SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
B/B NITROUS SERIES DOME

These big block pistons have ring lands designed specifically for nitrous applications. Valve reliefs are designed to accept oversized valves and long duration, wide lobe separation camshafts, they are also compatible with angle milled heads. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Fits open chamber cylinder heads.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Double pin oilers
Accumulator Grooves

502 SERIES
Std Bore: 4.466
Ring package designed for: 1/16, 1/16, 3/16 Rings
 Tech and Installation Tips
 Valve Relief Diagram
Part # Cubic
Inches		 Bore Stroke Rod
Length		 Block
Height		 Compression
Distance
Head Cubic Centimeters
110cc 118cc 124cc
Compression Ratio
Dome
Volume		 Gram
Weight		 Footnote Oversize
258238 540 4.500 4.250 6.385 9.780 1.270 15.7 14.3 13.4 45.0 641 B 0.034
258239 548 4.530 4.250 6.385 9.780 1.270 15.9 14.5 13.6 45.0 657 B 0.064
258240 555 4.560 4.250 6.385 9.780 1.270 16.0 14.6 13.7 45.0 668 B 0.094
258197 560 4.580 4.250 6.385 9.780 1.270 16.1 14.7 13.8 45.0 677 B 0.114
258241 565 4.600 4.250 6.385 9.780 1.270 16.3 14.8 13.9 45.0 686 B 0.134
258198 568 4.610 4.250 6.385 9.780 1.270 16.4 14.9 14.0 45.0 693 B 0.144


- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.

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