Rebuild Runs Rough

nm9stheham said
I suspect that IVC of 42 is at .050' lift....I was thinking of 'advertised' closing.

Yeah, nothing really changing that stands out. 3-4 cc's won't change CR all that much, as you surmised.

Suspect the fuel too.

teringer said
we ran alcohol in a late model and needed about 45percent more jet in a carb , is your fuel percent correct for e85?

Yes ivc is at .050

I most likely had a winter e85 blend with the last engine. More gasoline, as much as 10% more. I probably have a more true e85 blend, now. I’m still able to trim fuel, I have full control, and its attitude feels right on my afr gauge. As I tune, and force a lean idle, the gauge goes towards 15:1 and beyond that it runs poorly, vacuum is reduced, as one would expect.