Share |
LS7 Asymmetrical FSR Flat Top

GM LS7 Flat Top 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 Flat Top
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
70cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
311909 438 4.125 4.100 6.125 9.240 1.065 12.0 -2.0 Call B, M STD JG31F8-4125-2
311910 438 4.1275 4.100 6.125 9.240 1.065 12.0 -2.0 Call B, M .0025 JG31F8-4125-2
311911 439 4.130 4.100 6.125 9.240 1.065 12.0 -2.0 Call B, M .005 JG31F8-4135-2
311902 427 4.125 4.000 6.077 9.240 1.163 11.7 -2.0 Call STD JG31F8-4125-2
311905 427 4.125 4.000 6.125 9.240 1.115 11.7 -2.0 Call B STD JG31F8-4125-2
311906 428 4.1275 4.000 6.125 9.240 1.115 11.7 -2.0 Call B, M .0025 JG31F8-4125-2
311903 428 4.1275 4.000 6.077 9.240 1.163 11.7 -2.0 Call M .0025 JG31F8-4125-2
311904 429 4.130 4.000 6.077 9.240 1.163 11.7 -2.0 Call M .005 JG31F8-4135-2
311907 429 4.130 4.000 6.125 9.240 1.115 11.7 -2.0 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.


JE Pistons 10800 Valley View Street Cypress, California 90630 - Sales/Technical Assistance | Careers @ JE
Copyright © 2017 JE Pistons Inc. All Rights Reserved - Use of this site is subject to the following list of Terms & Conditions.