Rough idle and takeoff 250 inline - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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'68OrangeSunshine

Senior Member

Join Date: Feb 2002

Location: Tucson, AZ USA

Posts: 7,339

Re: Rough idle and takeoff 250 inline

Quote:

Originally Posted by 68gmcdude

0 degrees TDC... According to the manual, that is the setting for the 250 with the A.I.R. system (smog pump). RPMs @ 700.

Do you still have the A.I.R. pump working on the engine?
I bought my '68 C/10 Stepside in 1973. I discarded the A.I.R. gadget in '74. I was no longer in California. It hit the bottom of a GI can with a satisfying CLUNK.

I have a 292 L6, bored .030 over, I set my timing at 12*.

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Every 25 years I like to rebuild that 292, whether it needs it or not.

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