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They all colour plugs.......

Different colours indicate different gas species produced. Temperature is pressure.

Here's a 2011 jeep on modern fuel in the US: Here's a set of plugs of the North American Subaru Imprezza forum: North American Subaru Impreza Owners Club Looks like new cars colour plugs too on street fuel in the US....... 70k Spark plug change on 2nd gen. Should my Plugs Look Like This?

There is no difference between street fuel and race fuels when it comes to colouring plugs. It takes more heat to gas the street fuel that's why you get white plugs because its LEAN at time off ignition. The OP should try some Avgas and see how that performs. Or try a smaller carb to increase...

I would first try an NGK plug and a 750 DP and see if it picks up the top end.

Its an indicator of cylinder pressure.

And yet how many times have you heard its like a light switch at 3K......

You think you did more testing than Shrinker?

Neither of those.

Isn't that the problem? As you progress on your journey and you look for answers and the previous sources cannot provide you need to look elsewhere. There is a very well know Chinese saying: "When the student is ready the master will appear."

What happens when an engine makes more power when you increase the air temperature?

"In the case of our drag car we use VP fuels C14+ We have tried others with different distillation and oxygenation etc but they create other tuning issues. I have never maxed out the capabilities of the C14+ and changing to other fuel charateristics just mucks up my knowledge base." This plug is...

Guess that settles that then. Out of curiosity where is C14 Race fuel made? This stuff here: VP C14 - Dominant Fuel in NHRA Championship Racing | VP Racing Fuels Is that made in the US by any chance?

Bruce stated otherwise.

Any hydrocarbons fuel. Makes no difference If it's leaded or not.

And stick a 2 inch open spacer on it and increase the plenum size.

I'd use it: Mopar Performance Parts - Horsepower Hop-Up It was only down 17 HP at 5400 RPM on a 340 against the airgap.

Yeah have a set of heads like that that a friend has done. He melts aluminium down and pours it in then tidies it up.

Buy a Crane Hi-6 and PS92 coil and never look back. Swapped out the MSD for Crane and instantly it idled and ran better

Yep, I have seen that exact same thing with a pulley change on the alternator not allowing the CDI to fire correctly causing what can be misinterpreted as a rich condition. Half a volt was all it took to make it change the burn considerably.

Funny that. Look at Cranes 260H

One that closes the intake valve at the right time to build enough cylinder pressure.

Depends on where you close the intake valve. As always run more comp.....

Hey John any chance we can get some pics if the Valiant?

Yeah that manifold was interesting in that it had long runners that were fed from a small open plenum or so it apeared to be.

That's interesting. I was just looking at 3.5 litre BMW coupe from the late 1970's or early 80's yesterday but it was injected. You wouldn't happen to know if that Solex is a divorced Idle design?

This^^^

The sharpest guys I know stated it took 12 months to properly tune an engine.

Now put some comp into that 318.... Here's the cam regrind @ Crower:

WTF!?! They went to all that trouble and the stayed with the open chamber and they didn't go aluminum?