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How much can i MILL

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Old Nov 21, 2013 | 06:24 PM
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Default How much can i MILL
I need your EXPERIENCED opinion on this and not "upgrade your cam blah blah".
How much can I mill my 317's? Goin on a stock bottom end 00' 5.3L with a gm hotcam on .550 lift 219/228 .550/.550 112lsa. Keeping stock valve size. Do u think .030 off will be ok without PTV issues?
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Old Nov 21, 2013 | 08:45 PM
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I think you'll be absolutely fine. But always measure. I think somewhere around .050-.060 you'll have intake alignment issues. I'm betting with that cam installed right will be no problem.
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Old Nov 21, 2013 | 08:53 PM
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how bout change your heads...LOL; you'll likely have to mill them 70-80
thousandths just to restore the factory 9.5 compression ratio or are you
intentionally trying to lower it for a turbo application ????
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Old Nov 21, 2013 | 09:06 PM
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And the Hot cam is .525/.525 on lift unless you got something different than what I have
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Old Nov 22, 2013 | 09:51 AM
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I got it ground to .550 lift when i had it made, and yes a FI application is in its future.
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Old Nov 22, 2013 | 09:52 AM
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Thanks guys
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Old Nov 22, 2013 | 02:00 PM
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Lift at .050 has nothing to do with PTV clearance.
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Old Nov 22, 2013 | 02:04 PM
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i think you should be good with 30 over i have a friend running 317s milled 30 over on an lq4 with a 228r cam and there is no ptv issues
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Old Nov 23, 2013 | 12:16 AM
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What compression are you trying to maintain. I guess I don't follow the how much can I mill but i need to keep compression low for FI later.....What are you trying to accomplish?
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Old Nov 23, 2013 | 01:00 PM
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Originally Posted by MIKELMOTORCYCLE3398
I need your EXPERIENCED opinion on this and not "upgrade your cam blah blah".
How much can I mill my 317's? Goin on a stock bottom end 00' 5.3L with a gm hotcam on .550 lift 219/228 .550/.550 112lsa. Keeping stock valve size. Do u think .030 off will be ok without PTV issues?
Originally Posted by bowtieboySS427
And the Hot cam is .525/.525 on lift unless you got something different than what I have
Originally Posted by MIKELMOTORCYCLE3398
I got it ground to .550 lift when i had it made, and yes a FI application is in its future.
Well then it isn't a GM Hotcam is it?

Originally Posted by erickcastillo95
i think you should be good with 30 over i have a friend running 317s milled 30 over on an lq4 with a 228r cam and there is no ptv issues

WTF is "30 over" when discussing heads?


Hard to help people when the OP and half the respondents are clueless.
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Old Nov 24, 2013 | 09:18 PM
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I have an lq4 with a tsp 224 cam, I had my 317's milled .040" and used a stock gasket. The compression calculator I used put this combo at 10.2 to 1.
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