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- USA
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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
**In Stock** 650hp LS3 Forged Naturally Aspirated Engine | Long MotorIn Stock LS3 377ci Forged High Comp Race Engine Long Motor Our LSX Performance Parts Custom built LS 377ci LS3 Forged Engine is built with a purpose To produce the highest performing N A stock stroke package to suit your race needs. This engine package is perfect for racing categories that hold cubic inch & stroke limitations such as improved racing IPRA and similar. We have developed and tested this combo to produce proven race winning results to
In Stock LS3 377ci Forged High Comp Race Engine | Long MotorOur LSX Performance Parts Custom built LS 377ci LS3 Forged Engine is built with a purpose - To produce the highest performing N/A stock stroke package to suit your race needs.
This engine package is perfect for racing categories that hold cubic inch & stroke limitations such as improved racing IPRA and similar.
We have developed and tested this combo to produce proven race winning results to keep your motorsport program competitive, reliable and low maintenance!
We only use the best products on the market that have been tried, Tested & Proven to produce the results that our customers expect.
All internals are of the highest quality American Forged steel & all fasteners are the one & only ARP.
Your New LS3 377ci Forged Engine Package Includes
- GM LS3 6.2 Aluminum Engine Block;
- Stock Stroke 3.625" Inch Crankshaft | 58x Reluctor;
- Manley Forged H beam Conrods | 6.125" Inch;
- Carillo Bullet Dome Top Pistons Set | 4.070" (.005" Thou Oversized);
- Clevite Race Series Conrod Bearings;
- Clevite Race Series Main Bearings;
- Coated Cam Bearings;
- Custom Grind Hydraulic Roller Naturally Aspirated Camshaft;
- Billet Double Row Timing Chain Set;
- Melling High Volume Oil Pump;
- GM LS7 Lifters Set;
- Lifter Guides & Bolts;
- MLS Head Gaskets Set;
- Head Bolts Set;
- Chromoly Pushrods Set;
- LS3 Cylinder Heads;
- CNC Ported Intake Runners;
- CNC Ported Exhaust Ports;
- CNC Ported Combustion Chambers;
- Machined Deck Surfaces;
- .660" Lift Dual Valve Spring Kit;
- LS3 Intake & Exhaust Valves;
- CHE Rocker Trunnion Bearing Upgrade;
- ARP Cam Bolts;
- ARP Harmonic Balancer Bolt;
- ARP Oil Pump Bolts;
- Oil Pick Up Support Bracket;
- GM LS Timing Cover;
- GM LS Rear Plate;
- Block Deck Machined To Zero Deck Height;
- Cylinder Bores CNC Machined & Torque Plate Honed;
- Align Hone Main Tunnel;
- De-Burred Oil Galleries;
- Stroker Clearance Bores;
- Balance Rotating Assembly;
- Blueprinted Bearing Clearances;
- Dummy assembly;
- Final assembly;
Want To Speak To Us About Your New Engine Package?
Sure! Give us a call on
(03)8595 4343
OR Simply click
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& schedule a time that best suits you. We will have one of our sales consultants contact you at your convenience.
Alternatively, We are available for live chat NOW.
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Shop with confidence with free freight Australia wide & discounted pricing.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 819 reviews
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Product Reviews
★★★★★ 5
Klipsch R50 M next generation
Size: 5.25” Woofer
In spite of small size sound is very nice iam using it with a subwoofer and with my yamaha A4A AV receiver i like it iam hearing mostly heavy metal and the speakers have a nice punch and attack
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Reviewed in the United States on February 18, 2026
★★★★★ 4
compact surrounds that blend well with the right setup
Size: 4” Woofer
I picked up the Klipsch R‑40M as part of a full 5.1 system built around the R‑50M fronts and the R‑50C center. My original plan was to use another pair of R‑50M speakers in the back, but they simply didn’t fit in the rear cabinet space I have. The R‑40M ended up being the only model that fit comfortably, so they became my surround channels.
In terms of build quality, they feel solid and consistent with the rest of the Reference Next‑Gen line. The copper woofers and updated horn design give them the same visual identity as the larger models, which helps the whole system look cohesive. They’re compact enough to place in tighter spaces without compromising too much on performance.
Sonically, the R‑40M does a respectable job as a surround speaker. Effects are clear, directional cues are easy to follow, and they integrate smoothly with the more powerful R‑50M fronts. That said, they are noticeably less powerful than the R‑50M, so you need to spend a little time balancing your levels. Once I bumped their channel trim a bit and adjusted the distance settings, the rear soundstage locked in nicely and felt much more even.
They won’t deliver the same fullness or dynamic punch as the larger models, but for rear channels that’s usually not a deal breaker. What matters is clarity and consistency, and the R‑40M handles both well. Movies with active surround mixes feel immersive, and ambient effects wrap around the room without calling attention to the speakers themselves.
If you’re building a system where space is limited in the back, the R‑40M is a practical and capable choice. Just be prepared to fine tune your calibration so they match the output of the bigger speakers up front. Once dialed in, they round out a 5.1 setup very effectively.
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Reviewed in the United States on January 22, 2026
★★★★★ 5
Great Bang for the Buck!
Size: 5.25” Woofer
These R50 Studio Monitors are worth every penny. One could easily spend a heck of a lot more to get less. Have been a pro audio engineer my entire life. These monitors kick out clean, solid bass and accurate highs. Klipsch did a excellent job designing these monitors. Perfect for smail spaces where fidelity is critical. If you wall mount these, make sure you leave at least a 1.5 inch air gap between the back of the monitor and the wall. These units are sweet.
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Reviewed in the United States on July 22, 2025
★★★★★ 5
Worth the price
Size: 5.25” Woofer
I had in ceiling front speakers and went with these instead. The front ceilings are now height speakers. Sounds great now.
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Reviewed in the United States on January 23, 2026
★★★★★ 5
Small but mighty
Size: 5.25” Woofer
Great sound. I can turn my stereo up loader than I care to listen to it and notice no distortion.
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Reviewed in the United States on April 20, 2026