On a 2004 Ford F-150 , 5.4 L V8 engine :
The engine cylinder locations are numbered :
firewall
4 - 8
3 - 7
2 - 6
1 - 5
front of vehicle > driver
cylinder # 1 is the front cylinder on your straight 6
You cannot convert any 6-cyl engine to a V8, you can only swap them
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P0306 Cylinder 6 Misfire Detected
YES - passenger side of engine , front cylinder
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FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
On a 2004 Ford F-150 ( 4.6 and 5.4 liter V8 engines ) firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
you just replace it
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
A Ford dealership would be the best place to find a master cylinder for a Ford F150. Parts Geek, Parts Train, and eBay also have master cylinders for a Ford F150 for sale.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front ( Ford V8 engine ) also , for the straight 6 cylinder engine , the # 1 cylinder is at the front