Bore to Stroke Ratio Observations
Teching In
Joined: Nov 2001
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Re: Bore to Stroke Ratio Observations Also, keep in mind that two engines with the exact same bore and stroke ratio won't have the same rpm capabilities.
350 SBC has a 4" bore and 3.48" stroke. That's roughly a 1.15 B/S ratio. An engine built with a 400 block (4.126" bore) and a custom crank (say, 3.6" or so) would have a roughly similar B/S ratio, but all things being equal, the 350 will rev higher because the pistons are smaller and have less mass (and therefore less momentum). In order to get equivalent rpm capability from the hypothetical 400-based motor in the example above, you'd hvae to find pistons and rods that wieghed roughly the same as the ones in the 350.
350 SBC has a 4" bore and 3.48" stroke. That's roughly a 1.15 B/S ratio. An engine built with a 400 block (4.126" bore) and a custom crank (say, 3.6" or so) would have a roughly similar B/S ratio, but all things being equal, the 350 will rev higher because the pistons are smaller and have less mass (and therefore less momentum). In order to get equivalent rpm capability from the hypothetical 400-based motor in the example above, you'd hvae to find pistons and rods that wieghed roughly the same as the ones in the 350.
