Re: 1966 GMC 305 V6 Service
Rufton: Thanks for the detailed images of the oil filler cap. The cap in my 305E has two thinner mounting tabs on the underside. It kind if resembles the tabs on a breather/oil filler cap. I will consider trying a cap like yours. Can't explain your spotty fuel consumption, but mine is in the shop right now getting a proper tune since it has been backfiring a little. I may have damaged the power valve in my Holley carb
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