Engine Size
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Junior User
Joined: Dec 2010
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Engine Size
I have a dilema that you all can propbably help with. The PO I bought my truck from told me it was a 1978 with a 390 swapped into it. Now when I did some VIN decoding it appears to be the 1979 F150 that originally came with the 400. I am unsure hjow to tell just by looking if I have the 400 or 390 but need to know before I buy parts. Any advice would be appreciated. 
Mountain Pass
Joined: May 2006
Posts: 173
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A few of easy ways: count the valve cover bolts, 360-390 has 5 per head (3 on top, 2 on bottom), 351M-400 have 8 per head, (4 each, top & bottom).
Or look at the fuel pump, 360-390 has 2 horizontal mounting bolts, bolted to aluminum timing cover, 351M-400 has 2 vertical bolts, directly to block, has flat steel timing cover.
Look at the oil filter, 351M-400 screws directly onto the block, 360-390 has an aluminum oil filter adapter between the block & oil filter.
Look at the distributor, 360-390 goes thru the intake manifold, 351M-400 fits into the block, ahead of the intake manifold.
Check water pump, 360-390 water pump is held on with 4 bolts, 2 per side, and there is a short piece of 5/8" heater hose between the water pump & intake manifold, plus the pump sticks out in front of the aluminum timing cover, on a 351M-400, the water pump is held on with many more bolts, directly to the timing cover.
One of these just has to help you decide what you have.
Or look at the fuel pump, 360-390 has 2 horizontal mounting bolts, bolted to aluminum timing cover, 351M-400 has 2 vertical bolts, directly to block, has flat steel timing cover.
Look at the oil filter, 351M-400 screws directly onto the block, 360-390 has an aluminum oil filter adapter between the block & oil filter.
Look at the distributor, 360-390 goes thru the intake manifold, 351M-400 fits into the block, ahead of the intake manifold.
Check water pump, 360-390 water pump is held on with 4 bolts, 2 per side, and there is a short piece of 5/8" heater hose between the water pump & intake manifold, plus the pump sticks out in front of the aluminum timing cover, on a 351M-400, the water pump is held on with many more bolts, directly to the timing cover.
One of these just has to help you decide what you have.
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Junior User
Joined: Dec 2010
Posts: 59
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It appears that I have the 400. I am seriously wondering about whether there was a rebuild or not. I know she starts right up everytime and runs like a champ. I thank you all for all the tiips. I have been out of the auto game for a few years and this is my first old Ford so still on a learning curve.
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