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BMW E34 525i M20 2.5L

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BMW E34 525i M20 2.5L Performance Engine Internals

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M20 Cylinder Head - complete

ES#2918686 - 11121707032-2 - M20 Cylinder Head - complete - Complete cylinder head with guides, seats, valves, & springs - AMC - BMW
ECS Tuning recommends this product.

Complete cylinder head with guides, seats, valves, & springs affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
AMC - Corporate Logo
ES#:
2918686
Mfg#:
11121707032-2
Ships on Jul 7, 2026
$1322.99 USD
Free Shipping

Performance Main Bearing Set

ES#4364525 - MB7039XP - Performance Main Bearing Set - Performance engine bearing kit - King - BMW

Performance engine bearing kit affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
King - Corporate Logo
ES#:
4364525
Mfg#:
MB7039XP
In Stock
$309.99

This product was last offered at the strikethrough price on
05-11-2026

$203.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

WPC Treated Crank Bearing Set

ES#4000006 - 11211706847wpcKT - WPC Treated Crank Bearing Set - Stronger & smoother, with less friction for your BMW! - ECS - BMW
ECS Tuning recommends this product.

Stronger & smoother, with less friction for your BMW! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4000006
Mfg#:
11211706847WPCKT
In Stock
ON SALE!
$245.99

This product was last offered at the strikethrough price on
05-02-2026

$238.61 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

WPC-Treated Race Series Rod Bearing Set - M20/M50/M52/M54/S50/S52

ES#4845637 - M5X-WPC-RB - WPC-Treated Race Series Rod Bearing Set - M20/M50/M52/M54/S50/S52 - The strongest and smoothest bearings for your BMW, featuring heavy-duty ACL "Duraglide" bearing shells treated by WPC for reduced friction and enhanced durability. - Turner Motorsport - BMW

The strongest and smoothest bearings for your BMW, featuring heavy-duty ACL "Duraglide" bearing shells treated by WPC for reduced friction and enhanced durability. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Turner Motorsport - Corporate Logo
ES#:
4845637
Mfg#:
M5X-WPC-RB
In Stock
ON SALE! SAVE 25%
$465.99

This product was last offered at the strikethrough price on
05-02-2026

$349.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Complete Cylinder Head Basic Replacement Kit

ES#2918762 - 11121707032-2KT - Complete Cylinder Head Basic Replacement Kit - Everything you will need to do a head service on your BMW - Assembled By ECS - BMW

Everything you will need to do a head service on your BMW affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2918762
Mfg#:
11121707032-2KT
Ships on Jul 7, 2026
ON SALE!
$1642.99

This product was last offered at the strikethrough price on
01-03-2026

$1596.66 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

King Performance BMW S54 Main Bearings - Std.

ES#4756551 - MB7039AM - King Performance BMW S54 Main Bearings - Std. - Standard Size - King - BMW

Standard Size affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
King - Corporate Logo
ES#:
4756551
Mfg#:
MB7039AM
In Stock at Vendor
$169.99

This product was last offered at the strikethrough price on
06-05-2026

$109.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Complete Cylinder Head Ultimate Replacement Kit

ES#2918763 - 11121707032kt1KT - Complete Cylinder Head Ultimate Replacement Kit - Everything you will need to do a head service on your BMW, plus a new thermostat, thermostat housing, a magnetic drain plug, a camshaft position sensor, spark plugs, ignition wires, and distributor - Assembled By ECS - BMW

Everything you will need to do a head service on your BMW, plus a new thermostat, thermostat housing, a magnetic drain plug, a camshaft position sensor, spark plugs, ignition wires, and distributor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2918763
Mfg#:
11121707032KT1KT
Ships on Jul 7, 2026
ON SALE!
$2111.99

This product was last offered at the strikethrough price on
01-03-2026

$2111.36 USD
This product is lifetime replacement eligible Partial Replacement

WPC-Treated Race Series Main Bearing Set - M20/M50/M52/M54/S54

ES#4845662 - M5X-WPC-MB - WPC-Treated Race Series Main Bearing Set - M20/M50/M52/M54/S54 - The strongest and smoothest bearings for your BMW, featuring heavy-duty ACL "Duraglide" bearing shells treated by WPC for reduced friction and enhanced durability. - Turner Motorsport - BMW

The strongest and smoothest bearings for your BMW, featuring heavy-duty ACL "Duraglide" bearing shells treated by WPC for reduced friction and enhanced durability. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Turner Motorsport - Corporate Logo
ES#:
4845662
Mfg#:
M5X-WPC-MB
In Stock
ON SALE! SAVE 10%
$509.99

This product was last offered at the strikethrough price on
05-02-2026

$458.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Performance Rod Bearing Set - Standard Set

ES#4364526 - CR6640XP - Performance Rod Bearing Set - Standard Set - Upgrade your Rod Bearings to a performance oriented option! - King - BMW

Upgrade your Rod Bearings to a performance oriented option! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
King - Corporate Logo
ES#:
4364526
Mfg#:
CR6640XP
In Stock at Vendor
$163.99

This product was last offered at the strikethrough price on
05-21-2026

$148.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Cylinder Head - Bare

ES#2918684 - 11121707032 - Cylinder Head - Bare - Bare head, guides and seats only - AMC - BMW

Bare head, guides and seats only affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
AMC - Corporate Logo
ES#:
2918684
Mfg#:
11121707032
Ships on Jun 30, 2026
$999.00 USD

King Performance BMW S54 Main Bearings - .25 Oversize

ES#4756556 - MB7039AM0.25 - King Performance BMW S54 Main Bearings - .25 Oversize - .25+ Oversize - King - BMW

.25+ Oversize affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
King - Corporate Logo
ES#:
4756556
Mfg#:
MB7039AM0.25
Ships in 7 Business Days
$178.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

"Yellow" Crankshaft Bearing Shell - Set

ES#2626368 - 11211706850 - "Yellow" Crankshaft Bearing Shell - Set - 59.75MM(+0.25) bore - Glyco - BMW

59.75MM(+0.25) bore affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Glyco - Corporate Logo
ES#:
2626368
Mfg#:
11211706850
In Stock at Vendor
$126.61 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

CP-Carrillo Connecting Rod Set M20 Pro-Xtreme

ES#4759093 - CAR-CRS-M20-XT - CP-Carrillo Connecting Rod Set M20 Pro-Xtreme - Upgrade To CP-Carrillo Connecting Rods! - 5150 Autosport - BMW

Upgrade To CP-Carrillo Connecting Rods! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For Vehicles With 135mm Connecting Rods

Brand:
5150 Autosport - Corporate Logo
ES#:
4759093
Mfg#:
CAR-CRS-M20-XT
Ships in 4 Business Days
$2099.99 USD
Free Shipping
on orders $49 and up

CP Forged Piston Set BMW M20 B25 Std.

ES#4759088 - CP-FPS-M20-B25 - CP Forged Piston Set BMW M20 B25 Std. - 9.5:1 Compression Ratio, Standard 84mm Bore - 5150 Autosport - BMW

9.5:1 Compression Ratio, Standard 84mm Bore affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
5150 Autosport - Corporate Logo
ES#:
4759088
Mfg#:
CP-FPS-M20-B25
Back Ordered
$1349.99 USD
Free Shipping
on orders $49 and up

More About Performance Engine Internals

Building your dream engine? We have all the bearings, pistons, connecting rods, timing components, and more to help make that dream a reality.

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