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Yeah but I have few different manifolds I can put on so I managed to find one to fit (portosonic) but the heads have been milled a bit to get from memory about 58 to 60 cc from the 302 closed chamber heads. You have to measure it to really know where you stand.

How can you not have free carbon if there isn't enough oxygen for it to bind to? Measuring Stoichiometric Combustion Processes In any combustion process, an amount of oxygen reacts with an amount of fuel. If the amount of oxygen exactly matches the amount of fuel, combustion is complete. This...

I've got a 318 with Enginetech pistons that measured 10 thou down after the block came to me heavily decked. Compression height for those pistons is 1.741 so if you calculate the distance with with the piston(1.741), rod(6.123) and crank stroke (3.31/2= 1.655) you get 9.519. If you go by...

But Larry and Bruce do......That's why they could do the **** they did. Knowledge......Its priceless when you have it...Others just call it plain old science.

Its called science....... What does that have to do with the established science......... Intelligent people learn from the best in the game.......

If you understood the basics of combustion and chemistry you would understand that any AFR below 14.7 would leave free carbons to find they're way onto the spark plug during combustion due to the heat and pressure generated at ignition time. Considering Bruce Robertson and Larry Widmer could...

What's the 5 gas telling you the gas balance is and what's the calculated AFR? What's the arc duration time and how smooth is it? What are you using to log the data from the pull?

You've done 18 pulls and now all of a sudden you're an expert? Image how much more power it will make when you you get the cylinder pressure up high enough to tan the plugs......

Here's @Mattax plugs and what Shrinker had to say: Do they look familiar: There is nothing happening in the cylinder. Theres no air being compressed. Its not even making enough bang to seal the rings, its even starting to look like its going to oil up the #3 plug soon. The general grey...

Yep. Bruce Robertson aka Shrinker. He also said this: "Unleaded fuel makes exactly the same colorations as leaded. There is no difference in reading a plug on unleaded. If the plug wont color on unleaded its because you havent got good vaporization of the fuel. Unleaded is much harder to vaporize."

People do, you just never come across them.

This^^^

Does it change the gas species produced during combustion?

The most telling factor is WOT Vacuum.

Its great you read its a shame you don't understand it.

All stuff to try when looking to improve combustion...... How to Pick the Best Carburetor for a Street/Strip Car Have to laugh when the smaller carb ran quickest and idles best its 425 CI on street fuel: As you can see from the Dragstrip Test Results chart, our guess that the 650 carburetor...

Bingo!

No need to, Universities and Scientific Research Labs have spent Billions doing research that you have never read nor understand and come and pretend to do testing.......You'll find it at the library. Let me guess you ran an engine on the dyno with O2's and now you know everything. Welcome to...

You can attack me all day it won't change the science and the reality of what really intelligent people discovered with all their testing.

Insecure much. We are talking about spark plugs and combustion not your ego. Very smart people did a lot of hard work to understand how this stuff works and were kind enough to share those discoveries. I suggest you learn from them.

That's because you can't...... Here's a really good thread on tuning. Tom Vaught was an Engineer at Holley and quoting Shrinker so would know more than the experts here. Start at post #150 SOME HOLLEY CARB TIPS PONTIAC forum Some key take aways: testing was on a tunnel rammed 400 ci race...

Great, How do you calculate AFR?

Why?

Tuning is Chemistry.....

Its called Chemistry.

Then answer it......You make bold claims but when it comes down to the crunch you avoid answering a simple question. Why would you be scared to answer a simple basic question?

Why are you scared to answer a simple question......... Did VP fuels tell you their fuels don't colour plugs too......

Great, since you know so much you shouldn't have any problem answering these questions, can you tell me what Stoichiometry is?

Yes it can be. It also varies between induction strokes and varies between cylinders in some cases as much as 11-1 to 17-1. Its the vaporization rate not the octane. Lower octane fuels are designed to vaporize in low compression engines. If its lean at time of ignition you haven't converted...

First you said your (US) pump gas doesn't colour plugs and it must be an Australian fuel thing: Clearly all those plugs in post #18 that are from US cars are running US pump Fuel magically show colour when you claimed they can't or won't Now you want to claim that race fuels don't colour...