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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
426 HEMI

Machined from high Silicon 4032 alloy for tighter, quieter running clearances (part # 131834 is manufactured from 2618 alloy which by design requires slightly more cylinder to piston clearance). All part numbers utilize an application specific forging for a more efficient dome shape. These pistons are the perfect choice for your street Hemi engine. Valve pockets have been engineered to accommodate oversized valves and long duration, tight lobe separation cams. 4032 alloy pistons are precision CNC machined for 5/64, 5/64, 3/16 factory style rings. 2618 alloy pistons are CNC machined for 1/16, 1/16, 3/16 rings.

Includes:
Pin #031-2930-17-51S (175g)
Double spiro locks (#031-042-CS)

426 SERIES (4032 ALUMINUM ALLOY)
Std Bore: 4.250
Ring package designed for: 5/64, 5/64, 3/16 Rings

 Tech and Installation Tips
 Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
168cc   174cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
232517 528 4.500 4.150 6.860   1.795 10.4 - 10.0 62 900   0.250 J10008-4500-5
131850 426 4.255 3.750 6.860   1.955 10.7 - 10.1 88 830   0.005 JP00F8-4250-5
118758 431 4.280 3.750 6.860   1.955 10.8 - 10.2 88 823   0.030 JP00F8-4280-5
118759 433 4.290 3.750 6.860   1.955 10.8 - 10.2 88 842   0.040 JP00F8-4290-5

426 SERIES (2618 ALUMINUM)
Std Bore: 4.250
Ring package designed for: 1/16, 1/16, 3/16 Rings
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
168cc   174cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
131834 472 4.255 4.150 6.860   1.765 11.7 - 11.1 98 771   0.005 J10008-4250-5

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