360 or 390
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
360 or 390
Scott, You have to measure the stroke. Get a piece of 14-2 house wire about 8" long and run the white down one of the front spark plug holes. Lay a marker against the manifold on the wire, have a bud turn the engine over a couple revs with a socket on a pully, and then measure the mark. Report your find back here and we will decifer it for you. Most likely you have a 360. 
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John
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[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
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John
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[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
360 or 390
If you can get a peek at the flange of the crank, then:
390 has square notch in crank
360 has semi-circle notch in crank
Otherwise, you'll have to measure the length of the stroke like John mentioned or tear it down.
390 has square notch in crank
360 has semi-circle notch in crank
Otherwise, you'll have to measure the length of the stroke like John mentioned or tear it down.
