Where is it marked 390 HD? Is it stamped or cast in? All FE and FT blocks had 5 mains. But some blocks had the HD crank webbing and crank saddle. And some thicker cyl walls.
I have a 66' Fairlane GTA with a 1974 390 V8 truck block. It has a mirror image 501 on the front of the engine block. It is supposed to have more casting support in the bottom end, higher nickel content, and supposedly thicker cylinder walls. Can you see a casting number on your block? If it starts with a 'D' it is a 1970 series. The second digit is usually the year. Example: D4 would be 1974.
Hope this helps!
Terry B.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Ford Forums
1.4M posts
115.4K members
Since 1999
Ford Forum is a community to discuss all things Ford. Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more!