1986 inline 6 engine replacement
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8th Gear
Joined: Mar 2024
Posts: 8
Likes: 1
From: Ohio
1986 inline 6 engine replacement
Hi all,
im new here. Have an 86 f150 with a cracked piston in cylinder 3. (Carbureted). Mechanic says it can’t be rebuilt. I’m having trouble finding a replacement engine from the re- manufacturers. Been searching for about 2 months now. ATK said they had one but it turns out it was not the correct type of 300. Any ideas where I can locate something compatible? Thanks
im new here. Have an 86 f150 with a cracked piston in cylinder 3. (Carbureted). Mechanic says it can’t be rebuilt. I’m having trouble finding a replacement engine from the re- manufacturers. Been searching for about 2 months now. ATK said they had one but it turns out it was not the correct type of 300. Any ideas where I can locate something compatible? Thanks
Laughing Gas
Joined: Sep 2016
Posts: 774
Likes: 104
From: Elk Grove Village, IL
Hi all,
im new here. Have an 86 f150 with a cracked piston in cylinder 3. (Carbureted). Mechanic says it can’t be rebuilt. I’m having trouble finding a replacement engine from the re- manufacturers. Been searching for about 2 months now. ATK said they had one but it turns out it was not the correct type of 300. Any ideas where I can locate something compatible? Thanks
im new here. Have an 86 f150 with a cracked piston in cylinder 3. (Carbureted). Mechanic says it can’t be rebuilt. I’m having trouble finding a replacement engine from the re- manufacturers. Been searching for about 2 months now. ATK said they had one but it turns out it was not the correct type of 300. Any ideas where I can locate something compatible? Thanks
If Cylinder #3's only issue is a cracked piston, I see no reason why that engine cannot be rebuilt. Now, if the cylinder wall is scored so deeply that is can't be bored, then maybe I can see it becoming a parts source. There are lots of these engines that are available to be rebuilt. Heck, I bought a running one for $500. I think you might want to get a second opinion on that engine or go shopping for a good running one out of a similar year truck.
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,123
From: Angier, NC
Yes welcome to FTE
So why would not the ATK 300 motor work?
The only reason I can see is if it was a 87-92 EFI motor as they done have a fuel pump opening for the pump.
Everything else will work and you could run a electric fuel pump with out too much issues.
Also as said a junk yard motor that could be rebuilt.
Again it would most likely be a EFI motor but being it is going to get rebuilt have the shop open the hole for the pump, told bolt holes are already there.
On your motor with bad piston if the wall is banged up you could sleeve it.
Thing is it could run more than just rebuild a junk year motor.
Dave ----
So why would not the ATK 300 motor work?
The only reason I can see is if it was a 87-92 EFI motor as they done have a fuel pump opening for the pump.
Everything else will work and you could run a electric fuel pump with out too much issues.
Also as said a junk yard motor that could be rebuilt.
Again it would most likely be a EFI motor but being it is going to get rebuilt have the shop open the hole for the pump, told bolt holes are already there.
On your motor with bad piston if the wall is banged up you could sleeve it.
Thing is it could run more than just rebuild a junk year motor.
Dave ----
Thread Starter
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8th Gear
Joined: Mar 2024
Posts: 8
Likes: 1
From: Ohio
86 crate engine
Yes welcome to FTE
So why would not the ATK 300 motor work?
The only reason I can see is if it was a 87-92 EFI motor as they done have a fuel pump opening for the pump.
Everything else will work and you could run a electric fuel pump with out too much issues.
Also as said a junk yard motor that could be rebuilt.
Again it would most likely be a EFI motor but being it is going to get rebuilt have the shop open the hole for the pump, told bolt holes are already there.
On your motor with bad piston if the wall is banged up you could sleeve it.
Thing is it could run more than just rebuild a junk year motor.
Dave ----
So why would not the ATK 300 motor work?
The only reason I can see is if it was a 87-92 EFI motor as they done have a fuel pump opening for the pump.
Everything else will work and you could run a electric fuel pump with out too much issues.
Also as said a junk yard motor that could be rebuilt.
Again it would most likely be a EFI motor but being it is going to get rebuilt have the shop open the hole for the pump, told bolt holes are already there.
On your motor with bad piston if the wall is banged up you could sleeve it.
Thing is it could run more than just rebuild a junk year motor.
Dave ----
5th Wheeling
Joined: Mar 2023
Posts: 26
Likes: 2
Thanks Dave! My understanding is that the 85 n&86's had a different head compared to all the other 300's. There are 2 different part numbers for each engine on ATK's (and NAPA's) site. Of course the one that supposedly fits the 86 that I have are unavailable. Didn't know if the other one was useable. Is it head & ehhaust differences, or Block difference too?
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,123
From: Angier, NC
Because of the head chamber shapes it may lead to pinging at a lower timing setting.
Now if you were replacing the motor in a EFI truck the EFI heads have thing 2 more manifold bolts as the EFI is so large and heavy it needs them.
But using the EFI head with the old log manifolds you just dont use them 2 bolts.
Dave ----
More Turbo
Joined: Nov 2015
Posts: 715
Likes: 112
Thanks Dave! My understanding is that the 85 n&86's had a different head compared to all the other 300's. There are 2 different part numbers for each engine on ATK's (and NAPA's) site. Of course the one that supposedly fits the 86 that I have are unavailable. Didn't know if the other one was useable. Is it head & ehhaust differences, or Block difference too?
The 85 and 86 heads have the same 76cc open combustion chambers as the earlier heads meaning you can use any of the 65 to 84 engines as a direct replacement engine.
The 1987 and later engines are EFI and the heads have a high swirl combustion chamber that requires a totaly different ignition timing curve than the earlier engines.
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bill777
1987 - 1996 F150 & Larger F-Series Trucks
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Dec 2, 2007 06:11 PM
