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« Last post by WkillGS on April 13, 2024, 09:22:39 AM »
Other than the unusual stamping, everything else looks ok,
The '-705' block was used in 65-66 GS's as well as other years. Same for the '-914' cylinder heads.
The 65 and 66 Skylark GS engines weren't anything special as far as specs.... compression ratios, camshafts, and distributors are the same as the other 401's put in the big Buicks. For '65 they even used the same 3921 carb for the automatics. The 3/4 speed got a 3922 stamped carb.
There are some GS-only items to make it fit the Skylarks..... Oil pan, exhaust manifolds, and engine mounts. At the front oil pan bolts are two little brackets that guide the rubber fuel line from the left side to the fuel pump on the right side.
Another possibility for the engine stamping is it was a warranty replacement.