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So I recently had my ls1 rebuilt . Even though I asked the machine shop not to bore it more than 10 they took it to .030 . Said not to worry about it would be okay . How long will it last ? This is everything that was done
Machine shop said they would transfer everything to a new block for free . What’s my next step ? really need some advice here
You’ll get all kinds of answers. Some say an ls1 can’t take much more than a hone. Some also say not bore an ls3 block more than .010 but some go over .050 with no issues. Sonic checking the block is the key
Get out of there now. Look at Thompson Motorsports, Texas speed and Performance, ATK and other builders on here.
That LS1 is worthless at .030 over. And where did they find pistons for that/ I've never heard of that size unless they actually went .031" over. Which is a replacement piston for an LQX or an LS2.
They don't even show balancing in there. Can only imagine what they'd charge to balance this assembly!
Take your **** out of there, cut your losses, hopefully you haven't had any work done.
For a few more hundred bucks, you can have a bad *** LSX/LS3 engine build by GM. The other builders above can build you a mild, long lasting engine with more power that will run a long time. $760 for a Cam! That's absurd!
LASTLY, you're in LS country. There's guys there that would love to help you out by pulling/removing your engines for you. Just provide the beer and maybe a few bucks.
I also unknowingly had a machine shop bore an early F body LS1 .50mm over (~.020") years ago. We ended up using H868CP-50mm pistons in it and it ran 27,000 miles before I sold the truck. Food for thought.
I also unknowingly had a machine shop bore an early F body LS1 .50mm over (~.020") years ago. We ended up using H868CP-50mm pistons in it and it ran 27,000 miles before I sold the truck. Food for thought.
early 97-98 LS1 blocks are throw away I wouldn't use them. A 5.3 iron will take a 20 over LS1 bore
I hope you paid with credit card.
Consider starting a dispute with credit card company now that you didn't get what you paid for.
It should be common knowledge for any semi-competent shop to know .030 on an aluminum LS1 block is a NO GO.
Did they sonic check the block and sleeves? Have a copy of the result?
It may run for a while at .030 hard say. If the liners are perfect in alignment hell it might run ok. I've read of a few LS2's getting punched .065 over and ending up with an LS3 bore size. Liked, a few LS3's have went 4.125 according to the Internet.
My guess is if they did .030 over on an aluminum LS1 block and didn't do any sonic checklist that's it's possible other issues will arise quickly. You know like shop rags left in the valley etc.
Last edited by 99 Black Bird T/A; 04-20-2019 at 04:15 PM.
Why just those two years for the block as opposed to the rest of the year's?
I suspect OMC is referring to the 97-98 LS1 block liners only being able to generally support a ~.005 hone. Maybe .007 in some cases. The 99+ LS1'S can support ~.010 maybe .012 in some cases. That's my guess.
Did the early LS1 block have spray in liners or extremely thin liners?
Whether or not they were sprayed in (I don't know), they were very thin, which precluded anything more than about a .005" hone. Hence the throwaway aspect.
I believe the GM manual states the MAX service limit is only 0.010 on all LS1 blocks. I looked in Alldata from 97- 04 vehicles and this is what it comes back with. Says GM has .25MM (0.010) Oversize piston and ring set available for the LS1 engine.
That being said, I know people have serviced them with .50MM (0.020) sized pistons and they are available from most piston manufacturers for the LS1 specifically. I also see some .75mm (0.030) Pistons available specifically for the LS1
04-18-2019, 10:18 PM
LS1 bored over .030 
