LS1, LS6, Z06, 5.7L, 6.0L F.S.R. (Flat Top)
Our New FSR (Forged Side Relief) slipper forging design allows the use of the most popular stroke and rod combinations while eliminating reluctor wheel clearence problems (see photo). Lightweight and extremely durable, these pistons are machined for 1.5, 1.5, 3mm rings and have an inverted dome designed to achieve optimum compression ratio with forced induction applications (CR calculated with .042 gasket thickness and 0.00" deck clearence).
Includes:
Pin #927-2250-15-51C (111g)
Wire locks #927-073-MW
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350 Series
Std Bore: 3.900"-5.7L, 4.000"-6.0L
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 |
 |
| 243016 |
403 |
4.005 |
4.000 |
6.125 |
9.240 |
1.115 |
11.6 |
11.3 |
10.6 |
-5.0 |
402 |
B, C,M |
0.005 |
J60008-4000-5 |
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| 243017 |
408 |
4.030 |
4.000 |
6.125 |
9.240 |
1.115 |
11.7 |
11.4 |
10.7 |
-5.0 |
410 |
B, C |
0.030 |
J60008-4030-5 |
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| 243018 |
427 |
4.125 |
4.000 |
6.125 |
9.240 |
1.115 |
12.1 |
11.9 |
11.1 |
-5.0 |
440 |
B, C |
STD LS7 |
J60008-4125-5 |
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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.