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Old 10-21-2011, 11:45 PM
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Boring out my 388 stroker and want to know what size it will be now...

I have a 6.4L 388ci stroker motor (350 block bored .040 over with a 400 crank). I'm changing the overbore to .060 over, and keeping the crank. How many cubic inches and liters will my motor be now?

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Old 10-22-2011, 12:00 AM
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That would be a 406, rounded up to a 6.7L, I calculate your 383 at 6.3L. Be sure your 350 block can take an .060 over, some of the newer blocks are marginal.
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Old 10-22-2011, 12:25 AM
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not sure what the stroke is,but a 388 with a .040 bore going to a .060 bore will give you approx 391 ci.
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Old 10-22-2011, 05:01 AM
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Quote:
Originally Posted by xsracing
I have a 6.4L 388ci stroker motor (350 block bored .040 over with a 400 crank). I'm changing the overbore to .060 over, and keeping the crank. How many cubic inches and liters will my motor be now?
Your Engine with bore of 4.04 and stroke of 3.75 is 384.57 CID. 6,303.09 cc or 6.3 liters.

Your Engine with bore of 4.06 and stroke of 3.75 is 388.39 CID. 6,365.66 cc or 6.4 liters.

To find the liters of an engine divide the CID by 61. To find the CID from liters, multiply by 61. The exact number is 61.0237438366662.
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Old 10-22-2011, 08:57 AM
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Oops, you guys are right, I got upside down in the calculator somehow...sorry.
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Old 10-22-2011, 09:10 AM
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I'm pretty sure the stroke is 4.00 so how does that affect the size in liters?
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Old 10-22-2011, 09:25 PM
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Quote:
Originally Posted by xsracing
I'm pretty sure the stroke is 4.00 so how does that affect the size in liters?
The 400 SBC uses a 3.75" stroke crank. A 4" crank will barely fit into a 350 crankcase by grinding either dangerously close or actually into the water jackets-which then requires at least a partial fill of Hardblok.

Obviously a longer stroke increases the displacement. Do you actually have an engine or is this at the planning stage? In any event, use a calculator like THIS and you can dream up all sorts of engine sizes.
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Old 10-23-2011, 12:48 PM
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Obviously. I knew it increases the displacement. Yes I have the engine, and I'm definitely having it bored .060 over, I was just curious as to what size it will be when its finished. Thanks for the help everybody
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