FORGED PISTONS
LS Series
Rod Length
Comp Ht.
Wrist Pin Type
Comp Ratio
Cubic Inch
Piston Ring Package
Part No.
Description
Stroke
4.070" Bore - Flat-Top MAH930223070 †
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
3.622"
6.098"
1.340"
P/F
10.1 @ 70cc
377
1.5mm, 1.5mm, 3.0mm
6.098" 6.125"
WISK398X7 †
3.622"
1.304"
P/F
10.7 @ 65cc 370/377 1.2mm, 1.2mm, 3.0mm
WISK454X7 †
4.000"
6.125"
1.050"
P/F
10.7 @ 65cc
416 1.2mm, 1.2mm, 3.0mmv
4.075" Bore - Flat-Top MAH930223075 † 4.130" Bore - Flat-Top MAH930221530 †
2 Reliefs, -4cc, LS3/L92
3.622"
6.098"
1.340"
P/F
10.2 @ 70cc
378
1.5mm, 1.5mm, 3.0mm
2 Reliefs, -3cc, LS7
4.000"
6.067"
1.181"
P/F
12.3 @ 64cc
429
.043", 1.5mm, 3.0mm
† Piston sets include piston rings. P/F - PRESS-FIT / FLOATING
PISTON PIN LOCKS
Piston Pin (Spiral) Locks and Lock Rings Piston Pin Lock Rings Part No. Qty. .927" x .042" JEP927-042-CS 1 SEALR194-16 16 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 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.
Bore Size
Rod Length Bal. Needed
Piston Type
Comp. Ratio/64cc
Part No.
Cubic Inch
Stroke
Piston Rings
Eagle
EAG129104030 EAG129123905 EAGB129123905 B
408 383 383
4.030" 3.905" 3.905"
4.000" 4.000" 4.000"
6.125" 6.125" 6.125"
Int. Int. Int.
4032 Mahle/Inv. Dome, -12cc
File-Fit
10.8:1 11.0:1 11.0:1
4032 Mahle/Flat Top, 2 Reliefs, -6cc File-Fit 4032 Mahle/Flat Top, 2 Reliefs, -6cc File-Fit
Notes: All kits: The Flexplate/Flywheel and balancer is not included. A 58-tooth reluctor. B Balanced assembly.
158 2021-22 ENGINE BUILDER CATALOG
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