I'm looking to rebuild a 390 for my truck. It's a 1977 F-150 and currently has a 360 in it.

I looked at a 390 today and couldn't find a sequence of numbers on the block longer than like 4 or 5 characters. Where would I be able to find the block casting numbers? I believe it to be a 1976 390?

First, here is some information that I found. Second, here are the numbers that I got and their locations, let me know if there's any signifigance to them, thanks:

105 is reversed. It's located on the bottom right of the drivers side.

D4TE is upside down on the passenger side of the block up front as well.

I also found the number 13 with an upside down "W" next to it, and the W was upside down on top of what looked like a copyright symbol, but i don't think the circle surrounding the C was complete. It's hard to describe, but it helps to try and draw it out. This was located on the driver side front, upside down in between the first and second exhaust manifold ports. This mark is also on the water pump and intake manifold.

On the driverside valve cover, it had the original sticker for the motor that had this number: D6TE-9C485-BHA.

The oil filter is on a 90 degree angle (horizontal) to the block on the driver side.

On the carb, there is a tag that has this number: D5TEATA B 5K 21

The spark plug size: BRF42
Gap: .42 - .46

On the back side of the intake is the number: D5TE-9425-KB

I hope that this information can help one of you guys help me to figure out what this motor is and if it's anything special becasue of the reversed numbers. The guy told me that it means it could be bored to a 428, that it has thicker cylinder walls.

Thanks to all who respond, everything is taken into consideration.

 

The reverse "105" blocks are just normal FE and FT blocks cast at MCC after the DIF foundry closed. Some do have thicker walls that permit a 4.13 bore but most are just good std 390/360 blocks. Best thing to do is check the stroke of the engine and if the owner permits remove a head and measure the cyl bore. It sounds pretty original from the numbers posted. You can drill bit test the cyl wall cores to see if there are thicker walls and will support a 428 bore. This means you need to remove the blocks freeze plugs to check.