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520 CI Stroker 440 Engine Problems In 1967 Fury

DanielSlocum said:
It sounds like the valves may not be fully closing once the engine reaches a certain temp.
That can happen if hydraulic lifter plungers are bottomed out due to misadjustment or pushrods effectively too long.
Another possibility could be valve guides being too tight causing vavlves to stick.
Good luck.
Click to expand...
Am I right in saying a vacuum gauge can help diagnose this issue?

They are pretty cheap.
 
As others have said, basic engine mechanics should be applied. Start with a vacuum guage. If its reasonable move to fuel. How big is the fuel line from your tank. If its 5/16 thats your issue. If it has a small kink, thats an issue. Is the fuel tank clean and the pickup sock clean? As mentioned, unhook the electric choke wire and hold the choke open.

I dont think anything is wrong with the engine. If there was it wouldn't run strong then not, then strong again. It's something in the engine support system and likely a fuel starve.
 
will he sell the car as is?

reading back on the C bodies site, the step dad retards the timing then he advances it and yall have swapped carbs several times, and then there is a fire in the carb, then it runs great last november, and you pull it out and it runs awful?

ignition, vacuum and fuel pump/carb are things that need to work together.

as someone i watch on youtube says, "new parts dont necessarily mean they work".


out of curiosity, what transmission?
 
here's some stuff in the C body thread from 2020:

John, This 520" stroker was built by the same shop that built my 520" stroker. Sadly the owner passed away suddenly a few years back. As noted, the engine builder set the timing chain for the roller cam at 2 degrees advanced. This engine has 440 source massaged aluminum heads, aluminum intake and a roller cam whereas I do not have those in my engine but the bottom ends are the same. It was built to be a torque monster since it was going in a '67 Fury.

Different mechanical high performance fuel pumps were tried and an electric fuel pump was added (I did that with the electric pump being what I refer to as a "pusher"). I don't know if he checked fuel pressure but that was one thing that I was thinking about as well. With my set up I have a fuel pressure regulator in line before the mechanical pump.
Click to expand...

so one guy with identical engine and electric pump setup runs a fuel pressure regulator.

also, we now know the engine builder set the timing chain at 2 degrees advanced. how much ground-in advance does this cam already have?
 
pnora said:
Where does that electric choke get its power?
Click to expand...
Hopefully this thread doesnt scatter every which way like the fcbo thread did. Are you thinking the electric choke is affecting the ignition coil from a mis-wire ( pulled off from the closest place, but not the right place)??
 
Lefty71 said:
Hopefully this thread doesnt scatter every which way like the fcbo thread did. Are you thinking the electric choke is affecting the ignition coil from a mis-wire ( pulled off from the closest place, but not the right place)??
Click to expand...
Yes I am. It was just a quick observance. But as most of the posts the poster ignores possible simple fixes.
 
pnora said:
Yes I am. It was just a quick observance. But as most of the posts the poster ignores possible simple fixes.
Click to expand...

5 years in that other thread, and not a single vacuum reading at idle, that i can find.

also i just see "about 10 degrees" advance timing at idle from 5 years ago.

i need to look away from this train wreck. but i cant.
 
Am I seeing it wrong, but tell be those rockers don't look right? As in... over adjusted becasue they all look "closed" or partially open, which would not be the case across an entire bank.
 
As an engineer in the industrial world for way too long solving problems, I am a data guy. Gotta have data. I would be putting an electric fuel pressure gage at the carb and monitoring the pressure in the car. I think I even have one you can borrow. I used it to troubleshoot my coronet and found that I never could get the mechanical fuel pump to work so went electrical.

I would start there and go from there depending on what you see. And I agree with Bill from the FCBO post that dump the old fuel. None of my tractors or small engine tools or street cars see ethanol fuel. I can buy non-ethanol in numerous places around me, and a bit dated, I know there was a place on the Berlin Tpke that sells it. I was looking to get non-ethanol fuel for my mom's stuff. For the extra $1 per gallon I pay its a no brainer for me.

My mom is calling me to visit again (New Britain). I would be happy to get together and chat about the car. Been doing this a long time with various hp levels - current race car is 1060 hp. Street/strip build is 713 hp with TF270 heads.
 
Agree with post #24.
And #30. DUMP all the old fuel, start diagnosis with fresh, and only a couple gallons, in case you have to drop the tank.
Lots of good advice here. My first thought was a fuel delivery problem, but too tight valves are also a possibility. Does it have an adjustable valvetrain?
 
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Can of worms.gif
 
Texas97 said:
reading back on the C bodies site, the step dad retards the timing then he advances it and yall have swapped carbs several times, and then there is a fire in the carb, then it runs great last november, and you pull it out and it runs awful?
Click to expand...

Yeah, pretty much
 
66ChargerHI-PO said:
Not the car no, but the engine if we can’t get it right then yes because he is fed up with it.
Click to expand...

ok.
vacuum reading at idle?

what is the current base ignition timing?
what is the current total ignition timing?

what is fuel pressure before entering the carb?
 
PRND21 said:
What does the inside of your fuel tank look like? Have you checked the fuel pump pressure when it acts up?
Click to expand...
The fuel tank is new, and we put gas in it last November. We have not checked the pump pressure, we only have the electric pump on to start the engine after its been sitting and we have a high volume mechanical pump otherwise

65CopCar said:
I know there was a place on the Berlin Tpke that sells it. I was looking to get non-ethanol fuel for my mom's stuff.
My mom is calling me to visit again (New Britain). I would be happy to get together and chat about the car. Been doing this a long time with various hp levels
Click to expand...
The turnpike used to sell it, but unfortunately does not anymore. I know exactly where you are talking about, its only 5 minutes from our house. I will PM you on coming over, that would be greatly appreciated if you are willing to
 
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