Page 160 - 2021-22_EngineCatalogAP

FORGED PISTONS
LS Series
Part No. Description
4.070" Bore - Flat-Top
Rod Stroke Length
3.622" 6.098"
6.098" 3.622" 6.125"
4.000" 6.125"
3.622" 6.098" 4.000" 6.067"
Comp Wrist Pin Ht. Type
1.340" P/F 1.304" P/F
1.050" P/F
1.340" P/F 1.181" P/F
Comp Ratio
10.1 @ 70cc 10.7 @ 65cc
10.7 @ 65cc
10.2 @ 70cc 12.3 @ 64cc
Cubic Piston Ring Inch Package
377 1.5mm, 1.5mm, 3.0mm 370/377 1.2mm, 1.2mm, 3.0mm
416 1.2mm, 1.2mm, 3.0mmv
378 1.5mm, 1.5mm, 3.0mm 429 .043", 1.5mm, 3.0mm
MAH930223070 † WISK398X7 †
WISK454X7 †
2 Reliefs, -4cc, LS3/L92
NA/Boost/Nitrous, 2 Reliefs, -3.2cc, LS1/LS2/LS6/L92, .927" Pin Dia.
Professional Series, Dished, 2 Reliefs, -14cc
4.075" Bore - Flat-Top
MAH930223075 † 2 Reliefs, -4cc, LS3/L92
4.130" Bore - Flat-Top
MAH930221530 † 2 Reliefs, -3cc, LS7
† Piston sets include piston rings. P/F - PRESS-FIT / FLOATING
PISTON PIN LOCKS
LS / LT (GEN-5) SERIES
Piston Pin (Spiral) Locks and Lock Rings
Piston Pin (Spiral) Locks
Part No. Qty.
.927" x .042"
SEALR260-16 16
.927" x .062"
MAH6441489 1
.927" x .075"
WISCS-24 2
Piston Pin Lock Rings
Part No. Qty.
.927" x .042"
JEP927-042-CS 1 SEALR194-16 16
PISTON RINGS SECTION - See Pages 523-537 ROTATING ASSEMBLIES
LS Series
Compression ratios are based on a 66cc combustion chamber. LS2/LQ4/LQ9 LS powerplants with 24-tooth reluctor. Designed for internal balance with no heavy metal needed. Requires balancing.
Part No.
Eagle
EAG129104030
EAG129123905 EAGB129123905 B
Cubic Inch
408 383 383
Bore Size
4.030" 3.905" 3.905"
Stroke
4.000" 4.000" 4.000"
Rod Length
6.125" 6.125" 6.125"
Bal. Needed
Int. Int. Int.
Piston Type
4032 Mahle/Inv. Dome, -12cc 4032 Mahle/Flat Top, 2 Reliefs, -6cc 4032 Mahle/Flat Top, 2 Reliefs, -6cc
Piston Rings
File-Fit File-Fit File-Fit
Comp. Ratio/64cc
10.8:1 11.0:1 11.0:1
Notes: All kits: The Flexplate/Flywheel and balancer is not included. A 58-tooth reluctor. B Balanced assembly.
158 2021-22 ENGINE BUILDER CATALOG