According to "The Buick - A Complete History" by Terry Dunham and Lawrence Gustin, 1934 series 50/60/90 engines started at 2861223 and series 40 engines started at 2894800. Since this engine number falls between those numbers, it must be a series 50/60/90 engine. Each series used a different size of engine:
Series 40 = 233 cid, 3 3/32 in. bore, 3 7/8 in. stroke
Series 50 = 235 cid, 2 31/32 in. bore, 4 /14 in. stroke
Series 60 = 278 cid, 3 3/32 in. bore, 4 5/8 in. stroke
Series 90 = 344.8 cid, 3 5/16 in. bore, 5 in. stroke
What series car are you working on?
Sean Smith
BCA# 42746
MBCC# 2122
SAH# 4186
Buickman Award 2015
1957 Special 4-door Riviera (hardtop) model 43
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