Quote:
Originally Posted by tmax5151
i checked the bore and stroke and it is 4.13 bore and the stroke looks to be around 3.75 maybe a little more,checked and it said it was a 406.
did they have 406 in 65 or am i reading the date code wrong
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I didn't see the date code in any of your posts, there were only casting codes,it would look like "5J12" or a similar format. I have the heads listed as standard 352/390 heads '64-'65. The rods, as pointed out, need a suffix to tell for sure, likely with the heads and block #s they are late style rods that were standard in everything other than PI/CJs and 427s. If they are the PI type rods they have a 19/32 nut, a give away. With the #'s given, I am surprised that no one has commented that it is likely a 390 block overbored. It is commonly done and I see them on e-bay regularly . They are usually listed as 428 blocks and have the accurate details(390 bored to 428 bore) within the description. I would guess that is what he has, most of the time they are made into 428s or larger, but a 406 version wouldn't be as hard on the walls if they were thin.
I had 2 406 engines, they did have the HP but were sans crossbolts, although they were cast with the bosses. The rods for a 406 are like the later CJ rods but would have had an older #.