I have a goto guy in England of all places that is very generous with his information. Thanks again Jeff! This will help make more sense out of displacement numbers:

235 Stock: (bore ÷ 2)^2 × stroke × Pi × 6 = 235.49"

+.080" = 246.18"

Hopefully my new 246 will be back from the machine shop soon so I can finish the article.

So I am waiting on stuff and have nothing better to do.. let's figure out some numbers for the tenths (some of the more common) bore configurations based on Pi being 3.14159:

235 Engines: Based on Bore of 3.5625/Stroke is 3.9375
Based on Formula: (bore ÷ 2)^2 × stroke × Pi × 6 =
.000 Overbore: 235.490
.010 Overbore: 236.813
.020 Overbore: 238.141
.030 Overbore: 239.472
.040 Overbore: 240.807
.050 Overbore: 242.146
.060 Overbore: 243.488
.070 Overbore: 244.834
.080 Overbore: 246.184

261 Engines: Based on Bore of 3.7500/Stroke is 3.9375
Based on Formula: (bore ÷ 2)^2 × stroke × Pi × 6 =

.000 Overbore: 260.930
.010 Overbore: 262.323
.020 Overbore: 263.721
.030 Overbore: 265.121
.040 Overbore: 266.526
.050 Overbore: 267.934
.060 Overbore: 269.346
.070 Overbore: 270.762
.080 Overbore: 272.182

I realize you can't get some of these bores without requesting a custom setup, but they are interesting nonetheless.

Deve

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