Monday, September 15, 2025

Replacing the 351W in the '68 Mustang Part 6

Re-installing parts on the engine was pretty much complete last time out. This weekend I kicked off with the fluids: the coolant, engine oil and transmission fluid were all refilled, and I put a couple of gallons of gasoline in the tank. I had to put the car back on the ground before I could add the engine oil, and I installed the drivers side valve cover too; it much easier to add the oil when there is somewhere to place a funnel:

Time to prime the engine. To do this I used a 5/16" socket on the end of a fifteen (15) inch extension chucked into a cordless drill. It is important to run the drill in reverse; you can hear the drill in the video. (Note: I have a extra robust 5/16" oil pump shaft; the stock size is 1/4").


After proving I have oil pressure, something that was sadly lacking in the old motor, I installed the passenger side valve cover, the distributor, and connected the spark plug wires. I have this post-it note taped to the lid of my toolbox so I can easily look up the firing order for the 351W. If I was a proper "car guy" I would have either learned this by heart or had it tattooed somewhere.


I'll be replacing the cable ties with something more visually appealing in the future:


The first attempt to start the engine was not successful - gas was actually squirting out of the rear breather hole at the carburetor (see arrow below). This indicates that the float is too high. 


After some back and forth adjusting the carb settings and mopping up gasoline from on top of the intake manifold, this was the result: 


A couple of pictures of the engine without the air cleaner:



To be continued....

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