Editing 1964-1990 Oldsmobile V8 engine information

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'''[ Thanks to Joe Padavano, Bob Barry, Jeff Easton for this information ]''' 

==Introduction==
In 1964, Oldsmobile came out with a new 330 cid small block engine. In 1965 the 400 and 425 cid big block engines were introduced. Over the years other displacements were added. The Olds 455 was introduced in 1968, it was developed from the Olds 425, which was a tall-deck version of the 330 engine design. Both of which replaced the 394 cid V-8, which was developed from the design introduced in 1949 as the 303 cid "Rocket" V-8. Production of big blocks ceased in 1976, although some were used (not necessarily in cars) in the 1977 model year. Production of small blocks ceased in 1990.

The big and small block engine types are almost identical, with the big block having about a one inch higher deck than the small block. The bore centers are the same, the only differences between the small-block and big-block Olds blocks are the deck height (9.33" and 10.625", respectively) and the main journal size (2.5" and 3.0", respectively); the diesel 350 used the BB size mains, however. All small blocks have a 3.385" stroke; the displacement varied by increasing the bore size. 

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==Engine names==
The engines were sometimes named, and this was printed on the air cleaner label or sticker. "Rocket" was used early on and continued to be used intermittently throughout the years. The mid 1960's 425 was known as the "Super Rocket". Some featured "Ultra High Compression" on their labels. The high performance 350 and 400 were named "Ram Rod" in 1968-'69; the 350 became the W-31.
[[File:1966-oldsmobile-442ultra high comp.jpg|left|thumb|300px|1966 442 Ultra High Compression]][[File:1969 ram rod 350.jpg|thumb|300px|1969 W-31 Ram Rod 350]][[File:1957j2 olds.jpg|thumb|left|300px|1957 J-2 Golden Rocket]][[File:1968 Hurst Olds 455.jpg|thumb|300px|1968 Hurst Olds W-30 455 Rocket]] 
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