c.i.d. for a 383 bored .060 over??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-16-2006, 09:02 PM
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c.i.d. for a 383 bored .060 over???

i just built a 383 stroker that i bored .060 over i was wondering what the ci. of this motor would truly be....?

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Old 08-16-2006, 09:10 PM
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I would say 388.
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Old 08-16-2006, 09:33 PM
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Do it the old way....... 1/2 of total bore squared times pi (3.1415927), times stroke, times the number of cylinders.
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Old 08-16-2006, 10:10 PM
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Let's make sure we are on the same page. you had a 383 (4.030" bore X 3.75" stroke), you now have a 4.060" bore X 3.75" stroke, correct? If so then it is a 388. If you had a stock 4.00" bore and 3.75" stroke it would be a 377.

What you did is bore the 383 .030" over not .060" over.
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Old 08-16-2006, 10:22 PM
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Heres another formula to figure cubes, just found this one myself.
Bore x Bore x Stroke x 0.7854 x 8 ....or number of cyl. you have.
4.060 x 4.060 x 3.75 x 0.7854 x 8 = 388.38 CI
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Old 08-17-2006, 01:02 AM
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350 377 383 388

A 350 block + 350 crank = 350
a 350 block + 400 crank = 377
a 350 block+.030 bore + 400 crank = 383
a 350 block + .060 bore + 400 crank = 388

hope that explains it simply
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Old 10-21-2006, 08:20 PM
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Quote:
Originally Posted by trucks_chevrolet
A 350 block + 350 crank = 350
a 350 block + 400 crank = 377
a 350 block+.030 bore + 400 crank = 383
a 350 block + .060 bore + 400 crank = 388

hope that explains it simply
What's a 350 block + .060 bore + 350 crank = ?
and a 350 block + .040 bore + 350 crank = ?
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Old 10-21-2006, 11:05 PM
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With a stock crank,
60-over is 360.4
40-over is 356.9
30-over is 355.1
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Old 10-21-2006, 11:16 PM
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If you plan on boring a 350 .060 over its a good idea to have the cylinders sonic tested for thickness as we find very few that would be safe or have real good real seal at .060
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