some info on a 440

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martin53

martin53
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OK I usually post about a small block I have but I'm looking to purchase a 67 dodge d100 with a 426 that has been bored to a 440. I'm buying the truck for 1000 bucks says trans was rebuilt and runs really good but overheats and his buddys said it was cause it was bored to a 440. It took a little to start and when started I tried to drive and when shifted into drive it just rolled forward. I figured I need to warm the trans fluid a little since it sat for a while. My main question is Why does it overheat and what can I do to fix it.
 
Sometimes they get bored to far and the cylinder walls get thin and create more heat. for 14 ci i would think thats what .060 over maybe. Depending on how thick the block was that shouldnt have over heat effect. But im no expert. Look at the cooling system does it look like its up to snuff or pieced together?
 
The truck had a 318 with a 727 trans he had his mechanic put a bored 440 and they kept the 318 radiator and put an electric fan
 
426 to 440 is .070" over...perhaps it's too much overbored, but the only way to truly tell is to sonic check the cylinders...but there are several other things that can contribute to overheating, as you surely know.

That being said, I'd be inclined to agree with ScampTramp...have the radiator looked at, it may be either too small (not enough cores) or may have blockage. And also as alluded to, the fan may not be pulling enough air...clutch fans and shrouds work wonders...
 
I would sat radiator isn't big enough since was a small block and you defiantly want a fan shroud. They make a big difference by directing air through- not around radiator...
 
martin53 said:
The truck had a 318 with a 727 trans he had his mechanic put a bored 440 and they kept the 318 radiator and put an electric fan
Click to expand...
not enough radiator , not enough carb , thermostat to big or to small
 
Lets not be so fast to assume there's not enough radiator...I know it's a different year model, but my Dad's Ramcharger has a 318 in it...that thing came with a 3 core radiator and plenty capacity to cool a big block...but if it hasn't been serviced in a while or well kept, it may just not be flowing well enough. With the electric fan, it may not be pulling enough air through the fins. T-stat...unless it's not opening all the way or a really hot one, less likely. Carb...I can't say I follow your logic here unless it's running slobbering rich and very retarded timing-which could also be at fault.

We really need some more info from the OP...

What say ye, Sir?
 
I know we're trying to help you solve multiple issues here, so next:

The trans not going anywhere might just be low on fluid. If the engine is recently installed, where did the trans come from? Was it working before? Have you checked the level on it?

Just like with the overheating, need some more info...
 
The guy I bought it from said it ran perfect and that it would only overheat on hot day but other than that he never drove it cause of gas prices. Its been sitting a while. Its sitting at his house I finally got it started yesterday put some gas and had to tap on the carb a little for it to work. I should have let it warm up a while but wife wanted to head home. When trying to drive forward it just reved and rolled a little when in reverse it drove fine. I checked the trans fluid and looked clean and didn't smell burnt. I was not warm at all so I'll let it run a little before I drive it next time. The truck originally had a 318 with a727 torque flight . The big block 440 was from a 68 charger. Say the trans was rebuilt and has the reciet. Engine has a holley double pumper
 
Do any of you guys question if it is actually 440ci? I do..
 
426-440, symantics. its 14 inches. Getting back to the problem at hand. the acc pumps on the carb, are they good, move the linkage by hand while looking down the bore of the carbs without the engine running, it should squirt immediantly, no lag, should be about a papers width clearance between the pump linkage and pump arm. trans sounds low on fluid. idle truck for a few minutes and put in D, have helper check dipstick and fill to mid bewteen h and cold. if it still doesnt drive, check Low. auto trans guys will tell you L and D are off different circuits so maybe you got some bad clutches. buddy had a 383 that would overheat, turned out to be a head gasket, he would lose water though. Radiators are not that expensive, but a 318 rad will idle that motor all day. might just need a shroud and a rod out. .070 over on a 440 is thin.
 
Thanks a lot I'm gonna haul it home today hopefully to work on it some more and check to see what the block says and get back to you guys
 
...I'm thinking that really won't say much.

ScampTramp called it...you'll need to crawl up under the driver side and see what's on the drivers side of the block right below the deck to head mating surface...or use a mirror to see it from the top.
 
Confused. What is overheating the tranny or the motor? The original truck rad is twice the rad they put in cars. Still could need a cleaning but as was said- it will do the job. Is it an old big block 426 bored to 440 or is it a 440 out of a 68 charger. Or are you saying you have a 68 charger 426 hemi bored 60 over?
The 426 pick ups were a mid 60s option and very few were built. I remember 383 as the big motor in the 67 p/u and most of those were the 3/4 ton.
As everyone says- probably you are low on fluid- maybe wrong dipstick, or bands are out of adj or fried.
 
maybe just mine, but seems like all my 440's ran a little on the warm side.... how hot does it get? goin down the road? or parked after a run? when rebuilt you have to assume it was hottanked and all the water passgaes got cleaned out rust and crap? I say lets spend YOUR $$ and drag it home>>>
 
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