Ten over bore on a 98?
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From: Mooresville, NC
Ten over bore on a 98? I was wondering if it would be safe to go with a 3.908 piston in a 98 LS1. I search for it, and most people say 3.905 is as big as you can go, but is .003" really going to make a difference? Thats only .0015" bigger if you look at it as how deep the extra size will cut into the cylinder wall. I would like to know, because I already have the 3.908 pistons, and a 98 model block.
You're not supposed to. The OEM sleeve looks thicker up top, but if you look at it from the bottom side, it is pretty thin. All that said and out of the way, a few of us have still done it. I checked with several forum members before doing it and they didnt (and still havent had any problems).
Originally Posted by FIREHAWK#608
Zero in the wrong spot. Typo. 
Thanks. Haven't you finished that 396 yet?
Thanks. Haven't you finished that 396 yet?
No, I never have enough time. Between the job, wife, kids, snowobarding, and the kids sports I have very little time. I've been porting the Fast 90 intake over the last couple nights.I believe I will finally start clsing up the block next week.
Originally Posted by ROCNDAV
No, I never have enough time. Between the job, wife, kids, snowobarding, and the kids sports I have very little time. I've been porting the Fast 90 intake over the last couple nights.I believe I will finally start clsing up the block next week.
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I would go with a set of 3.903's personally. 3.908's might be ok if you aren't spraying the major crap out of it, but then again what happens if the cylinder wall cracks. You're SOL. You'll just have to decide.
Oh yeah, I forgot to mention that. I didn't follow the rules and over bored as did Sam98WS6 but neither of us are planning on adding a power adder (NOS, BLower, SC). If you are planning to go with a power adder, then I would suggest that you stay in the .004 hone or get a different block.
