Cummins Bore March 13, 2017 08:13AM
How far can you bore a 5.9 Cummins Safely?

Re: Cummins Bore March 13, 2017 01:05PM
4 1/8 hard blocked alky don't no about diesel if you put for what class someone can probably help

Re: Cummins Bore March 13, 2017 11:36PM
LLSS alcohol don't want to hard block.

Re: Cummins Bore March 14, 2017 08:47AM
You would be okay at 4/18 but you would be a few cubes over the 370 unless you de stroked a little I ran them both ways with no trouble

Re: Cummins Bore March 18, 2017 04:35AM
Lewis could you bore and install liners to give you a bore of 4.240" or is there not enough room? Would that last in a 3000rpm diesel class?

Re: Cummins Bore March 18, 2017 12:31PM
YOU better ask some of the truck pullers I cant answer that you may need a deck plate with the sleeves ran up through it

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