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compression bump no retune

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Old Mar 8, 2017 | 07:11 PM
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Default compression bump no retune

I just bought a 2004 silverado 2500hd with an lq4. Lots of broken bolts on the exhaust manifolds. Passenger side has 2 left....

Will the stock tune be ok with a set of 243s on it until the turbo goes on? I will do ls9 gaskets and studs also.

I have removed plenty of broken bolts out of aluminum heads, but the heads were on the bench.
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Old Mar 8, 2017 | 07:46 PM
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probably? run premium and dont beat on it?
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Old Mar 13, 2017 | 06:37 PM
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Got it done yesterday. Seems to run better, but that's probably because I don't hear the massive exhaust leaks everytime I give it a little throttle. And the p0300 and whatever the 02 code was has not come back. Put in alper studs, and one was wrong. So have a stock reused bolt back in torqued to 50.....Emailed alper, hoping to hear back soon.

Anyways, filled up with 87 this morning and no pinging. Not driving it hard or anything.
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