| Re: [GMCnet] what a difference a spring makes [message #325390 is a reply to message #325388] |
Tue, 24 October 2017 15:12   |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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Keith V wrote on Tue, 24 October 2017 11:37Last night I was reading about carb tuning and one thing I kept seeing is people saying you cannot read spark plugs anymore with reformulated gas as they are always white.
So I guess I'd be careful about that.
I was also looking at power vs economy curves for AFR and it looks like I might still be a bit lean. I just know that the next fatter jets will put my cruise AFR into the 13:1 range and I'd rather stay out of there during cruise.
I wonder how accurate Jets are, should I try another set of 69's?
It IS kind of a PITA to swap out jets, but it wouldn't hurt to try the next size up if you're up for it.
I went to 72s on the recommendations I got from here and even with those, I ended up with a cracked exhaust manifold and, eventually, a burned exhaust valve. Now whether those were related to my AF mixture is a matter of conjecture, but maybe.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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