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Original Message
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| RE: engine ID |
| By Paul M. - 10/31/2002 11:01:05 PM; IP 12.228.168.146 |
As you've already discovered, block casting #'s aren't very helpful, especially after the very early 60's. Some of the mid-late 60's and 70's FE block #'s were also used (cast) as FT's, for medium/heavy duty trucks.
If you can, check the casting # on the crank. 1U is the most common 428 crank. 2U would be a 390. 3U would be a 360 (ugh!). Older casting #'s were in the format as shown in the first post, as Royce pointed out that it was a 390 crank. So it's best to have an ID guide along, preferably one you know to be correct!
If you cant see the crank, a quick way to check the stroke is with a small dowel, inserted through the spark plug hole. Measure the difference (make a mark at TDC, and another at BDC for that cylinder).
3.78 inches (3 3/4 in rough measurement) is a 390, 3.98 (4 rough) is a 428.
Hope this helps! |
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