Originally Posted by 92zcamaroperson
Arent the ARP main bolt just stronger than stock ones? Or do you mean main studs? Can you reuse stock main bolts?
I have a shortblock that I just bought with a spun crank bearing. Would it be best for me to just haul it in and let a machine shop handle the dissassembly and reassembly or is it safe enough for me to do. When installing the crank and new bearings do I have to clearence several things or anything?
Yeah, you caught me LOL I meant studs I'll go up and edit that. Ok it spun a main. You can disassemble it no problem, plus it will save you a ton o money. If you haven't torn into a motor before it isn't rocket science. Plus I know I'm more of a visual and hands on type of learner so it will give you a sense of what you are getting into. Tearing it down you don't have to be super careful except for the pistons when you push them and the rods out through the top of the bore so you don't ding up the cylinder wall, but putting back together you got to be for sure.
It will have to be line bored and probiably will have to have a bearing with a larger outside diameter installed to salvage the block. I looked on federal mogul's and clevite's websites and I saw no listing for a bearing like that BUT I know it can be had, your machine shop may have to special order it though. As a kid I grew up on a farm and we had a 1066 Farmall tractor we used ALOT. Tractor spun a main bearing. Getting a good used block was gonna cost about 2k
. What I remember most was splitting that heavy SOB tractor LOL(8500 lbs) in 1/2 to get the motor out. It cost about $800 in parts 10+ years ago to get her back running again (had to oversize the mains like I mentioned) but it's still working away no problems since.
Your main bolts can't be reused. I reused my old bolts and torqued to 55 ft lbs on the inner bolts and 50 on the outer bolts just to plastigauge my mains, but then I replaced them with new bolts once I was certain it was all good. So I wouldn't throw them away but get replacements you will need them. It's about a $70 difference for ARP hardware vs stock stuff. Being it is gonna be line bored anyways that's your call.
Disassembling a LS1 isn't hard at all, just keep stuff in zip lock bags, keep it oily, and keep it all labelled. The parts I would give the shop being your motor had bearing problems is pistons with rods, camshaft (if you have one out of that motor you want to use) crank, and block. Rest of it unless you are gonna have the heads gone over has no real need to go to the shop. Crank unless you are getting another crank will abviously need to be turned .010 under. As for the pistons and rods "sigh" have the big ends of every single rod checked.
This motor had bearing damage and the journals have been heated in a manner which they were not designed. It is entirely possible the rods are fine but while you have it down have them checked. If they are out just get new rods, they are $90 each new and most shops charge close to that to resize them and if you do resize a rod then you are in the boat of having a mismatch of bearings ect ect. If you resize one rod you should do them all. Keep as much of the rotating assembly the same. It will make parts ordering easier and cheaper.
A bearing for a resized rod is gonna be a special order part. If 5 or more rods need resized at that point I'd evaluate exactly what you want with the motor. Putting in forged rods is not much more money at that point in the game, but then you have to replace your pistons or go with a Manley rod on your factory pistons, but why at that point? Would probiably make more sense at that point to find a used rotating assembly on Ebay or something and pickup an entire rotating assembly if you didn't want to get a ton o money into it.
Your machine shop will know, but I'm gonna just say this, you can not put aluminum parts into a normal parts washer. The chemicals in a normal parts washer will pit and eat aluminum. Brakeclean is your best friend. Methanol works great too if you can get your hands on it.
Hopefully this gives you an idea of what you are gonna get into. This isn't everything but it is a good starting point.