Editing Chevrolet big-block engine (section)

==Generation V==
For 1991, [[General Motors]] made significant changes to the big-block resulting in the Generation V. The block received a one-piece rear seal and all blocks received 4-bolt mains. Additionally the main oil galley was moved from near the oil pan to near the camshaft. Also the [[valvetrain]] became non-adjustable and the provisions for a mechanical fuel pump were eliminated. Cast aluminum valve covers were fitted in place of stamped steel covers, featuring a screw-in filler cap.<ref>{{cite web |title=The Novak Guide to the Chevrolet Big Block V8 Engine |url=https://www.novak-adapt.com/knowledge/engines/about/chevy/chevy-big-block-v8/ |access-date=13 June 2017}}</ref> Structural changes were carried out to the cylinder block to improve the integrity of the bores and the inlet manifold was changed to a single-piece design.<ref name=JM2>{{cite magazine | ref = FO857 | magazine = Fleet Owner | title = The New Models for 1991: Medium Trucks | date = July 1990 | publisher = FM Business Publications | volume = 85 | number = 7 | last = Dwyer | first = John J. | page = 84 }}</ref>

===6.0 (L50)===
The {{cvt|366|CID|L|1}} truck engine also received the Mark V updates for 1991.<ref name=JM2/>

===L19===
From 1991, the 454 was updated to the new Gen V block, crankshaft and heads. This engine was rated at 230 net hp, 380 lb-ft net torque, and was discontinued after 1995, with GM coming out with the Vortec 7400 in 1996.

===502===
[[File:Chevy502CID.jpg|thumb|right|200px|The Chevrolet 502 V8]]
[[File:Chevrolet_502_Engine,_Burbank_California.jpg|thumb|left|200px|Chevrolet 502 "Performance Parts" - Burbank California]]
The 502—with a {{cvt|501.28|CID|L|1}} total displacement—had a bore and stroke of {{cvt|4.466x4|in|1}} and a cast iron 4-bolt main block. GM offered it in their Performance Parts catalog, available as multiple [[crate motor]]s with horsepower ratings from {{cvt|338|to|600|hp|kW|0}} and torque of {{cvt|470|to|567|lbft|Nm|0}} in "Base" and "Deluxe" packages.<ref>{{cite web |title=2008 Crate Engine Catalog |url=http://gmperformanceparts.com/_res/pdf/CrateEngineQRC2008.pdf |archive-url=https://web.archive.org/web/20090206165515/http://gmperformanceparts.com/_res/pdf/CrateEngineQRC2008.pdf |archive-date=2009-02-06 |page=25 |access-date=April 3, 2015}}</ref> The "Ram Jet 502,"<ref>{{cite web |title=Ram Jet 502: Outrageous Style and Fuel-Injected Drivability – All with Big-Block Power |url=http://www.chevrolet.com/performance/crate-engines/big-block-ram-jet-502.html |website=Chevrolet |access-date=April 19, 2015}}</ref> the {{cvt|496|hp|kW|0}} / {{cvt|565|lbft|Nm|0}} crate motor, was offered with [[fuel injection]], and came as a [[turn key]] setup which included all the wiring and electronics needed to operate in any vehicle. It was also used in marine applications.

===ZZ572===
General Motors began offering a newly developed {{cvt|572|CID|L|1}} in 1998<ref>{{cite book |last=Freiburger |first=David |title=Hot Rod Horsepower Handbook: Big-Block Chevy |url=https://books.google.com/books?id=Y98Smxj3XREC&pg=PA72 |archive-url=https://web.archive.org/web/20130621012100/http://books.google.com/books?id=Y98Smxj3XREC&pg=PA72 |url-status=dead |archive-date=2013-06-21 |date=2006 |page=72 |publisher=Motorbooks |isbn=978-0760327838 |access-date=April 19, 2015}}</ref> to the aftermarket via its GM Performance Parts division. This engine has a bore and a stroke of {{cvt|4.56|x|4+3/8|in|1}}. This is a {{cvt|620|hp|kW|0}} and {{cvt|650|lbft|Nm|0}} version, designated ZZ572/620 Deluxe, capable of running on 92 octane pump gasoline for street applications.<ref>{{cite web |title=ZZ 572/620 Deluxe: Our Most Powerful Big-Block Street Engine |url=http://www.chevrolet.com/performance/crate-engines/big-block-zz-572-620.html |website=Chevrolet |access-date=April 19, 2015}}</ref> Another version of the same engine is available as a high compression variant, codenamed ZZ572/720R Deluxe, generating a minimum of {{cvt|720|hp|0}} on high-octane racing fuel.<ref>{{cite web |title=ZZ 572/720R: Our Baddest, Most Powerful Big-Block Engine is Ready for the Strip |url=http://www.chevrolet.com/performance/crate-engines/big-block-zz-572-720-r.html |website=Chevrolet |access-date=April 19, 2015}}</ref> The 572 is officially offered by Chevrolet for the 2022 model year COPO Camaro.<ref>{{cite web|url=https://media.chevrolet.com/media/us/en/chevrolet/home.detail.html/content/Pages/news/us/en/2021/jul/0730-copo.html|title = Chevrolet COPO Camaro Brings Back the Big Block for 2022|date = 30 July 2021}}</ref><ref>{{cite web|url=https://www.hotcars.com/the-chevy-bigblock-v8-returns-on-the-2022-copo-camaro/|title = The Chevy Big-block V8 Returns on the 2022 COPO Camaro|date = 31 July 2021}}</ref><ref>{{cite web|url=https://www.caranddriver.com/news/a37182804/2022-chevy-copo-camaro-revealed/|title=2022 Chevy COPO Camaro Revealed with 9.4-Liter, 572-Cubic-Inch V-8|date=31 July 2021}}</ref>

===ZZ632===
In 2021, [[Chevrolet Performance]] presented the largest and most powerful crate engine in the brand's history—the ZZ632/1000 crate engine. It is a [[naturally-aspirated]], {{cvt|632|CID|L|1}} V8, producing {{cvt|1004|hp|0|lk=on}} and {{cvt|876|lb.ft|0|lk=on}} of torque.<ref>{{cite web|url=https://www.motortrend.com/news/chevrolet-performance-1000-hp-zz632-crate-engine/|title=Biggest Crate Engine Ever! Chevy Performance Launches 1,000 HP ZZ632 Big-Block|date=20 October 2021}}</ref> The motor itself weighs {{cvt|680|lb}}.<ref>{{cite web |url=https://www.karlkustoms.com/product/chevrolet-performance-zz632-1000-crate-engine/ |title=Chevrolet Performance ZZ632/1000 Crate Engine |publisher=KarlKustoms.com |date= |access-date=2022-04-11}}</ref>

According to Russ O'Blenes, the GM director of the Performance and Racing Propulsion Team, the ZZ632 is the "biggest, baddest crate engine we've ever built. [It] sits at the top of our unparalleled crate engine lineup as the king of performance. It delivers incredible power, and it does it on pump gas."<ref>{{cite web|url=https://media.chevrolet.com/media/us/en/chevrolet/home.detail.html/content/Pages/news/us/en/2021/oct/1020-crate.html|title = Chevrolet Performance Unveils Its Largest, Most Powerful Crate Engine Ever|date = 20 October 2021}}</ref>

The big-block V8 reaches peak power at 6,600&nbsp;rpm, and revs to a recommended maximum of 7,000&nbsp;rpm. Fuel is delivered through eight-port injectors, with the engine breathing through CNC-machined high-flow aluminum cylinder heads featuring symmetrical ports. While big-blocks have usually been designed with variations in port shape from cylinder to cylinder, all eight intake ports of the ZZ632 have the same volume, length, and layout. Furthermore, all of the ZZ632's exhaust ports are identical. This arrangement guarantees all individual cylinders produce similar power.<ref>{{cite web|url=https://www.motorauthority.com/news/1133914_chevy-unveils-biggest-most-powerful-crate-engine-to-date|title = Chevy unveils biggest, most powerful crate engine to date}}</ref>

These RS-X symmetrical port cylinder heads are named for powertrain engineer Ron Sperry, who designed them as one of his final accomplishments in more than 50 years working on General Motors performance and racing engines. Sperry also introduced symmetrical ports to Chevy's iconic small-block V-8, with the Gen III [[General Motors LS-based small-block engine|LS1 engine]] that debuted in the 1997 [[Chevrolet Corvette]].

The ZZ632's iron block shares a mold with Chevrolet Performance's ZZ572 crate engines, but the castings are machined to accommodate the huge 632 cubic-inch displacement. The bore grows by {{cvt|0.040|in|1}}, compared to the 572-cubic-inch V8s, with most of the displacement gain coming from a stroke that is {{cvt|0.375|in|1}} longer. To provide clearance for that long-stroke, engineers modified both the block and the connecting rods. Four-bolt main caps and a forged rotating assembly assure strength and durability. During development, a single engine endured more than 200 simulated drag strip passes on a dynamometer.

The ZZ632/1000 crate engine was slated to be on display at the November 2021 [[SEMA (association)|SEMA Show]] in Las Vegas. Chevrolet Performance dealers were to begin deliveries in early 2022.<ref>{{cite web|url=https://www.roadandtrack.com/news/a37990530/chevy-1004-hp-crate-motor-zz632-1000/|title=Chevy Has a New 10-Liter Crate Motor That Makes 1004 HP|date=20 October 2021}}</ref>