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.
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
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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 |
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| 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.