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decking a set of 243 heads for 5.3

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Old Feb 11, 2011 | 07:54 AM
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Default decking a set of 243 heads for 5.3
ive got a set of 243 heads that im going to be installing with a Zo6 cam on a 5.3 shortblock, but i dont want the compression to drop significantly so im trying to figure out how much i need to take off the heads to get back to 61 cc's.

this engine will be turbo'd as well so im not too concerned if the head cc's come out a bit over 61 cc's....but at the same time i dont wanna go with a 8.5-1 compression ls, id still like some drivability.

how much should i deck the heads??
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Old Feb 11, 2011 | 07:55 AM
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i was thinking around .020 off the top but im really in the dark on this one
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Old Feb 11, 2011 | 09:29 AM
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The general rule is .006" for one cc in chamber size. So if you are trying to go from 64 to 61 milling them .020" would get the job done.
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Old Feb 11, 2011 | 04:46 PM
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thanks for the info
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Old Feb 11, 2011 | 05:35 PM
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As long as don't go more than .030
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Old Feb 12, 2011 | 11:48 AM
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how much would i need to mill some 241 heads to match the cc's on 5.3L 706 heads?
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Old Feb 18, 2011 | 12:14 AM
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anybody?
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Old Feb 18, 2011 | 04:01 PM
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5.67cc
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Old Feb 20, 2011 | 03:11 PM
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Originally Posted by PREDATOR-Z
5.67cc
so how many thousandths is that?
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Old Feb 20, 2011 | 07:13 PM
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Do some Math, Jeese
.006 x Head cc removed =
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Old Feb 21, 2011 | 09:31 AM
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Ahh... The rule of .006"= 1cc drop is not linear throughout the entire combustion chamber. The first .006" removes more material than the second, second more than the third, and so on and so on...
While .006" = 1cc is very close, it's not exact. So .030" doesn't remove 5cc exactly.
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Old Feb 21, 2011 | 11:50 PM
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Originally Posted by Mighty Whitey
Ahh... The rule of .006"= 1cc drop is not linear throughout the entire combustion chamber. The first .006" removes more material than the second, second more than the third, and so on and so on...
While .006" = 1cc is very close, it's not exact. So .030" doesn't remove 5cc exactly.
how much would you say should be removed? .40 thou or so?
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Old Feb 22, 2011 | 08:39 PM
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Originally Posted by LS Desert Ranger
how much would you say should be removed? .40 thou or so?
Proper way is remove .035, measure chamber, remove more if necessary.
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