l92 pistions{6.2} in a lq9 {6.0}
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i got a lq9 that needs a rebuild, well could u bore it out and used 6.2 pistions on the stock lq9 rods and crank? would this be worth it? thanks john
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head cam car.... not my dd was just thinking if i could fine some l92/ls3 pistions that somebody pulled out and was just laying around, i could get them 4 cheap. mite make little more power. i was just thinking bout it and wonted to see what you guy thout!
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In this guy's case, I don't see a problem. He is wanting to use cast pistons anyways, the pistons will go before anything happens to the cylinders.
I say go for it. For a head/cam car, no sense in buying forged pistons when the stock cast pistons will be adequate, if not better suited for the job.
I say go for it. For a head/cam car, no sense in buying forged pistons when the stock cast pistons will be adequate, if not better suited for the job.
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John, if you already have the pistons and are looking to get by on a budget, then go for it. We bore 6.0 blocks .060+ all the time and have zero complaints. But once you go .060 (or .065 in your case), that is it unless you want to make it a race only block. In that case you could go a little farther if you wanted to.
Last edited by 93ls7z; 01-24-2010 at 05:44 PM. Reason: added info
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If you are not going to forge the whole bottom end, I'd just bore it .030" over and get some good replacement pistons. Going with the stock L92 stuff isn't going to give you enough of an advantage for the work done.
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Because the short block is the foundation for the rest of the engine, you know that. Why build it now with stock cast pistons, stock cast rods with the top end he has now. What, he might see 15 hp now and then have to buy forged pistons and rods (Crank?) later. If he NEVER plans to modify the engine again it would be feasible, but I say save a bit more money and at least put forged 4.00" or 4.03" pistons in it to fit the stock rods and crank he already has. Then later he can buy forged 6.100" rods if he gets the itch for more power. I would just much rather put forged pistons in if I had the thing all torn apart. Machining a block and then going back to a stock cast piston doesn't seem money or time efficient.
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Because the short block is the foundation for the rest of the engine, you know that. Why build it now with stock cast pistons, stock cast rods with the top end he has now. What, he might see 15 hp now and then have to buy forged pistons and rods (Crank?) later. If he NEVER plans to modify the engine again it would be feasible, but I say save a bit more money and at least put forged 4.00" or 4.03" pistons in it to fit the stock rods and crank he already has. Then later he can buy forged 6.100" rods if he gets the itch for more power. I would just much rather put forged pistons in if I had the thing all torn apart. Machining a block and then going back to a stock cast piston doesn't seem money or time efficient.
I would personally prefer a stock OE piston over a 2618 forged piston in most cases. The OE pistons are very well designed pieces, and can handle more power than what most people give them credit for. Take TSP's "stock bottom end" Camaro for example. It runs 136MPH in the 1/4, and at ~2900lbs, it equates to roughly 570hp. I think some of us older members remember TRMN8TR out running Ford GT's and turbo mustangs with a heads/cam and 200 shot on a "SBE" LS1.
Not only that, but you can fit the pistons much tighter than the forged pistons, meaning much less piston slap (if any at all). The top ring is higher up, meaning less unburned hydrocarbons and less emissions (not that it really matters to most people on here), and better (if only slightly) fuel economy. The super flat, hard anodized top ring land is really nice too, which I haven't seen on any aftermarket pistons...yet.
In his application, I think putting money into a good tune would go further than putting that money into forged pistons.
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Because the short block is the foundation for the rest of the engine, you know that. Why build it now with stock cast pistons, stock cast rods with the top end he has now. What, he might see 15 hp now and then have to buy forged pistons and rods (Crank?) later. If he NEVER plans to modify the engine again it would be feasible, but I say save a bit more money and at least put forged 4.00" or 4.03" pistons in it to fit the stock rods and crank he already has. Then later he can buy forged 6.100" rods if he gets the itch for more power. I would just much rather put forged pistons in if I had the thing all torn apart. Machining a block and then going back to a stock cast piston doesn't seem money or time efficient.
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KCS, those are some very good points that I had not completely thought out. I had bad luck with my LS1 stock piston ring land and crown blowing apart and my car is normally aspirated. If the L92 piston is a lot better, which a few people claim, he might be OK staying normaly aspirated. It is just not what I would advise; but I guess that is just because of my experience.