The first year for the SBC 350 was 1967 and appeared in the new Camaro.The 3.8/229 was aSBC 5.0/305 with two cylinders lopped off - same bore (3.736") and stroke (3.48").
The 4.3/262 was a
The 305 was an underbored 350. I think the 350 debuted for 1969, and the 305 for 1976.
I remember hearing of colonade-style Oldses and/or Buicks around 1976, so I think the SBC-based 3.8 came before the 4.3. (I first remember the 4.3 from Astro vans c. 1983 or '84.)
The 3.8L V/6 was first introduced by Buick in 1962 as a 3.2L 198cid and was originally derived from Buick's 3.5L 215cid aluminum block V/8 with two cylinders lopped-off., and is also closely related to Buick's 4.9L 300cid V/8 which itself was a cast iron block version of the 3.5L. The V/6 was sold to Jeep in 1965 then repurchased in 1973 from AMC reappearing in 1975 as the 3.8L 231cid. The Buick V/6 engine was also manufactured in 3.0L, 3.3L, and 4.1L displacements along the way.
The SBC based Chevy V/6 first appeared in 1978 as the 3.3L 200cid in the new downsized Malibu, originally a SBC 4.3L 262cid V/8 (Monza/Nova) with two cylinders lopped-off, but Chevy also manufactured this engine as a 3.8L 229cid in 1980 to replace the 250cid I6 in cars, and then the 4.3L 262cid V/6 came in 1985 and was used across the Chevy line in RWD cars and light trucks.
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