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Gen V LT1 Asymmetrical FSR

GM LT1 Asymmetrical FSR
Our 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.


Features:
Accumulator Grooves
Double Pin Oilers
Offset Wrist Pin
Includes:
Pin #927-2250-15-51C (106g) For use with 6.125” Rod Length
Round Wire Locks # 927-073-MW
Gen V LT1 Asymmetrical FSR
GM LT1 Asymmetrical FSR
STD Bore: 4.065" LT1
Ring Packaged Designed for 1.2mm, 1.5mm, and 3.0mm Rings

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
59cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
338682 376 4.065 4.000 6.125 9.240 1.115 10.0 -23.9cc Call F STD JG31F8-4070-0
338685 376 4.065 4.000 6.125 9.240 1.115 12.3 -4.6cc Call F STD JG31F8-4070-0
338686 377 4.070 4.000 6.125 9.240 1.115 12.3 -4.8cc Call F 0.005 JG31F8-4070-0
338683 377 4.070 4.000 6.125 9.240 1.115 10.0 -24.1cc Call F 0.005 JG31F8-4070-0
338684 378 4.075 4.000 6.125 9.240 1.115 10.0 -24.3cc Call F 0.010 JG3108-4075-5
338687 378 4.075 4.000 6.125 9.240 1.115 12.3 -5.0cc Call F 0.010 JG3108-4075-5
338676 376 4.065 3.622 6.125 9.240 1.304 10.0 -15.0cc Call F STD JG31F8-4070-0
338679 376 4.065 3.622 6.125 9.240 1.304 12.3 2.5cc Call F STD JG31F8-4070-0
338680 377 4.070 3.622 6.125 9.240 1.304 12.3 2.3cc Call F 0.005 JG31F8-4070-0
338677 377 4.070 3.622 6.125 9.240 1.304 10.0 -15.1cc Call F 0.005 JG31F8-4070-0
338678 378 4.075 3.622 6.125 9.240 1.304 10.0 -15.3cc Call F 0.010 JG3108-4075-5
338681 378 4.075 3.622 6.125 9.240 1.304 12.3 2.2cc Call F 0.010 JG3108-4075-5

- 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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