LS7 F.S.R. Dish
FSR (Forged Side Relief) slipper forging design accommodates factory stroke and rod length while easily clearing the reluctor wheel. These Heavy-Duty LS7 pistons are designed for extreme levels of Nitrous/Boost (Pin upgrade recommended above 700 HP). CNC-machined ring grooves accept 1.5, 1.5, 3mm rings. (CR calculated with .042 gasket thickness and 0.00" deck clearence). STOCK ROD MUST BE HONED TO ACCEPT .927" DIA PIN. MILLING OF ROD BALANCE PAD MAY BE NEEDED DUE TO VARIATION FROM FACTORY.
Includes:
Pin #927-2250-15-51C (111g)
Wire locks #927-073-MW
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LS7 Series
Std Bore: 4.125
Ring package designed for: 1.5, 1.5, 3MM Rings
NOTE: Please check piston to rod clearance due to variation in factory rod top thickness. Milling of rod balance pad may be needed.
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 64cc |
66cc |
72cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 279779 |
427 |
4.125 |
4.000 |
6.077 |
9.240 |
1.163 |
10.1 |
10.0 |
9.5 |
-22.0 |
434 |
B,C |
STD |
J60008-4125-5 |
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| 279780 |
428 |
4.130 |
4.000 |
6.077 |
9.240 |
1.163 |
10.1 |
10.0 |
9.5 |
-22.0 |
436 |
B,C |
0.005 |
J60008-4130-0 |
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Tech and Installation Tips
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Valve Relief Diagram
- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.