Speed-Pro Competition Series Main Bearings

4.14 out of 5 stars 63 Customer Reviews

If you're building a serious performance engine, then you'll want to consider Speed-Pro Competition Series main bearings. They were developed in NASCAR and Pro Stoc

If you're building a serious performance engine, then you'll want to consider Speed-Pro Competition Series main bearings. They were developed in NASCAR and Pro Stock competition, so you know they're tough. The bearings are built on premium 1020AK steel backings and overlaid with Speed-Pro's super-duty H-14 alloy. That layer is then covered with a nickel barrier, followed by a thin lead-tin-copper overplate. However, unlike other performance bearings, there is no flash tin layer on top of that. Speed-Pro's engineers have determined that such a layer can actually move around under high loads—sometimes with undesirable consequences. Depending on the application, these main bearings have oil grooves for enhanced lubrication, while maintaining a maximum bearing surface area. They also feature Speed-Pro's exclusive contoured-flange thrust bearing technology for higher thrust-loading capacity. Competition Series main bearings are available in nearly a hundred configurations for countless vehicle and engine applications.

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Results 1 - 14 of 14

Speed-Pro Competition Series Main Bearings 141M

Main Bearings, Competition Series, Standard Size, Tri Metal, 3/4 Groove, Chevy, 7.4L, Set of 5

Part Number: SLP-141M

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 140M

Main Bearings, Competition Series, Standard Size, Tri Metal, 3/4 Groove, Chevy, 400, Set of 5

Part Number: SLP-140M

4.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 139M

Main Bearings, Competition Series, Standard Size, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5

Part Number: SLP-139M

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 141M1X

Main Bearings, Competition Series, 0.001 Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 7.4L, Set of 5

Part Number: SLP-141M1X

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 139M1

Main Bearings, Competition, 0.001 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5

Part Number: SLP-139M1

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 152M

Main Bearings, Competition Series, Standard Size, Super Duty Alloy, 3/4 Groove, Chevy, LS, Set of 5

Part Number: SLP-152M

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 152M10

Main Bearings, Competition, 0.010 in. Crankshaft Undersize, Super Duty Alloy, 3/4 Groove, Chevy, Pontiac, 5.7L, Set of 5

Part Number: SLP-152M10

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 139M20

Main Bearings, Competition, 0.020 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5

Part Number: SLP-139M20

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 152M1X

Main Bearings, Competition, 0.001 in. Oversize, .001 extra clearance Super Duty Alloy, 3/4 Groove, Chevy, Pontiac, 5.7L, Set of 5

Part Number: SLP-152M1X

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 139M11

Main Bearings, Competition, 0.011 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5

Part Number: SLP-139M11

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 152M1

Main Bearings, Competition, 0.001 in. Crankshaft Undersize, Super Duty Alloy, 3/4 Groove, Chevy, Pontiac, 5.7L, Set of 5

Part Number: SLP-152M1

Not Yet Reviewed

Estimated Ship Date: Mar 12, 2026 if ordered today

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Estimated Ship Date: Mar 12, 2026 if ordered today

Speed-Pro Competition Series Main Bearings 140M10

Main Bearings, Competition Series, 0.010 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 400, Set of 5

Part Number: SLP-140M10

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 141M10

Main Bearings, Competition Series, 0.010 Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 7.4L, Set of 5

Part Number: SLP-141M10

Not Yet Reviewed

Estimated Ship Date: Monday 2/23/2026 if shipped by air

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Estimated Ship Date: Monday 2/23/2026 if shipped by air

Speed-Pro Competition Series Main Bearings 140M1X

Main Bearings, Competition Series, 0.001 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 400, Set of 5

Part Number: SLP-140M1X

Not Yet Reviewed

Estimated Ship Date: Mar 10, 2026 if ordered today

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Estimated Ship Date: Mar 10, 2026 if ordered today

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