If you've spent any moment checking junkyards or scrolling through Facebook Industry for a project engine, you've definitely run into the chevy 880 block . It really is one associated with those legendary pieces of iron that engine builders love to talk about, mostly since it offers a large amount of contemporary convenience without the particular massive price tag of a dedicated aftermarket racing block. Theoretically known by the full casting number, 10243880, this block was the anchor from the late-model three hundred and fifty Vortec engines discovered in countless GM trucks and Sports utility vehicles from roughly mil novecentos e noventa e seis to 2002.
For a lengthy time, the old-school guys tied to the pre-1986 blocks due to the fact that was what they knew. But truthfully, if you're building a street machine or perhaps a solid weekend warrior today, the chevy 880 block is arguably a far greater starting point. It's the last evolution of the original Little Block Chevy (SBC) architecture before the LS motors took over the world, and this incorporates some of the best factory upgrades GM ever came up with.
What Makes the 880 Casting So Particular?
The very first thing individuals usually mention about the chevy 880 block will be the "high nickel" content material myth. You'll hear guys at change meets swear down and up that these blocks possess a higher focus of nickel and tin, making the cylinder walls more difficult and less susceptible to wear. While there is lots of debate among machinists about whether the particular alloy is in fact different from earlier castings, the truth is these hindrances tend to keep their shape exceptionally well. Even after 200, 000 kilometers within a work pickup truck, it's common in order to pull one aside and still view the factory hone scars on the cylinder walls.
Over and above the metallurgy, the real magic is in the functions. The 880 is really a "roller block, " meaning it originated from the factory machined for a hydraulic roller camshaft. In case you've ever attempted to convert a good older flat-tappet block to a roller setup, you understand it can end up being a pricey head ache involving expensive link-bar lifters. With the chevy 880 block , you just make use of the factory "spider" holder and dogbones, that allows you to run a modern, intense cam profile with out worrying about wiping lobes during break-in.
The One-Piece Rear Main Close off Advantage
One of the greatest quality-of-life improvements with the chevy 880 block is the one-piece rear primary seal. If you've ever dealt along with the old two piece seals on 327s or early 350s, you know these people are notorious for leaving little essential oil spots on your own entrance no matter how carefully you install them.
The one-piece design around the 880 block is much more reliable and easier to install. It also means the particular crankshaft has a different bolt pattern intended for the flywheel or even flexplate. Could indicates you can't reuse your old 1971s crank, it's a small price to purchase a dry garage floor. Most modern stroker kits are specifically designed for this one-piece seal set up anyway, so locating parts is by no means an issue.
2-Bolt vs. 4-Bolt Mains: Which One particular Are you experiencing?
This particular is where the particular chevy 880 block gets fascinating. Depending on what vehicle the engine came out of, you might find either a 2-bolt or a 4-bolt main bearing setup. In most cases, if the block left a 3/4-ton or even 1-ton truck (like a Chevy 2500 or 3500), it's almost certainly the 4-bolt main. If it came out of the 1500 Tahoe or even Silverado, it's likely a 2-bolt.
Now, don't let a 2-bolt main scare you apart. For a street-driven car making four hundred or even 400 horsepower, a 2-bolt chevy 880 block is lots strong. Actually, a lot of builders choose the 2-bolt blocks simply because they can have them precision machined for splayed 4-bolt aftermarket caps, which is actually stronger compared to factory straight 4-bolt design. But in case you're looking for the easiest path to a stout underside end, hunt with regard to the 4-bolt version in the heavy-duty vehicle sections of the backyard.
Building the Stroker on an 880 Foundation
The chevy 880 block has become the almost all popular choice regarding building a budget-friendly 383 stroker. Mainly because these blocks are so common plus relatively "modern" with regards to manufacturing tolerances, they normally are in great form when you encourage them to the machine store.
When you're building the 383, you're shedding in a several. 75-inch stroke turn, which usually demands some clearancing at the bottom from the cylinder bores. The 880 casting provides plenty of meats within the right areas, causeing this to be a straightforward job for any kind of competent machinist. Set that bottom end with the Vortec heads that usually come on these types of engines, and you have a recipe for huge torque that kicks in right to need it on the particular street.
Points to Watch Out For
No engine block is usually perfect, and the particular chevy 880 block has the quirks. Since many of these resided their lives in trucks that proved helpful for any living, a person really need in order to check for cracks. The most common spot is in the lifter valley or close to the head bolt holes if the engine was actually overheated or in the event that someone didn't drain the water before a hard freeze out.
Also, since they are "Vortec" motors, they use a plastic timing cover along with a built-in crank sensor seal. If you're going to operate an old-school carburetor and a mechanical fuel pump, you'll observe that most 880 blocks do not really have the gap for the energy pump pushrod drilled out. It's just a flat spreading boss. You may have a machinist drill it, although most people simply run an electric powered fuel pump and call it each day. It's way less of a hassle.
Cooling and Head Compatibility
Another thing to keep in mind is the particular cooling passages. The particular chevy 880 block was developed to work with Vortec heads, which have a somewhat different coolant movement pattern than the old "hump" heads through the 60s. You are able to absolutely run older style heads with an 880 block, however you need to make sure you use the right head gaskets to guarantee the coolant goes where it's supposed to.
To be honest, though, the reason why would you want to? The 906 or 062 casting Vortec heads that generally take a seat on top associated with a chevy 880 block are usually some of the particular best-flowing factory iron heads ever produced. Unless you're going with high-end light weight aluminum aftermarket heads, the particular stock Vortec things is hard to beat for the particular money.
Locating Your Own 880 Block
The beauty of the chevy 880 block is that they are just about everywhere. You don't have got to go to a specialized racing shop to find one. Just search for any Chevy or GENERAL MOTORS CO truck from mil novecentos e noventa e seis to early 2002 with the "R" code 5. 7L V8. They are in Express vans, Suburbans, and also some Cadillacs.
When you attend purchase one, bring the flashlight and appear in the back of the block, right where the transmission bellhousing bolts up. For the driver's side ledge, you'll see "880" solid into the iron. If it's there, you've found the golden goose associated with budget engine developing.
Final Ideas
At the particular end of the particular day, the chevy 880 block represents the sweet spot for small-block fans. It gives you the classic look and feel of the motor that built the rod industry, but with the precision and reliability of 90s engineering. It's easy to find, relatively cheap to machine, and it handles modern strength levels without splitting a sweat.
Whether you're trying to build a gentle 300-horsepower cruiser or even a 500-horsepower stroker, starting with an 880 casting is really a smart move. It saves you money on valvetrain parts, keeps your drive clean of essential oil, and offers a rock-solid foundation for no matter what performance goals a person have in brain. Don't let the "truck engine" content label fool you—with the right parts, the particular chevy 880 block can become an absolute beast.