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03-04-2012, 11:36 PM | #1 |
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Milling 317 to raise compression on lq4
If I have .030 milled from my 317 heads, what will that raise the compression to on my stock bottom end lq4? I could not find a conversion factor. I don't want to take too much and cause intake alignment issues.
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03-05-2012, 03:36 PM | #2 |
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Re: Milling 317 to raise compression on lq4
I think most say it gets to the 10s.
www.performancetrucks.net has lots of info
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03-08-2012, 01:58 PM | #3 |
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Re: Milling 317 to raise compression on lq4
Another option would be to put in LQ9 pistons. LQ9 had a higher CR and I believe it was only because of pisions, not head or rods/crank.
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03-08-2012, 02:54 PM | #4 |
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Re: Milling 317 to raise compression on lq4
True, but my engine is low mileage and no real need to change out the pistons, re-balance, etc. As it stands now, I can remove the heads and have a little machine work done.
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03-08-2012, 06:35 PM | #5 |
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Re: Milling 317 to raise compression on lq4
If you want to raise the cr i would just find a set of used 243 heads. 317 have a 72cc chamber and the 243's have a 64cc chamber. i would think it would be cheaper than any mill work.
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03-08-2012, 11:14 PM | #6 |
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Re: Milling 317 to raise compression on lq4
I had read that the 243 did not flow as good as the 317's but I don't know that to be true. I thought they were the same design but one having a larger combustion chamber. I'm thinking now I will keep my current set up and my go with twin turbos.
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