Performance Parts and Racing Parts Campbell Enterprises

Ross Big Block Chevy Pro Mod 18° Nitrous Special High Compression Pistons

Ross BBC Pro Mod Nitrous Pistons

Forged high compression BBC Pr Mod from ROSS Racing Pistons are designed specifically for use in Pro Mod engines using large nitrous shots. Ross forged pistons incorporate unique design features to provide high strength and take advantage of precision machining and premium materials to build a forged piston you can depend on. The Ross Racing Pistons Big Block Chevy high compression pistons on this page are made especially for use in all our drag racing engines.

ross racing pistons pro mod drag racing car

We offer unbeatable prices, personalized service, tech help if you need assistance and fast shipping on the entire Ross Racing Pistons product line. Order today to enjoy all the performance benefits a premium forged piston provides.

BBC Special Pro Mod 18° Nitrous High Compression Pistons

Ross 18 degree Nitrous Pro Mod High Compression PistonROSS high compression nitrous pro mod pistons for BBC engines using 18 degree heads are for use in serious competition applications.

pistons listed in this section feature special hollow dome forgings for maximum strength with minimum weight. Designed for use with open chamber heads. These pistons are designed for intake valves up to 2.300" diameter and exhaust valves up to 2.050" diameter. Suitable for nitrous systems of 250 horsepower or less. Pins included are 5115 series straight wall .990 diameter, aircraft quality and are retained by double spiro lox or can be press fitted into rods.


  • TECH-TIP For use in hard core drag racing engines only with 17º and 18º Dart Big Chief, Brodix Big Duke, and Brodix Pontiac Heads
  • BLOCK HEIGHT As noted in table below
  • COMPRESSION RATIO Based on .050 piston to head clearance (deck and gasket combined)
  • Ring Grooves.043, 1/16, 3/16
  • APPLICATIONS Street, Drag Racing, Marine (optional taper bore pins recommended for high horsepower applications)
  • WHAT’S INCLUDED 8 forged pistons, no wrist pins included
Block Deck Height Bore Stroke Rod
C.H. Dome

Compression Ratio with Head cc of:

Weight Piston Set
82 85 97
9.800 4.600 4.25 6.535 1.12 14 15.3 14.8 13 628

99827 (1)

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9.800 4.600 4.25 6.385 1.27 14 15.3 14.8 13 630 99830 (2)

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10.200 4.600 4.75 6.7 1.12 14 17 16.4 14.5 628 99827 (1)

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10.200 4.600 4.25 6.8 1.27 14 15.3 14.8 13 665 99830 (2)

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9.800 4.625 4.25 6.535 1.12 14 15.5 15 13.2 641 99828 (3)

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9.800 4.625 4.25 6.385 1.27 14 15.4 15 13.2 672 99829 (4)

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10.200 4.625 4.75 6.7 1.12 14 17.2 16.6 14.6 641 99828 (3)

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10.200 4.625 4.25 6.8 1.27 14 15.4 15 13.2 672 99829 (4)

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NOTE: A number after the piston set part number indicates which Ross part number pin buttons are required: (1) B460; (2) B460-1; (3) B462; (4) B462-1

Custom BBC Pistons for Heavy Nitrous Use

If you do not see pistons here with the specifications that you need we sell custom forged pistons for most any engine project. Please contact us if you would like to discuss a set of custom pistons and we will be happy to work with you to make sure you get exactly the engine pistons you need.


Ross Forged Racing Pistons Catalog Index


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