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Ford guys... O2 Placement

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Old 10-27-2025 | 11:47 PM
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Default Ford guys... O2 Placement

I'm finishing up installing my engine and wiring up my mustang. Going with MPFI Holley EFI.
Any preference on which bank to monitor? 1-4 or 5-8 or doesn't matter.
Thanks!
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Old 10-28-2025 | 07:59 AM
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it shouldnt matter as it is just taking an average of 4 cylinders to decide what to do. the reason that oem went to two is that the early systems with just one did not show a problem if the failure was on the other bank and the early systems were terrible as to electronic quality.
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Old 10-28-2025 | 08:11 AM
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What fuel rails and how are you feeding them?
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Old 10-28-2025 | 10:36 AM
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Originally Posted by underpsi68
What fuel rails and how are you feeding them?
Aluminum -6AN fuel rails, Seimens Deka 42lb injectors, currently going to fire it off stock pump, but will be installing Aeromotive 340 this winter.
Not an all out build, just for putting around. I haven't had the car on the road since 2003. 1987 T-Top car.
I just pulled the K-member and welded new boxes, new Strange +10 adj, struts
Stock block
DSS +0.030" pistons
Ported Promaxx 180 heads
9.8:1
Comp XE 274 cam
Holley EFI
https://siemensdeka.com/product/42lb...-fi11420-48mm/
https://aeromotiveinc.com/products/3...QhKP7H7e4LD-Kd

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Old 10-28-2025 | 11:07 AM
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Old 10-28-2025 | 11:19 AM
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New off road H pipe is pre-welded with bungs for each bank. I am only monitoring 1.
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Old 10-28-2025 | 11:29 AM
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I installed mine on the drivers side back. I thought I remember reading in the instructions to put it in the drivers side bank.
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