
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