Holley cfm rates are at sea level and 70 degrees temp. Using this info, an engine pulling the the carbs cfm rating or less, above sea level, with under hood temps always above 70 degrees(no ram air/scoop) would never need to be jetted above the stock jets. Does this seem correct or am I forgetting something?

anyone?

You wouldn't want to jet the carb up unless it's running lean in an area that jetting would change.

I would say that every particular engine is going to be a bit diff. I know my carb with a torker2 intake needed diff jetting then with the rpm intake. To me all the spcecs for jetting and all the other adjustments are very good starting points but if you spend the time with it you can get it dialed in even better most of the time.

You are correct in that it should not need rejetting.

The thing to keep in mind though is that there is no such thing as an average engine. Some tolerate more leanness than others. Some might make slightly more or less power with different delivered a/f ratios.

Mike

with under hood temps always above 70 degrees(no ram air/scoop)
How far above 70°?
Jetting is individual to each engine and the 'stock' jetting is just a starting point. There are other ways to get fuel into your engine besides the jets.

Ratings are done at CONSTANT 1 1/2 inches of vacuum.

Engines function on pulsed vacuuum, (very pulsed, if you have a dual plane intake!) and 1" of vacuum in the manifold at WFO would be considered sign of a restriction.

Gasoline quality varies, for specific gravity and BTU content, among lots of other things.

Fuel distribution in the manifold can cause some cylinders to run dangerously lean, while others run rich. Aside from fixing the distribution problem, you'll have to run the carb rich enough so the leanest cylinder won't melt.

Out of the box carb jetting is a function of educated guesses.

Schurkey, the vacuum at wot compared to vacuum used in cfm tests is something I did not know. The fuel distribution part is something I know too much about but did not think of. I am always trying to drag out the last .01 of et out of my combo and this causes me to think too much sometimes. There are times when I can't sleep at night because I'm tuning engines in my head. I guess I'm a certified gear head.