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GM LS Asymmetrical FSR Dish / Inverted Dome

GM LS Inverted Dome
Our brand new Asymmetrical FSR (Forged Side Relief) forging design allows for the use of the most popular stroke and rod combinations while eliminating reluctor wheel clearance problems. Asymmetrical forging design maintains a larger skirt on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side. The result is a high strength, lightweight piston that significantly reduces friction in your engine. Lightweight and extremely durable, these pistons are machined for 1.2mm, 1.5mm, 3.0mm rings.

Combination 12° (LS7 Only) & 15° Valve Pockets

Features:
Accumulator Grooves
Double Pin Oilers
Offset Wrist Pin
Includes:
Pin #945-2250-15-51C (105g) For use with 6.098” Rod Length
Pin #927-2250-15-51C (106g) For use with 6.125” Rod Length
Round Wire Locks # 927-073-MW
GM LS Asymmetrical FSR Dish / Inverted Dome
GM LS Asymmetrical FSR Dome
STD Bore: 4.000" LS2 / 4.065" LS3 / 4.125 LSX
Ring Packaged Designed for 1.2mm, 1.5mm, and 3.0mm Rings
Note: 1.340 Compression Height Pistons utilize .945" Pin Diameter and 6.098" Rod Length.
*** LSA & LS9 Engines require oil squirter location modification for clearance. / OEM LSA Connecting Rods require milling for proper fitment ***

Click here to see matching JE Pro Seal Head Gaskets!

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
64cc 68cc 70cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
312052 413 4.000 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -28.7 Call B, M, T STD LSX JG3108-4000-7
324073 413 4.000 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -9.6 407 B, M STD LS2 JG3108-4000-7
312053 413 4.005 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -29.0 Call B, M, T .005 LS2 JG3108-4000-7
324074 413 4.005 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -9.8 408 B, M .005 LS2 JG3108-4000-7
312054 414 4.010 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -29.2 Call B, M, T .010 LS2 JG3108-4010-4
324075 414 4.010 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -10 409 B, M .010 LS2 JG3108-4010-4
312055 418 4.030 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -30.2 Call B, M, T .030 LS2 JG31F8-4030-2
324076 418 4.030 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -10.8 410 B, M .030 LS2 JG31F8-4030-2
312056 426 4.065 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -31.9 Call B, M, T STD LS3 JG31F8-4070-0
324077 426 4.065 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -12.1 409 B, M STD LS3 JG31F8-4070-0
312057 427 4.070 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -32.1 Call B, M, T .005 LS3 JG31F8-4070-0
324078 427 4.070 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -12.4 410 B, M .005 LS3 JG31F8-4070-0
312058 428 4.075 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -32.4 Call B, M, T .010 LS3 JG31F8-4075-5
324079 428 4.075 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -12.6 411 B, M .010 LS3 JG3108-4075-5
312059 429 4.080 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -32.6 Call B, M, T .015 LS3 JG31F8-4075-5
324080 429 4.080 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -12.8 412 B, M .015 LS3 JG3108-4075-5
312060 438 4.125 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -34.9 Call B, M, T STD LSX JG31F8-4125-2
324081 438 4.125 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -14.6 417 B, M STD LSX JG31F8-4125-2
312061 439 4.130 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -35.1 Call B, M, T .005 LSX JG31F8-4135-2
324082 439 4.130 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -14.8 418 B, M .005 LSX JG31F8-4135-2
312062 440 4.135 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -35.4 Call B, M, T .010 LSX JG31F8-4135-2
324083 440 4.135 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -15 419 B, M .010 LSX JG31F8-4135-2
312063 445 4.155 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -36.4 Call B, M, T .030 LSX JG31F8-4155-3
324084 445 4.155 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -15.8 430 B, M .030 LSX JG31F8-4155-3
312064 451 4.185 4.100 6.125 9.240 1.065 9.3 9.0 8.8 -37.9 Call B, M, T .060 LSX JG3108-4185-3
324085 451 4.185 4.100 6.125 9.240 1.065 10.9 10.5 10.3 -17.0 440 B, M .060 LSX JG3108-4185-3
312039 402 4.000 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -26.1 Call B, T STD LS2 JG3108-4000-7
324060 402 4.000 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -7.4 NEW STD LS2 JG3108-4000-7
312040 403 4.005 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -26.4 Call B, T .005 LS2 JG3108-4000-7
324061 403 4.005 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -7.6 NEW .005 LS2 JG3108-4000-7
312041 404 4.010 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -26.6 Call B, M, T .010 LS2 JG3108-4010-4
324062 404 4.010 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -7.8 NEW M .010 LS2 JG3108-4010-4
312042 408 4.030 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -27.6 Call B, M, T .030 LS2 JG31F8-4030-2
324063 408 4.030 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -8.6 NEW M .030 LS2 JG31F8-4030-2
312043 415 4.065 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -29.2 Call B, T STD LS3 JG31F8-4070-0
324064 415 4.065 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -9.9 NEW STD LS3 JG31F8-4070-0
312044 416 4.070 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -29.5 Call B, T .005 LS3 JG31F8-4070-0
324065 416 4.070 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -10.1 NEW .005 LS3 JG31F8-4070-0
312045 417 4.075 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -29.7 Call B, M, T .010 LS3 JG31F8-4075-5
324066 417 4.075 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -10.3 NEW M .010 LS3 JG3108-4075-5
312046 418 4.080 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -30 Call B, M, T .015 LS3 JG3108-4075-5
324067 418 4.080 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -10.5 NEW M .015 LS3 JG3108-4075-5
312047 427 4.125 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -32.1 Call B, T STD LSX JG31F8-4125-2
324068 427 4.125 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -12.2 NEW M STD LSX JG31F8-4125-2
312048 429 4.130 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -32.4 Call B, T .005 LSX JG31F8-4135-2
324069 429 4.130 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -12.4 NEW M .005 LSX JG31F8-4135-2
312049 430 4.135 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -32.6 Call B, M, T .010 LSX JG31F8-4135-2
324070 430 4.135 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -12.6 NEW M .010 LSX JG31F8-4135-2
312050 434 4.155 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -33.6 Call B, M, T .030 LSX JG31F8-4155-3
324071 434 4.155 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -13.4 NEW M .030 LSX JG31F8-4155-3
312051 440 4.185 4.000 6.125 9.240 1.115 9.3 9.0 8.8 -35 Call B, M, T .060 LSX JG3108-4185-3
324072 440 4.185 4.000 6.125 9.240 1.115 10.9 10.5 10.3 -14.6 NEW M .060 LSX JG3108-4185-3
324029 392 4.000 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -21.1 398 STD LS2 JG3108-4000-7
324030 393 4.005 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -21.3 400 .005 LS2 JG3108-4000-7
324031 394 4.010 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -21.6 401 M .010 LS2 JG3108-4010-4
324032 398 4.030 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -22.5 405 M .030 LS2 JG31F8-4030-2
324033 405 4.065 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -24 406 STD LS3 JG31F8-4070-0
324041 406 4.070 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -24.3 407 .005 LS3 JG31F8-4070-0
324034 407 4.075 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -24.5 408 M .010 LS3 JG3108-4075-5
324035 408 4.080 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -24.7 409 M .015 LS3 JG3108-4075-5
324036 417 4.125 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -26.8 427 M STD LSX JG31F8-4125-2
324037 418 4.130 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -27 428 M .005 LSX JG31F8-4135-2
324038 419 4.135 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -27.3 429 M .010 LSX JG31F8-4135-2
324039 423 4.155 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -28.2 435 M .030 LSX JG31F8-4155-3
324040 429 4.185 3.900 6.125 9.240 1.165 9.3 9.0 8.8 -29.6 445 M .060 LSX JG3108-4185-3
312024 364 4.000 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -16.4 Call T STD LS2 JG3108-4000-7
312018 364 4.000 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -16.4 Call K, T STD LS2 JG3108-4000-7
312019 365 4.005 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -16.6 Call K, T .005 LS2 JG3108-4000-7
312025 365 4.005 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -16.6 Call T .005 LS2 JG3108-4000-7
312026 366 4.010 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -16.8 Call M, T .010 LS2 JG3108-4010-4
312020 366 4.010 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -16.8 Call K, M, T .010 LS2 JG3108-4010-4
312021 370 4.030 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -17.7 Call K, M, T .030 LS2 JG31F8-4030-2
312029 370 4.030 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -17.7 Call M, T .030 LS2 JG31F8-4030-2
312030 376 4.065 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -19.2 Call T STD LS3 JG31F8-4070-0
312022 376 4.065 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -19.2 Call K, T STD LS3 JG31F8-4070-0
312023 377 4.070 3.622 6.098 9.240 1.340 9.3 9.0 8.8 -19.4 Call K, M, T .005 LS3 JG31F8-4070-0
312031 377 4.070 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -19.4 Call T .005 LS3 JG31F8-4070-0
312032 378 4.075 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -19.6 Call M, T .010 LS3 JG31F8-4075-5
312033 378 4.080 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -19.8 Call M, T .015 LS3 JG31F8-4075-5
312034 387 4.125 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -21.8 Call T STD LSX JG31F8-4125-2
312035 388 4.130 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -22 Call T .005 LSX JG31F8-4135-2
312036 389 4.135 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -22.2 Call M, T .010 LSX JG31F8-4135-2
312037 393 4.155 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -23.1 Call M, T .030 LSX JG31F8-4155-3
312038 399 4.185 3.622 6.125 9.240 1.304 9.3 9.0 8.8 -24.4 Call M, T .060 LSX JG3108-4185-3

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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