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I have the same issue also. You have to get all the difficult bolts on and then tighten them first. In your case go and get some bolts with a narrow head. I've even gone to the trouble of cutting a spanner at the top open to be able to tighten those bolts.

Idle Feed Restriction. If you pull the top off and turn it upside down you'll see where the the fuel travels up at an angle towards the booster outlet. Inside there is a little pressed in tube that should measure 31 thou from memory.

That sounds like the right top. Have you checked the IFR to make sure it isn't blocked or restricted in some way.

If you look at the top near the bowl vents there will be a number

What's the number on the top?

Means nothing to me. Are you sure its a 1972 TQ?

Carter 2991S appears to be from a 1960's dart 318. 1960 Dodge Dart 318 4 Barrel Carburetor Carter AFB 2991S | eBay

Brook, Those AFB's appear to be different between the first and second photos. Can you post up the carb numbers in the first photos?

That's a lot of initial for such a mild combo. I would suspect its very lean at idle to require that much advance.

I figure it should be doable. Even a regrinding the factory cam to a smaller base circle.

That's what I thought. I know they sell a kit for the fords to do exactly that.

Has anyone adapted the factory hydraulic roller set up onto an older style block?

I'll never understand why Mopar guys still use 3/8 valves. What's the length of those valves by the way?

I literally just stuck one in over the long weekend. I'm at 10-1 318 60 over. I'll let you know how it goes.

Can you remember the camshaft specs?

Here ya go, think about these statements: "When you measure the AFR of an engine and its in the 12's and the plug is white well then you have a vaporization issue like what Im talking about. Its not uncommon, in fact its the norm." And "The problem Im talking about isnt fixed with the carby...

Sorry but you ignorant combative style doesn't endear me to wanting to just give you simple answers although I already have...... Get to work.

Not true. Any time you have a richer than stoich mixture you have excess carbon. Go figure it out......Go through all the Shrinker files and piece it together.

1 Variable........

I'll say it again: I can change 1 variable and it will make the plugs read REALLY RICH when I haven't changed the AFR at all. The can go from Tan before to Black after and I haven't touched the carb. Its still metering the same Air and Fuel mixture but its now Rich.......Or is it?

If you did then you would understand that there's not enough for all the Carbons and Oxygen molecules to pair up. That means there's excess Carbon to find its way onto the plug. Lambda is different for different fuels. Using Lambda to Determine Air/Fuel Ratio The result of the calculation is...

You sure it wasn't because you like Turtles?

Don't need to. Its very well established in the field of Chemistry what Stoichiometry is. That's why there's different Lambdas for different fuels.......You can be on either side of stoich either rich or lean depending on the AFR of different fuels. You can give an engine a rich mixture and...

Where not talking about Lean mixtures looking Rich we're talking about Rich mixtures having excess Carbon to Air ratios which means there's not enough carbon to bond to the lack of oxygen. That means there's more Carbon than there is oxygen. If its not Rich enough around the plug at ignition...

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...