1986 F-250 Progress Thread
Post Fiend
Joined: Nov 2011
Posts: 8,908
Likes: 1
From: Algona, Washington
I'm Glad you guys like it 
I try. And yeah, I'm 20 now. I would totally go fetch my casting numbers if I wasn't so lazy and knew where everything was. But that's life. Hopefully you figure out what was up with the motor.
I try. And yeah, I'm 20 now. I would totally go fetch my casting numbers if I wasn't so lazy and knew where everything was. But that's life. Hopefully you figure out what was up with the motor.
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Logistics Pro
Joined: Sep 2011
Posts: 4,491
Likes: 26
From: Algona,WA
I sure hope so too, I asked NumberDummy if he could help me out with the extra F next to FA4 to see if it's a production engine or a service replacement engine or not.
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Logistics Pro
Joined: Sep 2011
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From: Algona,WA
SO I hauled over 2000 pounds with the truck today, drove and rode really nice with all that weight back there. Ran pretty good but it still sounds retarded and like it's getting too much fuel, I had at the last second screwed the regulator back in for more fuel flow and pressure since at the time it ran like crap when it was warming up, it was just the carb icing up lol. But where I have it at is probably 8-9 PSI, it seemed better than it did with no regulator. I bought a Tee fitting so I can test the fuel pressure the right way tomorrow.
Oh yeah, I had to move the truck after 20 minutes of sitting in the driveway unloading pellets, I un hooked the vacuum advance and on re start there was no ping, looks like I gotta back the vacuum advance back down a little bit.
Oh yeah, I had to move the truck after 20 minutes of sitting in the driveway unloading pellets, I un hooked the vacuum advance and on re start there was no ping, looks like I gotta back the vacuum advance back down a little bit.
Post Fiend
Joined: Nov 2011
Posts: 8,908
Likes: 1
From: Algona, Washington
This is the left side if you are infront of it.
Off to the right is where the advanced is, It seems to be a very slightly weaker vacuum pull than the other side but both increase as the throttle increases. They both also have virtually no vacuum when the truck is idling. Which seems appropriate since the throttle plates are in the way.
In the case of the choke vacuum, it was the only place that made sense to me, when I got it, there was no choke vacuum nor was it even hooked up using the heating wire.
BTW, sorry matt for the hijacking
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Logistics Pro
Joined: Sep 2011
Posts: 4,491
Likes: 26
From: Algona,WA
I've got it hooked to ported vacuum. It will only ping if I start it and my foot is on the throttle to get it re started, if I restart it and it happens to start without me touching the gas it doesn't ping.
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Logistics Pro
Joined: Sep 2011
Posts: 4,491
Likes: 26
From: Algona,WA
Wait above? Would the same apply to my 351M with a carter AFB carb? Mine is on the lower driverside vacuum port.
This is the left side if you are infront of it.
Off to the right is where the advanced is, It seems to be a very slightly weaker vacuum pull than the other side but both increase as the throttle increases. They both also have virtually no vacuum when the truck is idling. Which seems appropriate since the throttle plates are in the way.
In the case of the choke vacuum, it was the only place that made sense to me, when I got it, there was no choke vacuum nor was it even hooked up using the heating wire.
BTW, sorry matt for the hijacking
This is the left side if you are infront of it.
Off to the right is where the advanced is, It seems to be a very slightly weaker vacuum pull than the other side but both increase as the throttle increases. They both also have virtually no vacuum when the truck is idling. Which seems appropriate since the throttle plates are in the way.
In the case of the choke vacuum, it was the only place that made sense to me, when I got it, there was no choke vacuum nor was it even hooked up using the heating wire.
BTW, sorry matt for the hijacking
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Post Fiend
Joined: Nov 2011
Posts: 8,908
Likes: 1
From: Algona, Washington
You know, I will have to read it when I am not tired. I recently have been learning a lot about the 351M/400 cooling system, and how I bought the entirely wrong thermostat for it.... Learning a little about the vacuum for this carb would be nice.
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Logistics Pro
Joined: Sep 2011
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From: Algona,WA
Gary has a 351M, ask him about what he did with the thermostat. I have no clue what he did there. Probably just has a regular thermostat. But I'm not sure.
Post Fiend
Joined: Nov 2011
Posts: 8,908
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From: Algona, Washington
Well apparently there is a bypass waterway to the back 2 cylinders of each side. All this is for (so my understanding) is to warm up the water heater faster and help with emissions. The RobertShaw 333 - 180 has an extra blocker on the bottom so when the t-stat opens it blocks that bypass off and redirects the coolant back through the rad to cool it down. It was a little rough trying to understand it but I think I pretty much got it. That is also the cause of so many 351's overheating, blowing gaskets, burning up heads and valves and stuff. The rear 2 cylinders end up getting way too hot.
Old School Hot Rodder
Joined: Feb 2006
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From: Exmore, VA
A couple of items, on the Carter AFB/Edelbrock 4 barrels, the vacuum advance port is the one that "tips in" first, or as was mentioned in post #96 by GruesomeJeans. The one with the weaker vacuum would be the EGR or canister purge or both as needed.
The Thermostat used on 351C, 351M and 400 engines is different from the one 300, 302, 351W, FE and 460 use due to the bypass passage under it. The bypass is internal on these engines (the 300 doesn't have one) rather that the external hose (the ones on the FE and 460 are a royal PITA to replace unless the water pump is off). The thermostat for the 351C,351M and 400 has an additional "plate" for lack of a better term that closes this bypass hole as the thermostat opens to direct all the flow other than heater core through the radiator. FWIW, the mod motors have the same style thermostat. GruesomeJeans pretty well described it.
The Thermostat used on 351C, 351M and 400 engines is different from the one 300, 302, 351W, FE and 460 use due to the bypass passage under it. The bypass is internal on these engines (the 300 doesn't have one) rather that the external hose (the ones on the FE and 460 are a royal PITA to replace unless the water pump is off). The thermostat for the 351C,351M and 400 has an additional "plate" for lack of a better term that closes this bypass hole as the thermostat opens to direct all the flow other than heater core through the radiator. FWIW, the mod motors have the same style thermostat. GruesomeJeans pretty well described it.
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Wait above? Would the same apply to my 351M with a carter AFB carb? Mine is on the lower driverside vacuum port.
Off to the right is where the advanced is, It seems to be a very slightly weaker vacuum pull than the other side but both increase as the throttle increases. They both also have virtually no vacuum when the truck is idling. Which seems appropriate since the throttle plates are in the way.
In the case of the choke vacuum, it was the only place that made sense to me, when I got it, there was no choke vacuum nor was it even hooked up using the heating wire.
BTW, sorry matt for the hijacking
Off to the right is where the advanced is, It seems to be a very slightly weaker vacuum pull than the other side but both increase as the throttle increases. They both also have virtually no vacuum when the truck is idling. Which seems appropriate since the throttle plates are in the way.
In the case of the choke vacuum, it was the only place that made sense to me, when I got it, there was no choke vacuum nor was it even hooked up using the heating wire.
BTW, sorry matt for the hijacking
A couple of items, on the Carter AFB/Edelbrock 4 barrels, the vacuum advance port is the one that "tips in" first, or as was mentioned in post #96 by GruesomeJeans. The one with the weaker vacuum would be the EGR or canister purge or both as needed.
The Thermostat used on 351C, 351M and 400 engines is different from the one 300, 302, 351W, FE and 460 use due to the bypass passage under it. The bypass is internal on these engines (the 300 doesn't have one) rather that the external hose (the ones on the FE and 460 are a royal PITA to replace unless the water pump is off). The thermostat for the 351C,351M and 400 has an additional "plate" for lack of a better term that closes this bypass hole as the thermostat opens to direct all the flow other than heater core through the radiator. FWIW, the mod motors have the same style thermostat. GruesomeJeans pretty well described it.
The Thermostat used on 351C, 351M and 400 engines is different from the one 300, 302, 351W, FE and 460 use due to the bypass passage under it. The bypass is internal on these engines (the 300 doesn't have one) rather that the external hose (the ones on the FE and 460 are a royal PITA to replace unless the water pump is off). The thermostat for the 351C,351M and 400 has an additional "plate" for lack of a better term that closes this bypass hole as the thermostat opens to direct all the flow other than heater core through the radiator. FWIW, the mod motors have the same style thermostat. GruesomeJeans pretty well described it.
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FTE Legend
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From: Northeast, OK