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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4
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Description
CNC Ported | GM LS3 Port Cylinder Heads | 12675871-CNCWhen it comes to LS Performance, Who knows the industry better than GM Performance. We have now paired he most tried and tested production cylinder head on the market with the race winning experience of our industry leading CNC Cylinder Head machining team. It's no secret that CNC Porting the GM LS3 Cylinder Head is the best way to maximize efficiency & flow from your cylinder head. By combining our CNC Ported LS3 heads with the right camshaft &
When it comes to LS Performance, Who knows the industry better than GM Performance.We have now paired he most tried and tested production cylinder head on the market with the race winning experience of our industry leading CNC Cylinder Head machining team.
It's no secret that CNC Porting the GM LS3 Cylinder Head is the best way to maximize efficiency & flow from your cylinder head. By combining our CNC Ported LS3 heads with the right camshaft & engine engine combination you have a recipe for success.
What Is Included with Our CNC LS3 Heads?
- Genuine GM LS3 Cylinder Head Castings;
- 2.165" Hollow Stem Intake Valves;
- 1.590" Stainless Steel Exhaust Valves;
- CNC Ported Intake Runners;
- CNC Ported Exhaust Ports;
- CNC Machined Deck Surfaces;
Want Our CNC LS3 Heads with a Dual Spring Kit?
- PAC 1905 .660" Dual Valve Springs;
- Chromoly Retainers;
- PAC Valve Locks;
- Valve Stem Seals;
- Locators;
Want To Do A Changeover On Your Existing Heads?
Sure, we now offer a changeover program where you can send back your original heads & receive a cash back on them upon receiving them.
NOTE: We do not accept aftermarket, damaged or cracked castings.
Prefer To Chat With Us About Your Cylinder Head Upgrade?
Sure! Give us a call on
(03)8595 4343
OR Simply click
Get In Touch
& 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 right now!
Buy NOW!
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
4.6 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
I loved
Super good, it really keeps the cold well
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Perfect Buy for you Hardworking Man/Women
I’ve bought my husband 3 of these already for work we love them easy to clean super durable perfect for his job. Keeps his coffee nice and hot and his chilled drinks nice and cool! We love it every chance we get we buy another one.
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Reviewed in the United States on January 11, 2026
★★★★★ 4
Doesn’t maintain hot too long.
I love this cup because the material is good for heavy duty jobs like mine. I took off one star because it does keep hot but not for super long, it lasts hot for about 2-3 hours. Other than that it’s easy to wash and the magnet that comes on the cup is super strong which comes in handy for not loosing it. It magnetized on to the cup.
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Reviewed in the United States on October 28, 2025
★★★★★ 5
It's the best.
I'm picky on my coffee cups. Klien though has made a great cup for ones like me who work construction. This tumbler not only keeps your coffee hot, but is tough as hell. I can't count how many times it's fallen, dropped, or accidently kicked and still works like new. The rubber bottom and sides grip great. The magnet is strong and helps with tipping over, or possibly dropping. The locking lid also helps with spills.
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Reviewed in the United States on August 4, 2024
★★★★★ 5
Best tumbler I've ever owned
I use this tumbler as a travel cup for my coffee primarily. I have also drank cold beverages out of it. Both are satisfying experiences. Why does this product appeal to me so much that I would buy one, recieve it and then buy another? Because they got it RIGHT.
They didn't waste time trying to put a handle on it that would be too big for some hands and too small for others. Instead, they put a grip surface on it that is comfortable and secure with or without gloves. A cup for all seasons and working men and women of America.
The lid screws on, and the drink spout cover snaps in place open and closed. Even better, it doesn't rub on your nose when you drink out of it. Stainless steel inside and out, except for the thick lid and grip surface. Keeps coffee hot way longer than I'm used to, but don't know for sure how long because I don't waste much time drinking it. I have one for my truck and one for my Jeep so I'll never be without it. Yeah. Love it that much. I don't use the provided rare earth magnets for the cup, but I put them to good use elsewhere. I can see where they would come in handy in the construction or other trades. I use the cups on my commute, around the house, and while enjoying the outdoors.
Keep up the good work, people!
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Reviewed in the United States on July 26, 2022