- Engines & Components
- Rotating Assembly Kits
- Eagle Big Block Mopar Competition Rotating Assemblies
Eagle Big Block Mopar Competition Rotating Assemblies offer the ultimate reliability and strength at an affordable price for the most demanding applications. These kits include an Eagle Forged 4340 Steel Crankshaft, Eagle H-Beam Rods, Mahle Forged Pistons, Hastings Rings and high-performance Clevite or King Bearings.
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Notes:
- Assembly part numbers that begin with “B” are balanced by Eagle and require no additional balancing. Part numbers that do not begin with “B” are unbalanced assemblies and must be balanced by a qualified machine shop before use.
- All kits are designed for internal balance.
- Mopar 400 "B" engines have a standard bore size of 4.340". Kits are available in .030" oversize only (4.375").
- Mopar 440 "RB" engines have a standard bore size of 4.320". Kits are available in .030", and .055" oversizes.
- Eagle Specialty Products reserves the right to substitute pistons due to availability.
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AVAILABILITY
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PART TYPE
PART TYPE
BRAND
BRAND
Part Fitment
Part Category
Vendor Part Number
Piston Material
Rod Bearing Undersize mm
Oil Pump Included
Actual Engine CID
Connecting Rod Material
Main Bearings Included
Piston Rings Included
Piston Head Volume cc
Rod Bearings Included
Piston Ring Facing Material
Assembly Lubricant Included
Timing Chain and Gears Included
RATING
PRICE
440 Block 6 Bolt Flange Competition Assemblies
Competition Rotating Assembly -
Mopar 440
Stroke: 3.750
Disp. @ 4.350: 446
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 10.5/9.8/9.5
Mopar 440
Stroke: 3.750
Disp. @ 4.350: 446
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 10.5/9.8/9.5
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$2,711.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 3.750
Disp. @ 4.375: 451
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 10.5/9.8/9.5
Mopar 440
Stroke: 3.750
Disp. @ 4.375: 451
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 10.5/9.8/9.5
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$2,701.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 4.150
Disp. @ 4.350: 493
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 11.6/10.7/10.4
Mopar 440
Stroke: 4.150
Disp. @ 4.350: 493
Rod Length: 6.760
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 11.6/10.7/10.4
View Details
$2,607.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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440 Block 8 Bolt Flange Competition Assemblies
Competition Rotating Assembly -
Mopar 440
Stroke: 4.250
Disp. @ 4.350: 505
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.3/11.4/11.0
Mopar 440
Stroke: 4.250
Disp. @ 4.350: 505
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.3/11.4/11.0
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$2,503.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 4.250
Disp. @ 4.375: 511
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.3/11.4/11.0
Mopar 440
Stroke: 4.250
Disp. @ 4.375: 511
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.3/11.4/11.0
View Details
$2,929.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 4.375
Disp. @ 4.350: 520
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.6/11.7/11.3
Mopar 440
Stroke: 4.375
Disp. @ 4.350: 520
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.6/11.7/11.3
View Details
$2,754.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 4.500
Disp. @ 4.350: 535
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.8/11.9/11.4
Mopar 440
Stroke: 4.500
Disp. @ 4.350: 535
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.8/11.9/11.4
View Details
$3,011.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Competition Rotating Assembly -
Mopar 440
Stroke: 4.500
Disp. @ 4.375: 541
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.8/11.9/11.4
Mopar 440
Stroke: 4.500
Disp. @ 4.375: 541
Rod Length: 7.100
Pistons: -8cc Flat Top
Rings: File Fit
Comp. Ratio 72cc/80cc/84cc: 12.8/11.9/11.4
View Details
$3,021.99
Estimated to ship direct from manufacturer on 07/29/26, pending manufacturer availability.
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Lowest Price Guarantee