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Originally posted by mustangman65_79
BTW, I thought I read somewhere that a 289 does have a smaller bore?
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No both are 4.005 stock
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Also,a stock 289 vs a stock 302, the 289 has a higher compression ratio.
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No, compression ratio is mostly determined by the heads, head gasket and shape of the top of the piston. From the Mr Fomoco page
http://fomoco.com/index.asp?Dept=4&Tool=0
Disp Engine C/R
289 C 9.8 to 9.5 depending on year
289 A 10.3
289 K 10.5
302 F 8.5 to 10.0 (higher in early years, low in 73,72
302 J 10.5
HTH
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