Originally Posted by Shelby1
Yes that code is for a 74 truck engine, but that code is also on 360/390/& 410 blocks ,the only way to know what you have is to measure the stroke and in the case of the 410 the bore also. since you are going to pull the motor anyway ,when you pull the pan measure the stroke then.You will have people tell you to look at the crank for the casting # and that will tell you what you have but I hvae found crank's with the wrong # that have been reground to the right stroke. Point is you never know what you'll find when you open a motor up.
the stroke's on these motors are 360...3.5, 390(391)...3 7/8....410 same as the 390 plus larger bore.
hope this helps
Oh! if it is a 390(391) truck motor it has the strongest bottom end of all the FE blocks.
Yes it is a 74 truck block. It is a fine piece and so is the truck crank. No problems.
agree The 410 cube is a 66-7 Merc big car only and is just a 390 with a 428 stroke (3.98) crankshaft. The 410 is externally balanced like a 428. That can be seen on the damper.
Like Kenny said, years can make a mix of parts. Verify what you have.