from wikipedia it says

2UR-GSE

The 2UR-GSE is a 5.0 L; 303.2 cu in (4,969 cc) naturally aspirated V8 engine fitted to the IS F, RC F, GS F, LC 500, and IS 500.

but it says


Applications:

• 2007–2014 Lexus IS F (USE20)
• 2015–present Lexus RC F (USC10)
• 2015–2020 Lexus GS F (URL10)
• 2017–present Lexus LC 500 (URZ100)
• 2022–present Lexus IS 500 F-Sport Performance (USE30)

what does the value in parentheses mean (USC10 etc)

I had an LC way back in 2020, sold due to an offer i couldn't refuse but kind of want another Lexus V8.
now i know the ISF has an older version with about 50 less hp. but what about 2015+? let's say down the road i need parts or even an engine are all of them interchangeable? could theoretically you put an RCF engine in an LC or IS500?

 

The codes in parentheses (USC10/URL10/etc) is the vehicle chassis codes. I'm assuming the leading 'U' in all of them mean it's the V8 version. Pure guess though, mainly since I know the codes for RCnn0 models are ASC10 or GSC10 depending on engine option.

The 2UR in the RCF, GSF, and IS500 should be interchangeable. The intake system is totally different on the LC500, but not sure if anything differs on the blocks themselves. ISF was the original and there were many internal changes for the later RCF.

 

One thing I've learned from owning Toyota products since forever is the parts were never an issue. In most cases, you will get it in 24-hr or a few days if it's really uncommon. We're not talking LFA stuff here.

I don't know about other manufacturers but it took 2 weeks when I had to order a few clips for a Honda Accord way back when. Totally different than the way Toyota handles their spare parts.

 

Here's someone who put an RCF engine into an ISF:

https://www.clublexus.com/forums/is-...gine-swap.html

 

When the RCF was developed in 2013 - 2014, almost all of the 2UR engine was re-designed except the lower end block. The first generation was in the ISF and the RCF onwards are all the 2nd generation 2UR. The ISF and RCF 2UR (and subsequently, inherited in the GSF, LC and IS500) are essentially different engines. The internals, parts etc. are all different. It was converted into a more free-revving and high engine speed concept engine with a much higher compression. I believe, it was only not renamed to a different engine code due to a technical limitation in Japan, but it is essentially a different engine.

From the RCF press release, here are all of the re-design elements:

The F Strikes Again: Lexus Unleashes the 2015 RC F, A 467 hp Firestorm on Forged Alloy Wheels - Lexus USA Newsroom

New or redesigned parts include:

• Cylinder heads and cam covers
• Crankshaft: crank pin diameter, connecting rod big-end bearing size and crank counter-weight size are all reduced, to reduce reciprocating weight
• Crank main bearings and caps
• High-strength forged connecting rods
• Pistons and piston rings
• Titanium inlet and exhaust valves
• Intake manifold and throttle body
• Redesigned Variable Valve Timing-intelligent Electric motor (VVT-iE)
• Revised Lexus D-4S dual injection system
• Four-into-one exhaust headers and heat insulators
• Oil pan and baffle plate
• Alternator clutch system
• Engine and transmission oil coolers
• Spark plugs
• Redline raised to 7300 rpm.

Digging Into the Metal

• The new cylinder heads improve the 2UR-GSE engine’s breathing with improved porting and a high-flow/high tumble ratio. In addition, intake surge-tank capacity has been optimized, as have the intake manifold runner length and diameter.
• The new oil pan baffle shape reduces agitation and hence friction, while new air-to-oil coolers for the engine oil and transmission fluid increase track suitability.
• The Lexus D-4S dual-injection system has been redesigned, with higher injection pressure of 2,611 psi and improved fuel atomization.
• The throttle diameter was increased by 10 percent, from 3 to 3.3 inches (84 mm).
• A new intake camshaft profile increases valve lift and suits the Atkinson cycle, while improvements to the electronic VVT-iE system have expanded its range of operation for increased fuel economy and performance.
• New four-into-two exhaust headers help reduce interference and hence further improve engine breathing. The larger-diameter exhaust system is designed to reduce backpressure and sound amazing, especially under acceleration. At the same time, the main muffler keeps things from getting too rowdy at lower speeds.
• As a final touch, the new 2UR-GSE engine has a one-way clutch on the alternator pulley.

 

that makes sense so it seems the RCF was the redesign and it's the same between RCF, GSF, LC500, IS500

 

Pretty much. LC500 has a slightly different variation of the engine, but the other 3 have the identical engine.
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what exactly is different with the LC500 engine?

 

Software tune is different (makes a bit less HP, but more torque) and also has dual intakes (one on each side) rather than one in the other three variants.