All 400 blocks from 68-73 or 74[somewhere around there] that I have seen have 4 bolts drilled and tapped but only use 2 bolt caps. Very common, nothing special.
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Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
You killed it, We build it!
520-294-5758
64 GTO, under re-construction, 412 CID, also under construction.
87 S-10 Pickup, 321,000 miles
99Monte Carlo, 293,000 miles
86 Bronco, 218,000 miles
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