johnster

iTrader: (27)

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

baker163

iTrader: (1)

Why would you want to go thur all that, just to put stock cast piston's back in it?

SweetS10V8

iTrader: (4)

I dont see why you couldnt.

84BuCkeTOfStEeL

iTrader: (7)

Just put into figure how much you will spend? And is it worth your time for the gain? What is your goal for this motor??

johnster

iTrader: (27)

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!

1CAMWNDR

iTrader: (21)

Not worth it.

johnster

iTrader: (27)

so u think its not worth the money? or i wont see any more power?

the_merv

iTrader: (88)

Max you can bore that 6.0l Block is about .060" over..and even then you are going to have to have it Sonic Checked.

I would bore it .030" over if you need fresh bores and go with that.

mark underwood

iTrader: (2)

Folks go 4.065 on iron blocks all the time...

It seems crazy but all the blocks that have tried it were fine...

the_merv

iTrader: (88)

They are on a timeclock..

KCS

iTrader: (20)

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.

johnster

iTrader: (27)

well if it not going to hold up then dont guess ill do it but i would like to try it!

93ls7z

iTrader: (2)

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.

johnster

iTrader: (27)

ok man thanks

1CAMWNDR

iTrader: (21)

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.

KCS

iTrader: (20)

Why not? He said it needs a rebuild anyways. Why not go with an additional 5-6ci, unshroud the valves a little more, all while saving a solid $200 or so by reusing some low mile L92 pistons, which are actually really nice.

1CAMWNDR

iTrader: (21)

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.

KCS

iTrader: (20)

Well, I don't think a heads/cam combination is the limit for stock OE pistons. If it were my engine, I'd be comfortable with another 100-150 shot of nitrous before I'd worry about the pistons failing.

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.

bww3588

iTrader: (49)

i see one problem with this, if he buys pistons for stock rods, he cant use them on longer forged rods unless he uses stock length rods and a stock length stroke. if he puts a stroker crank in, you have to use longer rods for clearence reasons.

1CAMWNDR

iTrader: (21)

Yeah, that is a draw-back, bit I did note in my above post he would need to find some forged 6.100" rods. That was assuming he might not be able to buy a whole new rotating assembly in the future either.

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.