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LS7 Asymmetrical FSR Dome

GM LS7 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. (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 Dome
Std Bore 4.125
Ring Packaged Designed for 1.2mm, 1.5mm, and 3.0mm Rings
STOCK ROD MUST BE HONED TO ACCEPT .927" DIA PIN. MILLING OF ROD BALANCE PAD MAY BE NEEDED DUE TO VARIATION FROM FACTORY.

*** 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
311928 438 4.125 4.100 6.125 9.240 1.065 12.5 1.3 Call B, M STD JG31F8-4125-2
311929 438 4.1275 4.100 6.125 9.240 1.065 12.5 1.2 Call B, M .0025 JG31F8-4125-2
311930 439 4.130 4.100 6.125 9.240 1.065 12.5 1.1 Call B, M .005 JG31F8-4135-2
311922 427 4.125 4.000 6.077 9.240 1.163 12.5 3.2 Call M STD JG31F8-4125-2
311925 427 4.125 4.000 6.125 9.240 1.115 12.5 3.2 Call B, M STD JG31F8-4125-2
311926 428 4.1275 4.000 6.125 9.240 1.115 12.5 3.1 Call B, M .0025 JG31F8-4125-2
311923 428 4.1275 4.000 6.077 9.240 1.163 12.5 3.1 Call M .0025 JG31F8-4125-2
311924 429 4.130 4.000 6.077 9.240 1.163 12.5 3.0 Call M .005 JG31F8-4135-2
311927 429 4.130 4.000 6.125 9.240 1.115 12.5 3.0 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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