SKU: 24207687939

King Engine Bearings Main Bearing Set for 1975-1978 GMC K25 (MB 509XP STDX)

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Description

King Engine Bearings Main Bearing Set for 1975-1978 GMC K25 (MB 509XP STDX)Todays sport compact race engines make more power than ever before. Yesterdays engine bearings load capacity no longer works for todays sport compact race engines. Tomorrows engines will be even more powerful. King bearings meet these demands with higher performance benchmarks, advanced materials and unique geometrical features. King Racings SV, GPC, XP, and XPC series of rod and main bearings were developed to meet these challenges through

Today’s sport compact race engines make more power than ever before. Yesterday’s engine bearings’ load capacity no longer works for today’s sport compact race engines. Tomorrow’s engines will be even more powerful.

King bearings meet these demands with higher performance benchmarks, advanced materials and unique geometrical features.
King Racing’s SV, GPC, XP, and XPC series of rod and main bearings were developed to meet these challenges through technologically advanced geometrical features and a unique metal structures. Together, they drive the industry to a higher level of durability, performance and expectation.

pMax Black is a unique tri-metal structure the has been developed to meet the ongoing demand for bearings with increased load capacity. As engines evolve and gain more power, engine bearings have to be able to handle the extra loading.

pMax Black consists of three layers that come together to form the strongest tri-metal bearing in the industry with load capacity exceeding the competition by as much as 24%. King Racing’s new hardening technology modifies the overlay molecular structure and creates a fatigue resisting shield.

The intermediate layer of a typical race bearing contains 2-3% tin, with hardness values of 90-95 HV. For a superior pMax Black intermediate layer, we increased the tin content to 4.5%, making it 22% harder (115 HV), with a load carrying capacity of 17,000 psi.

The overlay of a typical high performance bearing consists of a leaded alloy that contains 2-3% copper. It achieves a hardness level of 11 – 14 HV, and a maximum load capacity of 8,000-8,500 psi. King’s pMaxBlack overlay is significantly stronger than conventional overlays due to its 5% copper content and an innovative nano-scaled hardening process.

The pMaxBlack overlay contains 5% copper. It is further strengthened by a proprietary nano-scaled hardening process that modifies the molecular structure and creates a black fatigue-resistant shield. The outcome is a significant 29% increase in overlay hardness (18.1HV) and overall 24% increase in load capacity (10,200 psi).

SecureBond – Maximum tri-metal structural integrity

High loads and high RPM’s create critical stresses that travel through the multi-layer construction of a tri-metal race bearing. SecureBond is a micro-etch surface preparation process that strengthens the tri-metal structural integrity. SecureBond reduces the likelihood of catastrophic failure due to delamination of one layer from the other under extreme load conditions or metal–to-metal contact.

 



Check your bearing size using our fitment calculator here

 

 

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SKU: 24207687939

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Bill M
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The Future is Now
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The author makes a compelling argument that the world is fracturing into two principal trade blocs, the U.S.A bloc and the China bloc. Even cursory review of the daily business news confirms the author's argument is taking shape now. This is an important book for those interested in geopolitics, economics, and even those who are trying to determine where to invest their funds based on changing global dynamics.
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Oregon Gma
New York, US
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Cute book and engaging story
Format: Paperback
My grand daughter reads at a 3rd grade reading level, so doesn't want to read the easy readers but loses interest easily with traditional chapter books. This little book was a perfect fit. She's an axolotl fan so the pictures and the story line kept her engaged. There's even a couple of pages of axolotl facts at the end of the book. Well worth adding to her book shelf!
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Olive O
Houston, US
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Love this book!
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Couldn't put this down! The story is lovely, heartfelt, and bounces along. I was sad when it ended. Have to read it again, then!
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Erin sumner
Charlottesville, US
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Perfect for a 6 year old.
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Grandson turned 6 and he absolutely loved it. Best reaction to it ever.
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RosanneP
Los Angeles, US
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Quick, fun read
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I purchased this because my son and I have been raising 2 albino axolotls since 2022. The illustrations are very cute and well done. The story includes a few characters and even though it's so short, there is clear character development. I would recommend this for children under the age of 8 to be read to. With repetition, they will easily be able to read this book (apart from those with reading challenges). My 12 year old read it through in one sitting and added his own unique reading style to it which was really funny. I wouldn't recommend reading this on a small screen as the font is small.
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Reviewed in the United States on October 20, 2025

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