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LS7 Asymmetrical FSR Dish

GM LS7 Dish 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. (CR calculated with .040 gasket thickness and 0.00" deck clearance). STOCK ROD MUST BE HONED TO ACCEPT .927" DIA PIN. MILLING OF ROD BALANCE PAD MAY BE NEEDED DUE TO VARIATION FROM FACTORY.

Features:
Accumulator Grooves
Double Pin Oilers
Offset Wrist Pin
Includes:
Pin #927-2250-15-51C (106g)
Round Wire Locks # 927-073-MW
New for 2013!
LS7 Asymmetrical FSR Dish
Std Bore 4.125
Ring Packaged Designed for 1.2mm, 1.5mm, and 3.0mm Rings

*** LSA & LS9 Engines require oil squirter location modification for clearance. ***

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
70
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
311919 438 4.125 4.100 6.125 9.240 1.065 9.0 -33.0 Call B, M STD JG31F8-4125-2
311920 438 4.1275 4.100 6.125 9.240 1.065 9.0 -33.0 Call B, M .0025 JG31F8-4125-2
311921 439 4.130 4.100 6.125 9.240 1.065 9.0 -33.0 Call B, M .005 JG31F8-4135-2
311916 427 4.125 4.000 6.125 9.240 1.115 9.0 -30.0 Call B STD JG31F8-4125-2
311917 428 4.1275 4.000 6.125 9.240 1.115 9.0 -30.0 Call B, M .0025 JG31F8-4125-2
311918 429 4.130 4.000 6.125 9.240 1.115 9.0 -30.0 Call B, M .005 JG31F8-4135-2

- 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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