What is the biggest engine I can fit into my truck?

My question is what is the biggest engine I can fit into my truck 91 chevy silverado c1500 extended cab

My car has 300000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello – GM big block (454 cu in) swaps are common, bigger (i.e. more cubic inches) engine surpass 572 with the same physical block configuration, and are available as "crate" motors, order it and drop it in. Speed cost $$$ – how fast do you want to go?

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2022 Chevy Silverado 1500 6.2L V8

The conventional trailering capacity of the 6.2L V8 is the highest of any Silverado 1500 gasoline engine, at 13,300 pounds when properly equipped.

The 7.3L OHV PFI gas V8 engine in the 2022 Ford Super Duty® is the most powerful gas engine in a full-size pickup and the largest V8 in its class, with the best gas horsepower and torque in its class to prove it. The top-of-the-line gas engine generates best gas torque in its class of 475 lb.
Chevrolet C/K 1500

Two trim levels were offered: Cheyenne and, as mentioned, Silverado. Silverado models generally included upgraded cabin trim, better audio systems, and additional exterior trim. In addition to the three engines listed above, a 230-horsepower 7.4-liter V8 came standard in the sporty 454 SS.

The test model came with an optional 5.7-liter V-8 engine rated 210 horsepower at 4,000 rpm with a maximum torque of 300 foot-pounds at 2,800 rpm. The standard K1500 engine is a 4-liter, 165-horsepower V-6. Braking was excellent, with included power front discs/rear drums with anti-lock backup.
Moveras – 4L60 – Transmission (Part No.
5.3-Liter V-8: 355 HP/383 LB -FT

The traditional and most popular engine choice for the Chevrolet Silverado pickup truck is, of course, a pushrod small-block V-8 with variable valve timing and cylinder deactivation.

The 5.7L LS1 V8 engine was produced by General Motors for use in high-performance vehicles such as the Chevrolet Camaro and Corvette, among others. It is part of GM`s Gen III Small Block engine family. Displacement: 5.7L / 346 cu.
In the vehicle, it`s more of a matter of “gearing” than revs. A 327 with it`s shorter stroke would need shorter gears so it can GET to its revs, where a 350, with its slightly longer stroke and more torque output will pull a little taller gear than the 327 will.
You can either swap another engine that`s designed to work in the car you have, or you can swap in one that`s totally different. As you might imagine, swapping in a completely new engine is way more difficult than putting in a manufacturer approved alternate engine.
2023 Ram 1500 TRX

With 702 horsepower from a supercharged 6.2-liter V8, the new Ram 1500 TRX is the fastest gas-powered production truck on our list.

The new 6.2-liter EcoTec3 V8 option is the best engine for a Chevy Silverado, that is if you`re focused on horsepower and torque.
The new Chevrolet Performance ZZ632/1000 DELUXE Big-Block Crate Engine is no exception. It`s our most powerful crate engine ever, with the modern convenience of EFI technology, providing more than 1,000 horsepower on 93-octane pump gas.
The Chevrolet Silverado has a top speed of 114mph, a notable speed for a truck of this size. The Silverado is ready to demolish its competitors in multiple ways, from its sharp performance to its steady endurance.
Backed by a 36 month or 100,000-mile limited warranty, our factory O.E. 5.7 can give a new lease on life to that old friend. With all-new components and modern updates, this General Motors Gen 1 350 V8 puts out a reliable 210 hp and 300 lb. -ft. of torque at a work-friendly 2,800 rpm.
This 5.7L GOLD package is rated at 315 hp @ 5000 RPM at the crank and will fit, bolt in, and work in nearly all 5.0L & 5.7L marine applications from 1986-Current with no modifications.
The key distinction of the 700R4 / 4L60 / Early 4L60-E (from the Later 4L60-E) is the four bolt rear output or tailhousing / adapter pattern. The Later 4L60-E has a six bolt “hex” rear bolt pattern and a removable bellhousing. There are three main castings of the 700R case.
The TH700R4 was renamed “4L60” (RPO MD8) following the new General Motors naming convention when the electronic version, 4L60E (RPO M30), was phased in as the 4L60 was being phased out. This happened in 1993 for trucks, vans, and SUVs, and 1994 for rear wheel drive passenger cars.
HM290 Manual Transmission for GM 1993-1995 1500 And 2500 2WD 5 Speed.
On average, the Chevy Silverado 1500 will last around 200,000 miles.
Straight out of the gate, the Chevrolet ZZ632 produces a whopping 1,004 hp and 876 lb-ft of torque, relying on good ol` displacement. As a result, the ZZ632 crate engine is the most powerful in the Chevrolet Performance parts catalog. Furthermore, it`s one of the world`s most potent naturally aspirated engines.
6.2-liter EcoTec3 V8

A stronger version of the 5.3-liter V8, the 6.2-liter engine puts out 420 horsepower and 460 pound-feet of torque.

This engine is found in a variety of Chevy vehicles, including the Silverado, Tahoe, Suburban, and Avalanche. The 5.3 liter engine is a V8 engine that offers good performance and fuel economy.
6.2-liter EcoTec3 V8

A stronger version of the 5.3-liter V8, the 6.2-liter engine puts out 420 horsepower and 460 pound-feet of torque.

What is the 6.2L Chevy engine? The 6.2L (376 ci) Chevy engine is one of Chevy`s most powerful engines. This advanced V8 small-block engine has 420 hp and 460 lb-ft. The 6.2L engine uses Dynamic Fuel Management (DFM) to save fuel without diminishing performance.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I parked my truck for 5-10 mins. Tried to turn it on, now it wont start, called a tow tow truck 15-20mins later my truck turned on
ANSWER : It is very likely that you have a powertrain control module failure. This can happen often on many GM vehicles. I would recommend having the powertrain control module tested and replaced as necessary in order to resolve this issue. After the powertrain control module is replaced, a reflash procedure will be required so that the vehicle can relearn all of its primary engine data. Once the reflash is completed, your vehicle should no longer have this issue.

What is the biggest engine I can fit into my truck?
ANSWER : Hello – GM big block (454 cu in) swaps are common, bigger (i.e. more cubic inches) engine surpass 572 with the same physical block configuration, and are available as "crate" motors, order it and drop it in. Speed cost $$$ – how fast do you want to go?

Check engine light
ANSWER : Hello,
This kind of condition could be related to other things such as faulty fuel injectors, a faulty or dirty mass air flow sensor, or potentially a fuel pressure problem related to the fuel pump or fuel pressure regulator. The original diagnosis of the oxygen sensor being faulty would have been the initial correct approach, however the oxygen sensor may have been properly reading an abnormal fuel condition that is actually causing the rough idle. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

I have a 2010 camry. I just recently replaced the engine with a 2014 camry engine. Now I have Four engine lights on. I replaced on
ANSWER : If you swapped the engine from a vehicle that is 4 years newer than the car is then you are going to have electrical and sensor incompatibilities that may not be able to be fixed by just a few sensor replacements. There were many changes in computer and emission related items between 2010 and 2014 engines. I would recommend having a mechanic like one from YourMechanic come to you and compare the two engines to isolate the possible differences and see if the problem can be fixed.

Truck has trouble starting, idle’s too low, losing power, check engine light is on.
ANSWER : You may want to try and run some combustion cleaner into the intake. You can get the good cleaner from any Ford parts store. You use a small rubber hose and allow it to get sucked into the engine slowly and then let the engine sit for about 30 minutes then run a second can into the engine until it is gone and shut off engine and let sit 30 minutes. Start and rev the engine several times to loose any loose carbon and burn off any excess. This may increase the compression and help the valves seal better. It should help with the hard start also. If you need some assistance with this or the problem continues to persist, consider YourMechanic, as a certified technician can come diagnose your starting problem for an accurate repair.

My truck threw a rod, should i consider a crate engine to replace it with, or just a regular engine.
ANSWER : The question you should ask yourself is how much of a budget you are having for your vehicle. The difference between a crate engine and a new engine is that the crate engine will come with all of the parts including the intake and exhaust manifolds as it is used to swap out directly with the vehicle. Usually this is very costly. New engines come with long blocks (block and cylinder heads) and short blocks (just the lower end block) but nothing else. A remanufactured engine will be the same as a new engine but some parts (the camshaft and crankshaft) may be reused but ground down to clean up any old used parts. I recommend that you decide on what you want based on price and warranty that an engine specialist will offer. I recommend seeking out a professional, such as one from Your Mechanic, to help you decide on which engine you would like if you are unsure.

How do you replace the rear & side engine mounts without lifting out the engine? & how do you lift the engine out?
ANSWER : Hi…thank you for your questions. If required in the application, a portable engine support bar is used to support an engine during mount replacement. The support bar has lifting capability as well so that the mount can be unloaded and removed. If a particular repair application requires a "crane" (complete engine removal for instance), such are portable these days in any event. With regard to the exhaust system repair, mechanics use ramps to gain access. Six ton portable jack stands will safely support a car two feet into the air which provides more than enough access to repair or replace any exhaust system component. If you desire replacement of the mounts, please refer to YourMechanic’s motor mount replacement service page. For exhaust leaks, please use the exhaust system inspection/repair page page. Once on each of those service pages, if you click on "Get a Quote" and enter your vehicle information (year, make, model) you can obtain cost info and schedule the service. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.