Need help with 318 poly combination!!!
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Need help with 318 poly combination!!!
My dad owns a '64 Dodge Dart that has had quite a bit of money and work put into it. I know the car has way more potential than it has shown us. It's got the poly 318 block in it and is 90 over, so somewhere around a 333 cu. in. motor. He has dual holley 600's and tunnel ram right now and the motor just ***** out after anything over like half throttle. Does anyone know if this is a completely wrong carb/intake setup for it? Would it do better with a single 4 barrel setup? It really hauls *** and is only running about half it's potential i believe. Anyone know much about this issue? There is a lot to list as far as aftermarket parts, so I can get more into detail if anyone wants to take a shot at it (that knows quite a bit on this subject).
Mopar Lover
Joined: Mar 2009
Posts: 837
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From: Springfield NE
how did he fit the "poly" in the 64 dart. any way, yes that is too much carb and intake for a poly. Wait a minute, are you sure this is a poly. I've never heard of a tunnel ram for a poly motor. Dual carbs yes, dual carbs on a tunnel ram, no. If you did have a poly with a tunnel ram and two 600 cfm carbs, it would be too much. Poly heads dont flow all that well, particularly on the exhaust side.
Mopar Lover
Joined: Apr 2011
Posts: 4,282
Likes: 388
Unless it is older, maybe 60-62 Dart IT would not have a poly from the factory. 63 started the A body Dart. Factory V8 for a 64 Dart would have been the first of the 273 LA motors..
Even the early 60's would be a cool car, make sure what you have before deciding what to do with it..
Post a picture..
Even the early 60's would be a cool car, make sure what you have before deciding what to do with it..
Post a picture..
Mopar Lover
Joined: Nov 2007
Posts: 2,424
Likes: 248
I have "heard" of Poly engines installed by people in Darts, so it's not impossible, just not original
We need to see some photos of it!!!!
So far as the problem, probably either ignition or fuel
Go over the ignition from stem to stern. REPLACE the plugs with new.
TEST the wires AND coil wire. Use an ohmeter, clip it to each end, and shake the wires to show up intermittent connections. The resistance will depend on what sort of wires you have, the big thing is that they all show about the same.
Examine the cap and rotor for damage, if any question, replace both.
If it has points/ condenser, replace them. If possible, round up someone with an igntition scope and see what the spark looks like
For fuel, there are specs in the shop manuals for checking pump pressure and volume. If you have an electric pump, l figure out what the model is and Google up the manufacturer's website for the volume specs on it.
Inspect or change any rubber jumper hose in the fuel system. There's one back at the tank, and one up at the mechanical pump if used. These get old and can collapse under pump suction
Also suspect the strainer in the tank. You can remove the fuel cap and blow air back through the supply line and get a feel for "if it is clear."
If none of this brings results, "rig" a safe but temporary fuel pressure gauge on the pump output. Go for a test drive(s) and watch for fuel pressure drop under hard acceleration.
Has the car been in long term storage? What shape do you think the carbs are in? Could they be gummed up with old fuel and varnish? The internal metering ports, jets, etc, of the carb could be AFU
We need to see some photos of it!!!!
So far as the problem, probably either ignition or fuel
Go over the ignition from stem to stern. REPLACE the plugs with new.
TEST the wires AND coil wire. Use an ohmeter, clip it to each end, and shake the wires to show up intermittent connections. The resistance will depend on what sort of wires you have, the big thing is that they all show about the same.
Examine the cap and rotor for damage, if any question, replace both.
If it has points/ condenser, replace them. If possible, round up someone with an igntition scope and see what the spark looks like
For fuel, there are specs in the shop manuals for checking pump pressure and volume. If you have an electric pump, l figure out what the model is and Google up the manufacturer's website for the volume specs on it.
Inspect or change any rubber jumper hose in the fuel system. There's one back at the tank, and one up at the mechanical pump if used. These get old and can collapse under pump suction
Also suspect the strainer in the tank. You can remove the fuel cap and blow air back through the supply line and get a feel for "if it is clear."
If none of this brings results, "rig" a safe but temporary fuel pressure gauge on the pump output. Go for a test drive(s) and watch for fuel pressure drop under hard acceleration.
Has the car been in long term storage? What shape do you think the carbs are in? Could they be gummed up with old fuel and varnish? The internal metering ports, jets, etc, of the carb could be AFU
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