Standard Bore LS6 Shortblock 3963512 Pad T0522CRR

**SuperNovaSS** · #1 03-04-2014, 12:24 AM

This is a standard bore LS6 shortblock that recently came out of an old hotrodder's garage where it had been since the late 70's. The details on the shortblock were faint after all these years. He said it came out of an old Chevelle but I would bet it was originally a boat engine. It looks like the timing chain broke or skipped a tooth or two as there are marks from the valves hitting every piston. There is one piston and rod missing and that cylinder needs a sleeve due to a crack as shown. The other cylinders are standard bore with no ridge. I imagine with a sleeve and replacement piston and rod, this block could stay standard bore.

The block casting number is 3963512 and the casting date is E 13 71. The pad stamp is T0522CRR and there is no VIN stamping. The crank is the very hard to find 3521 unit which is usually reserved for the LS7 only.

This would be great for a replacement engine or hot rod.

$1750 for the shortblock as shown. I can palletize and deliver to a nearby freight carrier for those far away.

Thanks,

Jason

**SuperNovaSS** · #2 03-04-2014, 08:52 PM

I think I may have overshot the price on this. It is a real 4 bolt 512 block but does need repair.

I will go for $1500.

I will keep it for sale for a week or two before taking to the machine shop. I thought someone may want to have their own machine work done by the shop they trust rather than have a block that is already sleeved.

Thanks,

Jason

**luzl78** · #3 03-04-2014, 10:03 PM

Jason, are the cracks repaired before the sleeve is installed or just left alone without worries?

**SuperNovaSS** · #4 03-04-2014, 11:02 PM

I'm not sure. I would have to ask the machine shop but I believe the crack is left there.

Jason

**69 Post Sedan** · #5 03-04-2014, 11:41 PM

I just talked with an engine builder. He said they leave as much of the existing cylinder as possible and press the new one in. He leaves the crack alone.

Kurt

**luzl78** · #6 03-04-2014, 11:50 PM

Thanks Kurt.

**luzl78** · #7 03-04-2014, 11:52 PM

If I don't buy this block I have a pair of nos 990 ls7 heads if someone wants some breathable heads.

**SuperNovaSS** · #8 03-05-2014, 02:45 AM

Thanks Kurt,

I thought that was the case but didn't want to say so without confirming.

Jason

the427king · #9 03-05-2014, 02:48 AM

There is no way to repair the cracks except to sleeve

**SuperNovaSS** · #10 03-05-2014, 02:58 AM

I think what he was asking was whether the crack was dealt with in any way after the block was bored for the sleeve but before the sleeve was installed.

Jason

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