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Air pocket in block? Did you pretest the thermostat? Drill an 1/8" hole in thermostat? Describe the overheating process for us.

Check your compression on #7 and compare it to the other cylinders.

Do the compression test and then use an IR temperature sensor to measure exhaust temperatures at each cylinder to find the non-firing culprit. You could also do the temperature test first too!

No. I believe it is a casting sequence number.

Love those Demons! They were my very first MOPAR loves. Never saw a 440 though.

Yikes! I hate when I do that!

I like the contrast that factory colors gives me. But to each his own!:cheers:

Aluminum heads are said to allow running one ratio point higher, so an 11:1 CR would react like a 10:1 because of the better heat transfer. Also, dynamic CR counts too.

Either cut holes in the plate or build a stand-off frame that will move the plate about 1" from the face of the radiator fins. The frame should be a simple rectangular piece that keeps all of the air that goes thru the radiator inside the shroud plenum so that the fans pull all the air thru all...

My setup is factory original and there is barely enough space to get a fan belt between the fan and radiator. Never had a blade touch the radiator, but it is the factory rigid fan blade - not the flex fan (which should flex even further away from the radiator under high RPMs). Just saying...

Valve covers, oil pan gaskets, oil gallery plugs without thread sealant, etc... Many places. Clean it up and then inspect closely after your next drive.

I'd snag it if I were you. Besides the heads, you'll probably need a different water pump housing too. It's a 440 dude!!!

I used 13 volts to allow for a mis-adjusted voltage regulator. Batteries with a full charge should normally show 12.5 volts with the engine off. Yes, it should normally be 13.5 volts to 14.5 at the battery terminals with the engine running. BTW, 67Dart273 rocks!

Measure the voltage at the battery terminals while the engine is running. Less than 13 and you have a further problem to track down. Over 13 volts and it's time for a new battery.

As a start, use a spacer between the fan and the water pump toget tHe fan about 1/2" from the radiator! Then install a fan shroud on the radiator.

Doing a lot of burn outs? Going drag racing? If so, then upgrade. If not, then use what you got. You could always just upgrade after you break it.

Great find! Take it all!

Unless you have a bore scope that you could run down the cylinders thru the spark plug holes, you'll need to take the heads off for an inspection. This won't tell you anything about the ring seal, but could show scoring of the walls and possibly the condition of the valves. Definitely do the...

The water pump housing may have the inlet on the wrong side, but this is easy to fix by swapping out the correct sided housing. Go for it! Maybe fix the low compression pistons along the way too!

Are your sure that this increased lift won't cause the valves to strike the pistons? You can use lighter springs to break-in the cam if you want. The heavier springs prevent valve float at higher RPMs. They also put quite a bit more load onto the lifters, cam and pushrods. Break-in muight be...