390 crank pulley interchangability?
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5th Wheeling
Joined: Sep 2018
Posts: 40
Likes: 2
390 crank pulley interchangability?
Hello all -
With nice weather this week I'm finally diving in to tuning up the 1974 F250 390 4bbl (vin code M) I picked up last September. The truck is auto, with factory air and power steering.
While setting the timing I noticed that the front pulley is bent, bad enough to be noticeably visible when the engine is idling. The balancer doesn't wobble, but the pulley does. The pulley on the truck is stamped D3TE-6312-A. I picked up another pulley at the salvage yard from a 1972 F100 that had an FE in it, the salvage yard pulley is stamped C9TE-6312-A. At first glance they are identical; same height, same diameter, same groove spacing. The only difference I can see is that the two inner grooves on the salvage yard pulley seem to come to a sharper V at the bottom than the ones on my original pulley.
I know there are some fantastically knowledgeable folks on here, are these two pulleys reasonably interchangeable or should I keep looking for one with the same stamping?
Thanks!
With nice weather this week I'm finally diving in to tuning up the 1974 F250 390 4bbl (vin code M) I picked up last September. The truck is auto, with factory air and power steering.
While setting the timing I noticed that the front pulley is bent, bad enough to be noticeably visible when the engine is idling. The balancer doesn't wobble, but the pulley does. The pulley on the truck is stamped D3TE-6312-A. I picked up another pulley at the salvage yard from a 1972 F100 that had an FE in it, the salvage yard pulley is stamped C9TE-6312-A. At first glance they are identical; same height, same diameter, same groove spacing. The only difference I can see is that the two inner grooves on the salvage yard pulley seem to come to a sharper V at the bottom than the ones on my original pulley.
I know there are some fantastically knowledgeable folks on here, are these two pulleys reasonably interchangeable or should I keep looking for one with the same stamping?
Thanks!
Thread Starter
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5th Wheeling
Joined: Sep 2018
Posts: 40
Likes: 2
Got it all bolted together and the 1972 pulley bound up tight against my 1974 water pump pulley. Fortunately, I had the presence of mind to get the 1972 water pump pulley from the junkyard, and it fits but just barely. There is room to slide a piece of paper between the two, but not enough to slide a credit card. I thought they were the same size, but I measured a 1/32" difference between the 1972 and 1974 pulleys. Not much but enough to cause them to interfere.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 790
From: Simi Valley, CA
With nice weather this week I'm finally diving in to tuning up the 1974 F250 390 4bbl (vin code M) I picked up last September. The truck is auto, with factory air and power steering.
While setting the timing I noticed that the front pulley is bent, bad enough to be noticeably visible when the engine is idling. The balancer doesn't wobble, but the pulley does.
The pulley on the truck is stamped D3TE-6312-A
I picked up another pulley at the salvage yard from a 1972 F100 that had an FE in it, the salvage yard pulley is stamped C9TE-6312-A.
At first glance they are identical; same height, same diameter, same groove spacing. The only difference I can see is that the two inner grooves on the salvage yard pulley seem to come to a sharper V at the bottom than the ones on my original pulley.
While setting the timing I noticed that the front pulley is bent, bad enough to be noticeably visible when the engine is idling. The balancer doesn't wobble, but the pulley does.
The pulley on the truck is stamped D3TE-6312-A
I picked up another pulley at the salvage yard from a 1972 F100 that had an FE in it, the salvage yard pulley is stamped C9TE-6312-A.
At first glance they are identical; same height, same diameter, same groove spacing. The only difference I can see is that the two inner grooves on the salvage yard pulley seem to come to a sharper V at the bottom than the ones on my original pulley.
ID numbers: D3TE-6312-AA & AB are triple sheave pulleys for 1973/76 F100/350 360/390 with A/C
Both have the same inner pulley diameter (7 5/32"), but the AA's outer pulley diameters are 8 13/32" while the AB's outer pulley diameters are 7 5/16."
ID number C9TE-6312-A (part number: C9TZ-6A312-A) is a triple sheave outer pulley for 1969/72 F100/250 2WD & F350 360/390 with P/S & A/C
It's 7 5/16" diameter, 1 13/64" long. Uses a 1/2" wide outer belt and (2) 3/8" wide inner belts.
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5th Wheeling
Joined: Sep 2018
Posts: 40
Likes: 2
Thanks Number Dummy! Your ability to come up with the most detailed information about any component of these old rigs is very much appreciated.
You are correct, of course - there was a "B" hiding under the shmutz at the end of the stamping number. On this truck, the harmonic balancer has no integral pulley; I believe the engine is original to the truck but it most definitely has been pulled out and gone through at some point, so I assume the original balancer was replaced.
You are correct, of course - there was a "B" hiding under the shmutz at the end of the stamping number. On this truck, the harmonic balancer has no integral pulley; I believe the engine is original to the truck but it most definitely has been pulled out and gone through at some point, so I assume the original balancer was replaced.
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Mountain Pass
Joined: Apr 2021
Posts: 140
Likes: 12
From: Bay Area
Hi Fordguy2100,
I am on the hunt for a A/C pulley for a 390 engine.
3 bolts hole.
if you have one and are willing to let go let me know.
Thank you,
I am on the hunt for a A/C pulley for a 390 engine.
3 bolts hole.
if you have one and are willing to let go let me know.
Thank you,
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