FOUND A 390 4V ??
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From: POUCE COUPE BC
FOUND A 390 4V ??
I found a 390 at an auto wrecker and it has a backwards 502 and 10 stamped into the block. I has the oil pan sump at the back of the engine and a 4 barrel carb and cast iron intake. Any idea if its a 4v or what year it is ?
Ford Parts Specialist
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From: Simi Valley, CA
390 was available with optional 4V 1974/76 F100/350. The 4th digit of the VIN will be an M (390 4V).
But, as I've told you twice in your other threads, the 360 and 390 share the same engine block, the bore is the same (4.05"). So whatever codes or casting numbers you find, apply to both.
Plus, people have swapped 390 4V manifolds and carbs from cars onto trucks that originally were 352 2V's, 360 2V's and 390 2V's.
Since all FE engines look identical, the only way to determine the engine size is by measuring the stroke.
But, as I've told you twice in your other threads, the 360 and 390 share the same engine block, the bore is the same (4.05"). So whatever codes or casting numbers you find, apply to both.
Plus, people have swapped 390 4V manifolds and carbs from cars onto trucks that originally were 352 2V's, 360 2V's and 390 2V's.
Since all FE engines look identical, the only way to determine the engine size is by measuring the stroke.
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These days: "4V" = four valves per cylinder.
Old days: "4V" = 4 bbl carb. (Four VENTURI carb)
If you found a truck 390, don't get too excited. It is the basis for a very powerful rebuild, as is your 360. As stock, both the 360 and 390 got pistons that are over .100 down the hole, with compression barely in the 8s.
That and the mild cams make them real yawners compared to prior years performance engines.
They run forever, and pull loads without complaint, other than wanting more gas, but that's why Ford built them that way.
Old days: "4V" = 4 bbl carb. (Four VENTURI carb)
If you found a truck 390, don't get too excited. It is the basis for a very powerful rebuild, as is your 360. As stock, both the 360 and 390 got pistons that are over .100 down the hole, with compression barely in the 8s.
That and the mild cams make them real yawners compared to prior years performance engines.
They run forever, and pull loads without complaint, other than wanting more gas, but that's why Ford built them that way.
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From: POUCE COUPE BC
I believe its a 4v 390. I will measure the stroke. The oil pan is a car oil pan and has a 4 barrel carb on it. I will freshen it up and possibly turbo charge it. The turbo will go on 360 first to dial it in before 390 goes in.
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From: POUCE COUPE BC
Ok good to know !
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From: POUCE COUPE BC
looks like 70s block and 68 heads. Was it pistons or heads that gave the 4v a higher compression ratio than the 2v ?
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From: POUCE COUPE BC
Also the oil pan has the sump at the back of the engine instead of the front. They must be interchangeable as far as oil pump location ?
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In pickup motors, Ford used the 410 piston in 2 and 4 bbl, and the pistons sit .100 or better down the hole.
Sounds like that motor has been gone through. '68 heads did not have hardened seats. Who knows what piston is in it.
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From: POUCE COUPE BC
Exactly, I will try to do a compression test before I do anything. I think I could feel valve reliefs in the piston when I measured the stroke. I dont know if its a dished piston or not. Time will tell lol.
Cargo Master
Joined: Apr 2004
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From: Golden, CO
The rear sump pan is specific to the 4x4 trucks.
Since it sounds like you already bought the engine, pull the pan and look for numbers on the second counterweight. Once you ID the crank, you will know the stroke.
Since it sounds like you already bought the engine, pull the pan and look for numbers on the second counterweight. Once you ID the crank, you will know the stroke.
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