What month?
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New User
Joined: Jan 2005
Posts: 12
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What month?
Ok, I'm about to pull the head on the 300 here shortly to have it sent to the machine shop for some work. I was looking for a head gasket set at work and come to find out, '91 was a split year (apparently different valve seals, at least what I've gathered). There's a set to 2/??/91 and one that's 2/XX/91 and later. I can't tell what month it was made by looking at the truck as the truck is an '87 and the motor is a '91. I don't have the truck the motor came out of so no jamb sticker. Is there anyway to tell by the casting numbers on the block/head?
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
If the casting number starts with an E, it's from the older engine, pre-91, and it if starts with an F, it's a 90's. I believe the casting numbers jumped from E7 to F1, but I might be wrong.
Posting Guru
Joined: Jul 2003
Posts: 1,398
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From: Davenport, IA
Originally Posted by Ford_Six
If the casting number starts with an E, it's from the older engine, pre-91, and it if starts with an F, it's a 90's. I believe the casting numbers jumped from E7 to F1, but I might be wrong.
