427/428 "FE" FLAT TOP
Specially designed for the latest aftermarket blocks and heads, these pistons are for use with the aftermarket 4.250" crank and aftermarket 6.700" rods. The factory block should be sonic checked for 4.280" and 4.310" bores. These pistons use 1/16, 1/16, 3/16 rings. The compression ratios are figured for 10.150 block height. Larger bore sizes available as customs, call JE for details.
Includes:
Pin#990-2930-15-51S (150g)
Double spiro locks (#990-042-CS)
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427 FLAT TOP SERIES
Std Bore: 4.233
Ring package designed for: 1/16, 1/16, 3/16 Rings
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 72cc |
74cc |
88cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 242933 |
482 |
4.250 |
4.250 |
6.700 |
10.150 |
1.325 |
12.3 |
12.1 |
10.6 |
-5.0 |
513 |
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0.017 |
J100F8-4250-5 |
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| 242934 |
489 |
4.280 |
4.250 |
6.700 |
10.150 |
1.325 |
12.5 |
12.3 |
10.8 |
-5.0 |
518 |
M |
0.047 |
J100F8-4280-5 |
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| 242935 |
496 |
4.310 |
4.250 |
6.700 |
10.150 |
1.325 |
12.7 |
12.5 |
11.0 |
-5.0 |
528 |
M |
0.077 |
J100F8-4310-5 |
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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.