How much to mill on LS2 243s?
03-15-2009, 12:15 PM
#1
How much to mill on LS2 243s? I have a set of stock LS2 243 heads that I will need to mill some before installing on my cam only motor in order to increase the compression. With a .040 MLS gasket, what would be the ideal amount to mill on these heads so I come up with about 11.0:1 compression?
03-15-2009, 01:41 PM
#2
Out of the box with the .040 (3.910 gasket bore) head gaskets will put you at 10.94. This assumes the pistons are .008 OUT of the hole.
If you flat mill them to 62cc's [(approximately .017") .0065" per cc X 2.5 cc = amount to flat mill] it will put you at 11.25:1. This is a nice SCR for a DD'er.
If you flat mill them to 62cc's [(approximately .017") .0065" per cc X 2.5 cc = amount to flat mill] it will put you at 11.25:1. This is a nice SCR for a DD'er.
03-15-2009, 07:02 PM
#4
He saying he would mill them .017" to remove 2.5cc from the combustion chamber, making them go from 64-65cc before milling to 62cc after milling.
His equasion is just saying for every .0065" you mill off, you will loose 1cc of combustion chamber. So to remove 2.5cc you multiply .0065 x 2.5 (amount to remove 1cc multiplied by the number of cc wanted to be removed)
His equasion is just saying for every .0065" you mill off, you will loose 1cc of combustion chamber. So to remove 2.5cc you multiply .0065 x 2.5 (amount to remove 1cc multiplied by the number of cc wanted to be removed)
03-15-2009, 10:02 PM
#5
He saying he would mill them .017" to remove 2.5cc from the combustion chamber, making them go from 64-65cc before milling to 62cc after milling.
His equasion is just saying for every .0065" you mill off, you will loose 1cc of combustion chamber. So to remove 2.5cc you multiply .0065 x 2.5 (amount to remove 1cc multiplied by the number of cc wanted to be removed)
His equasion is just saying for every .0065" you mill off, you will loose 1cc of combustion chamber. So to remove 2.5cc you multiply .0065 x 2.5 (amount to remove 1cc multiplied by the number of cc wanted to be removed)
