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bored over
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moptop
New User
| Posts: 12
| Joined: 07/07
Posted: 08/26/07
05:18 PM
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How do you calculate the cubic inches when you bored over the motor? I got a 455 and its .30 over.
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CSIROC
Guru
| Posts: 793
| Joined: 11/05
Posted: 08/26/07
06:58 PM
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455 what? Buick, Olds, Pontiac?
You need the bore and stroke. Then its just (pi/4) X bore^2 X stroke X number of cylinders. You'll just add 0.030 to the bore.
68 Olds Cutlass ~ 350 Rocket
85 Delta 88 ~ 425 Rocket
02 Silverado 4X4 ~ 5.3L
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moptop
New User
| Posts: 12
| Joined: 07/07
Posted: 08/31/07
04:54 PM
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Pontiac.
bore 4.182 inches(w/bore), stroke 4.21, V8
What is the pi/4?
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Posted: 08/31/07
05:20 PM
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Part of the calculation.
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The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. Needing to replace a '69 Firebird 400.
http://www.bangshift.com/forum/index.php?topic=6189.0
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waynep712
Enthusiast
| Posts: 436
| Joined: 10/07
Posted: 10/13/07
01:10 PM
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the simple way
bore size divided by 2.
than number times itself,
that number time 3.1416.
times stroke. times# of cylinders
like this..
4.155 divided by 2 = 2.0775
2.0775 X 2.0775 X 3.1416 X 3.48 X 8 =377.48715
its easy..
again
4.030 divided by 2= 2.015
2.015 X 2.015 X 3.1416 X 3.48 X 8 = 355.11595
be aware that not all bore sizes are exactally even.. some are under and some are over is all depends on piston diameter and cylinder bore clearance machined. 
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