I had a couple of 70 400's and they were drilled four bolt but only had two bolt Caps on it. I've heard that the 455's were that way too for a while. I've also heard that most 428s in 67 were only 2 bolt blocks. I have a 69 428 Factory Replacement block out back that was 370 hp. it has 4 bolt caps. FR blocks had no markings, just casting marks. 69 HO block is of course 4 bolt as listed above.
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