F.S.R. SUPERFLY GP (GAS PORTED)
The ultimate light-weight piston for Late Model Stock two-barrel and similar applications up to 400 horsepower. FSR forging provides reduced skirt contact that lowers friction for optimum HP gains. Pistons feature a .190" deep intake valve pocket for maximum compression. The ring grooves are machined for 1.2, 1.2, 3mm back cut rings with lateral gas ports provided for superior ring seal.
Includes:
Pin #927-2350-15-51C (111g)
Wire lock #927-073-MW
Lateral gas ports
Double Pin Oilers
Accumulator Groove
Contact Reduction Grooves
Rated up to 400 horsepower
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350 Series
Std Bore: 4.000
Ring package designed for: 1.2, 1.2, 3MM Rings
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 58cc |
64cc |
76cc |
| Compression Ratio |
|
Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 300245 |
357 |
4.030 |
3.500 |
6.250 |
9.000 |
1.000 |
11.6 |
10.8 |
9.4 |
-1.8 |
310 |
A,M |
.030 |
J70008-4030-5 |
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| 300247 |
357 |
4.030 |
3.500 |
6.125 |
9.000 |
1.125 |
11.6 |
10.8 |
9.4 |
-1.8 |
CALL |
A,M |
.030 |
J70008-4030-5 |
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| 300249 |
357 |
4.030 |
3.500 |
6.000 |
9.000 |
1.250 |
11.6 |
10.8 |
9.4 |
-1.8 |
334 |
A |
.030 |
J70008-4030-5 |
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| 300252 |
357 |
4.030 |
3.500 |
5.700 |
9.000 |
1.550 |
11.6 |
10.8 |
9.4 |
-1.8 |
CALL |
A |
.030 |
J70008-4030-5 |
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| 300253 |
358 |
4.035 |
3.500 |
5.700 |
9.000 |
1.550 |
11.6 |
10.8 |
9.4 |
-1.8 |
CALL |
A,M |
.035 |
J70008-4030-5 |
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| 300250 |
358 |
4.035 |
3.500 |
6.000 |
9.000 |
1.250 |
11.6 |
10.8 |
9.4 |
-1.8 |
334 |
A,M |
.035 |
J70008-4030-5 |
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| 300251 |
359 |
4.040 |
3.500 |
6.000 |
9.000 |
1.250 |
11.6 |
10.8 |
9.4 |
-1.8 |
338 |
A,M |
.040 |
J70008-4040-5 |
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| 300254 |
359 |
4.040 |
3.500 |
5.700 |
9.000 |
1.550 |
11.6 |
10.8 |
9.4 |
-1.8 |
372 |
A |
.040 |
J70008-4040-5 |
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| 300248 |
359 |
4.040 |
3.500 |
6.125 |
9.000 |
1.125 |
11.6 |
10.8 |
9.4 |
-1.8 |
CALL |
A,M |
.040 |
J70008-4040-5 |
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| 300246 |
359 |
4.040 |
3.500 |
6.250 |
9.000 |
1.000 |
11.6 |
10.8 |
9.4 |
-1.8 |
311 |
A |
.040 |
J70008-4040-5 |
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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.