Anyone ever run their slantsix thru smog testing?

I have a 91 D150 with a 318.. its tired and can't pass smog now. Its allowed 160ppm on the HC and its blowing over 200 with a new cat. It also only ever got 10-12mpg..

I have a few good slants and was thinking of swapping one in.

Has anyone ever smog tested their engine and have some numbers? I need to know if a slant has a chance of hitting 1991 numbers.

I can't really justify rebuilding the 318 because the value is so low on the pickup and it gets such crap millage.

Yes, but only at idle:

HC ppm: Vehicle reading 261

Max allowable: 968

Average passing reading: 202


This was with a decently tuned slant in a 72 Dart, with an (converted) electronic ignition. For some reason I thought I'd do better than average...

This is with no Cat. The paper also says I should get 100kms out of 9.4 litres of gasoline... Seems a bit optimistic

25mpg maybe on the highway

Long time no post Mr Chrome Alternator......

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Yeah....Im the one who destroyed this rare, vintage automobile.....