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If I'm seeing your measurements correctly, t appears the "new" dist has a slightly larger diameter than the "old" one. As long as the o-ring fits snug against the intake, you're good to go. The clamp holds the dist down square against the intake. 

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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

O.K., thank you. I thought that an O-ring should be there but my original didn't have one or the new didn't either. I see no groove on the orig. and new distributors. I looked at the Parts Manual and Assembly Manual also. Did not find an O-ring referenced. Are there any resources for the O-ring for an 1981-350?

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   My bad....no o-ring on the dist....just a thin gasket at the base. Regardless, the fit between the dist and intake isn't all that tight...

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Not to worry, it's O.K., it's actually a great idea. I remember, so long, long ago internal combustion aircraft engine magnetos had them. Thanks

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