Selective fitting of the throttle plates usually creates a near-perfect seal with the throttle base. However, after assembly of the base, I apply DAG 213 regardless of the fit.
There are some bases that will not allow a tight fit with used or new throttle plates. The use of a brass or plastic flat punch and judicious use of a hammer always helps improve the fit. But, I also use DAG 213 on these bases--with good results. I have restored many end carbs that still, after 50+ years, have DAG 213 in place on the plates and cast iron base bore.
I cannot criticize lapping the plates and base for a good fit, but it will take more than a few snaps shut to remove enough material to be effective. Try it some time and you'll see.
The factory used DAG 213. The picture is of a NOS base from the early '60's on the left and a base I applied DAG 213 to a few years ago.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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