440 Stroker Engine Problems In A 1967 Plymouth Fury
 

Hi All,

I am wondering if anyone has any tips and or advice for my stepfather for his '67 Fury II with a 440 Stroker engine. The engine was built years ago by a well known high performance Mopar engine builder. We swapped out 3 carburetors and ignition modules and the car now has a Demon carb. We have TTI headers that came with the exhaust kit on it. When the car is cold, it runs like a bat out of hell. It can do burnouts and runs pretty good. But when it gets hot, it does not want to run, and when it's at a stoplight it stalls. mind you We just honed the pistons. My stepfather mostly uses Edelbrock, so the intake got changed from a performer to a regular rpm. Mind you he put an aluminum radiator and electric fans in it too. He did a compression test and checked parts of the engine, and he thinks everything looks fine, everything is new. Since he got so disgusted with it, he just stopped working on it. Now it just sits and collects dust. Since he did a resto, he drove it a little over 200 miles. We took the car out yesterday and it still doing the same thing before we honed the pistons and now pings too. At this point this stroker engine will be taken out and a stock 440 will be put in, but I figured I would ask you fine folks to see if we can do anything to salvage this engine before we take it out. PLEASE HELP, it would be much appreciated.


We did "call in the big guns", and had a specialist/good friend/Mopar mechanic and guru,he suggested the same thing with honing the pistons, we honed them out .003" each, and that unfortunately still did not work. It acts like it has vapor lock but it has a phenolic carburetor spacer and a phenolic 750 cfm Demon carb on it, it has a ballast on it, 440 source heads with no crossover, and an electric fuel pump to boost the mechanical one and that still did not work. The starter works ok when it stalls and we go to start it back up, and sometimes the engine turns fast sometimes it does not. The engine valve lash temp was set by the engine builder

Before giving an opinion I would like to know what is the ignition timing, initial and mechanical, are you using vacuum advance and is it connected to ported vacuum? What is the manifold vacuum at idle and under power both hot and cold.

If I have a engine stalling hot at idle I make sure the choke is open and squirt some gas in the carb, if it speeds up I know it has lean idle mixture.

SF -

Are you sure the engine is the problem?
Probably is, but fuel starvation can happen from any point on the delivery system (from tank to carb), too much heat under the hood can upset a new (tight) engine, and even flaky electricals leading to the engine.
Could be something as silly as the wrong carb tune.
When it does stall, how long does it take to restart?

There was a recent thread, that asked about a similar condition, and the OP didn't realize the the choke wasn't opening.
Just sayin'

Archer

It is not always the same and varies

SF -

IIRC, the Demons are basically Holley knockoffs, so when it dies, is there any fuel left in the bowls?
IOWs, when it's dead, and you manually operate the throttle, does anything squirt out into the venturies???

Archer

Timing or fuel, try 34°total without the vacuum advance plugged in look at the jets and tell us what is in the carb.

Hi All,

Not to say it out loud but I think we maybe getting somewhere with the '67 Fury 440 stroker engine, I got a bigger update than usual. As I mentioned in my last post, we bought an MSD Blaster II coil and a new HiRev 7500 brain from Mr. Erenberg that a friend recommended. We put the Blaster coil and MSD ballast resistor in, then we WERE going to put in the Erenburg brain BUT we read the instructions first. Good thing we did too, as the brain was not compatible with the MSD coil. According to the instructions the brain needed to be run with a stock coil, so that said we took the MSD coil out BUT left the ballast resistor in then put the brain in.

NOW, we start the car and let it run for about 20 to 25 minutes and it ran very good. Better than it normally does to be honest. We put it in gear while the car was sitting in the garage and normally it dies BUT it didn't this time, which was a good sign. We did this about 2 maybe 3 times and still no stalling. So NOW we take it out for a test drive in the evening when it was cooler out than during the day, we took it to get gas and back home which was about a 10-15 minute drive going and coming back and it ran flawlessly with no stalling. We let it sit at the gas station while we filled it up and let it heat soak, it started right back up with no issue. We are not out of the woods yet though, the true test will be taking it out during a hot 85-90% day and seeing what it does but for now things are looking up for this car.

Sounds like Good Progress !!!! :)

wow this is suuuuuuuuuch good news! :)