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How many thousands are cut from 64cc to 61cc's 243 heads?

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Old 10-07-2012, 04:18 PM
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Default How many thousands are cut from 64cc to 61cc's 243 heads?
My question is how many thousands are milled off when you mill a set of 243's down to 61cc's?
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Old 10-07-2012, 07:41 PM
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.030"
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Old 10-07-2012, 08:13 PM
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.006" per.CC. on avg.

.0207" based on a 64.45cc chamber.

64cc to 61cc, .018.
Last edited by RQSGTO; 10-07-2012 at 08:30 PM.
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Old 10-07-2012, 08:15 PM
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Those are two different answers
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Old 10-07-2012, 08:16 PM
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For your sake its .030 youre looking to mill
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Old 10-07-2012, 08:27 PM
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.007 off the head = 1cc of volume CC, u want to go from 64.45ccs to 61ccs that's 3.55 Ccs u need to remove. 3.55x.007= .02485, so u should mill ..025 thousandths
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Old 10-07-2012, 08:33 PM
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Originally Posted by anheuserbusch08
.007 off the head = 1cc of volume CC, u want to go from 64.45ccs to 61ccs that's 3.55 Ccs u need to remove. 3.55x.007= .02485, so u should mill ..025 thousandths

He didn't say stock 243, it may have a 64cc chamber. Is it a stock head?
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Old 10-07-2012, 08:36 PM
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It's stock I just didn't know it was 64.45cc
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Old 10-07-2012, 08:47 PM
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Originally Posted by anheuserbusch08
.007 off the head = 1cc of volume CC, u want to go from 64.45ccs to 61ccs that's 3.55 Ccs u need to remove. 3.55x.007= .02485, so u should mill ..025 thousandths

He needs to remove 3.45CC's. Using .007 I get .02415.

OP we are splitting hairs! Take your pick.
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Old 10-07-2012, 08:49 PM
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Haha it's close, but I'll take the little extra compression and take some more off
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Old 10-07-2012, 08:52 PM
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Originally Posted by RQSGTO
He needs to remove 3.45CC's. Using .007 I get .02415.

OP we are splitting hairs! Take your pick.
O yeah lol sorry you're right I added .10cc lol but still .025 he should be good
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