A few years ago stroker motors weren't very reliable but with testing and redesigning now they are almost as reliable as a stock motor as long as you treat them right.
A stroker kit increases an engine's displacement by lengthening the stroke of the piston. In a kit will be bespoke engine components altered from OEM parts to achieve this increase in stroke. They allow the piston to travel further up and down the cylinder thanks to the use of a different crankshaft.
We've found that larger port volumes might add 15-20 hp in the types of engines we build. Valve size has a much more dramatic effect. Installing the largest valves possible could increase power by 50-plus hp.”
Re: Building a 383 Stroker, costs and challengesYou can put a 383 together to handle about 400-450 horses for probably $1500-$1600. That would be a short block. It's probably possible to build it for around $1200 everything off a 400 and 350 except for new pistons, rings, and bearings.
GM 496 Stroker Base Engine Aluminum Heads Roller Cam HP & Torque: 575 HP / 570 FT LBS - American Powertrain.
Overall, the 400 SBC is a really good block. They do come with a bit shorter connecting rods (5.565" compared to 5.700" for the 350) than do most of the other SBC engines out there.
Reported Performance RangeThe GM ZZ383 Performance engine has 425 horsepower and 449 foot-pounds of torque. Other 383 stroker engines have been reported achieving 330 horsepower with 420 foot-pounds of torque, 395 horsepower with 410 foot-pounds of torque and 395 horsepower with 410 foot-pounds of torque.
A 383 is a stroked 350 so the block will still look like a 350 block and have the same numbers. The only way that I know of for sure is to look at the bottom end of the engine. It will have to be ground for clearance and it might have markings on the crank if they used an aftermarket crank.
#10 – Jeep 4.0L Straight-SixThis little engine that could is best known for reliably powering a variety of Jeep utility vehicles from 1986 through its phase out in 2006.
Provided that it really does get taken care of and driven normally, It is safe to say around 150000, but you can expect more than that in MOST cases. I personally have a 93 YJ with the 4.0 in it and its kickin along great at 135000 miles.
The Jeep 4.0L I-6 is extremely reliable. If you Googled that engine, or went onto various Jeep forums, you'd be hard pressed to find one that died after any number of miles - providing it was properly serviced during its life.
The 3.8 is a reasonable engine that gets the job done until you start adding big tires, lift kits, armor, etc which demand more power. At that point it becomes pedestrian at best. It didn't have many bugs or ponies to speak of.
Actually the 3.8L is a very reliable engine. Chrysler ran the engine for over 20 years for a reason. The only problem with the 3.8L was it was paired with a Automatic transmission that wasn't getting it into the right power band for a heavier JK and especially JKU. Once regeared it solved that issue.
The stock 4.0L rods can easily handle 400+hp and 6000+rpm. Other components in a stock 4.0L engine are likely to fail (e.g. snapped timing chain, cracked crankshaft rod journals) before the stock rods or rod bolts, and the stock composite head gasket will fail if subjected to more than 8psi of boost.
The 2.5L in my Jeep has been extremely reliable. It's got about 160k and many of those miles are hard. It has seen more off-road hill climbs near or on the rev limiter in the past 10 years than I can even begin to explain.
The automatic 4cyls are very underpowered. In stock for a 4cyl will be fine, although don't expect to get there fast, highways are not fun even mild 31" tires. If you plan to lift, or go larger than 30" tires you will need to regear to keep it useful in on road driving.
Because having all six exhaust ports on the same side of the engine means they can be merged together in a way that neatly separates the exhaust 'pulses' from each cylinder, something that's harder to do on a V6 (but not impossible). Result: sonic bliss for straight-six performance cars.
The 87 to 90 4.0 had a Renix FI system. The 91 through 95 was considered the High Output (HO) and was a Mopar designed EFI. The Renix uses a lot more sensors, has lots more wires, uses an EGR valve, has a smaller throttle body, and a less efficient intake manifold.
Not all 4.0 engines are the same even after 91 and up. You should be ok with the 99Cherokee to 99 Grand Cherokee swap though. Be careful, many people assume that they are the same but they are not.
So dust off that credit card and upsize your power without upsizing your engine.
- Cold Air Intake. The factory filter and air box offers a slight restriction in intake air flow.
- 62mm Throttle Body.
- High Performance Ignition.
- Header.
- After-Cat Exhaust/High-Flow Cat.
- More Fuel.
- Electronic Tuners & Tricks.
The straight cylinder configuration reduces the need for balancing components, reducing the mechanical complexity of the engine. Inline car engines suffer from relatively small amounts of unwanted vibration at typical engine speeds, and the long stroke of their cylinders gives these engines superior torque.
a good rebuild should be at least 1300 if you're expecting any quality. i found a shop that would rebuild mine for 1000 but i found a review online that said they started getting engine problems 30K after the rebuild. You could look for a low mileage junkyard engine, that should run around $500.
A Tribute to the “Straight Six”: Jeep's Legendary 4.0L In-line Six Engine. Classic Jeeps like the Jeep Cherokee are some of the few older vehicles still in high demand today. But the final, and most important reason that these jeeps are so coveted, is the 4.0L in-line “straight six” AMC engine.
Along with the British Ford Essex V6 engine and the U.S. Buick V6 and GMC Truck V6, these were among the first mass-produced V6 engines in the world. Throughout its production run, the Cologne V6 has evolved from the engine displacements of 1.8, 2.0, 2.3, 2.4, 2.6, 2.8, 2.9, and 4.0 litres engines.
The 232 has a shorter stroke than the 258. They are otherwise identical. The longer the stroke, the lower RPM the torque peak occurs - in general. Horsepower is roughly proportional to displacement.
An older, decently cared for Jeep Wrangler can last up to 200,000 miles meanwhile, a Jeep Wrangler in perfectly good condition with frequent maintenance can last up to 400,000 miles. The numbers depend on how well you take care of it!
