Hi to all, According to the buick books that I have read, the 340ci is a stroked version of the 300. In my service manual for 1966 buicks the only difference I can see is that the 340 has a longer stroke, there is no mention in my buick workshop manual about a different block, so where does the taller block? thang come into it. I know the earlier 215 was smaller but I was under the impression that the 300ci and the 340ci shared the same block and the only difference was the internal length of the stroke, any info would be much appreciated, thanks, Louis o No:
215-300-340 Hi, there IS this the info your looking for? Engine Years Bore Stroke Main Rod Rod Deck Pin Dia Dia Length Height Height 215 61-63 3.50 2.80 2.3 2.0 5.66 9. 300 64-67 3.75 3.40 2.5 2.0 6.38 9.50 1.831-1.842 340 66-67 3.75 3.85 3.0 2.0 6.38 10.15 1.831-1.842 350 68-79 3.80 3.75 3.0 2.0 6.38 10.18 1.800-1.855 hope that the format didn't change Doug B.
