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Pistons
Maximum Effort™ Race Pistons

1-Maximum-Effort-Race-Pistons-HRC 840442405All HRC pistons are machined on the most modern CNC equipment in the industry. They are forged from 2618-T61 aluminum for ultimate strength and fatigue resistance. The design of the CNC turned skirts allows these pistons to work properly under intense heat and severe side loads without scuffing or splitting the cylinder walls. Skirt to wall clearance on most HRC pistons is designed to operate at .004” clearance. Dome pistons are designed with radiused domes, eliminating sharp edges and “hot spots”. The valve pockets are built to handle large cam profiles and oversized valves. Pocket angles are designed to work with most angle-milled heads. Forced pin oiliers are standard, as are the aircraft quality pins that are heat-treated and end ground to work in floated or press fit applications. Double spiro lox are included. Rings are available for all stocking pistons. 

  

Bore Size, Stroke, Rod Length, Dome Volume, Comp. Ratio, Comp. Distance, Avg. Wght.
Chev SB 4VR Flat Top w/64cc
840356405 4.030, 3.480/3.500, 5.700, -5.0cc, 10.6, 1.560, 506
840342405 4.030, 3.750, 5.700, -5.0cc, 11.0, 1.425, 490
840456405 4.040, 3.480/3.500, 5.700, -5.0cc, 10.6, 1.560, 514
840442405 4.040, 3.750, 5.700, -5.0cc, 11.0, 1.425, 492
840656405 4.060, 3.480/3.500, 5.700, -5.0cc, 10.7, 1.560, 523
840642405 4.060, 3.750, 5.700, -5.0cc, 11.1, 1.425, 497
Chev SB Flat Top w/64cc
HRC4557 4.000, 3.480/3.500, 6.000, -4.0cc, 10.7, 1.268, 389
HRC4559 4.000, 3.480/3.500, 6.125, -4.0cc, 10.4, 1.133, 371
HRC4558 4.000, 3.562, 6.000, -4.0cc, 10.6, 1.227, 395
HRC4559 4.000, 3.750, 6.000, -4.0cc, 11.1, 1.133, 371
HRC4566(1) 4.155, 3.750, 6.000, -4.0cc, 11.8, 1.133, 402
HRC4576(1) 4.165, 3.750, 6.000, -4.0cc, 11.9, 1.133, 414
Chev SB Dome w/64cc
HRC4556 4.000, 3.480/3.500, 6.125, 7.8cc, 11.9, 1.125, 406
HRC4556 4.000, 3.750, 6.000, 7.8cc, 12.7, 1.125, 406
HRC4584(1) 4.030, 3.750, 6.000, 7.8cc, 13.1, 1.133, 485
HRC4582 4.155, 3.480/3.500, 6.125, 6.7cc, 12.4, 1.120, 433
HRC4582 4.155, 3.750, 6.000, 6.7cc, 13.1, 1.120, 433
HRC4581 4.155, 3.875, 6.000, 1cc, 13.0, 1.071, 406
Chev BB Flat Top w/118cc
HRC4578 4.500, 4.250, 6.385, -3cc, 9.3, 1.273, 588
Chev BB Dome w/118cc
HRC4591 4.000, 3.480/3.500, 6.125, 7.8cc, 11.9, 1.125 406
HRC4592(2) 4.000, 3.750, 6.000, 7.8cc, 12.7, 1.125, 406
HRC4586 4.500, 4.250, 6.385, 42cc, 13.6, 1.273, 562
HRC4587 4.600, 4.250, 6.535, 45cc, 14.5, 1.120, 586
Ford 302 Flat Top 64cc/58cc
HRC6342(3) 4.030, 3.400, 5.400, -5cc, 10.0/10.7, 1.100, 390
HRC6343(3) 4.040, 3.400, 5.400, -5cc, 10.0/10.8, 1.100, 392
Ford 351W Inverted Dome (Dish) 64cc/58cc
HRC6432(3) 4.030, 4.000, 6.250, -28cc, 9.2/9.7, 1.230, 438
HRC6432 (3) 4.030, 4.100, 6.200, -28cc, 9.4/9.9, 1.230, 438
HRC6433(3) 4.040, 4.000, 6.250, -28cc, 9.2/9.7, 1.230, 442
HRC6433(3) 4.040, 4.100, 6.200, -28cc, 9.4/10.0, 1.230, 442
HRC6435(3) 4.125, 4.000, 6.250, -28cc, 9.5/10.1, 1.230, 446
HRC6435(3) 4.125, 4.100, 6.200, -28cc, 9.8/10.3, 1.230, 446
Ford 351W Mini Dome 64cc/58cc
HRC6456(3) 4.030, 4.000, 6.250, 1cc, 12.4/13.4, 1.230, 413
HRC6456(3) 4.030, 4.100, 6.200, 1cc, 12.7/13.8, 1.230, 413
HRC6457(3) 4.040, 4.000, 6.250, 1cc, 12.5/13.5, 1.230, 417
HRC6457(3) 4.040, 4.100, 6.200, 1cc, 12.8/13.8, 1.230, 417
HRC6458(3) 4.125, 4.000, 6.250, 1cc, 12.9/14.0, 1.230, 461
HRC6458(3) 4.125, 4.100, 6.200, 1cc, 13.2/14.3, 1.230, 461
(1) 1/16”, 1/16”, 1/8” Ring Grooves.
(2) Designed for 10.200” Deck Blocks Only.
(3) Features .927” Piston Pins.
ProMax 2618 Race Pistons

2-ProMax-2618-Race-Pistons-HRC 840325613The X-Beam forging design produces a stronger piston than most standard pistons for the ultimate in performance. All Howards HRC Racing Pistons are forged from 2618 billet bar stock and then heat treated and aged to a T61 condition (2618-T61). This material has less than 1% silicon particulate content. High silicon content pistons (forged from 4032 or MS75) will not stand up to the most extreme stress placed on many racing pistons. If a crack starts to form in a high silicon piston it will continue until the piston experiences a catastrophic failure. Simply stated, adding sand to the aluminum only makes it more brittle. Another advantage of 2618-T61 over the high silicon pistons is the ability to keep its shape under extreme pressure and high RPM's. "Skirt Shrinking" is not a problem with Howards HRC Racing Pistons. Standard features include CNC turned skirts, oversized valve pockets with radius valve reliefs, forced pin oilers, accumulator grooves and lock removal indents. Sets include lightweight (108g) .150” wall, heat treated aircraft quality wrist pins. Double spirolox are standard. 

  
Bore Size, Stroke, Rod Length, Dome Volume, Comp. Ratio, Comp. Distance, Avg. Wght.
Chev SB Inverted Dome (Dish) w/64cc
840342128 4.030, 3.750, 5.700, -28.0cc, 8.7, 1.425, 473
840442128 4.040, 3.750, 5.700, -28.0cc, 8.8, 1.425, 478
840642128 4.060, 3.750, 5.700, -28.0cc, 8.8, 1.425, 486
Chev SB Flat Top w/64cc
840355305 4.030, 3.480/3.500, 5.700, -5.0cc, 10.3, 1.550, 510
840325305 4.030, 3.480/3.500, 6.000, -5.0cc, 10.3, 1.250, 427
840312305 4.030, 3.480/3.500, 6.125, -5.0cc, 10.3, 1.125, 405
840322305 4.030, 3.562, 6.000, -5.0cc, 10.5, 1.220, 425
840312305 4.030, 3.750, 6.000, -5.0cc, 11.0, 1.125, 405
840306305 4.030, 3.875, 6.000, -5.0cc, 11.3, 1.062, 392
840455305 4.040, 3.480/3.500, 5.700, -5.0cc, 10.4, 1.550, 456
840425305 4.040, 3.480/3.500, 6.000, -5.0cc, 10.4, 1.250, 430
840412305 4.040, 3.480/3.500, 6.125, -5.0cc, 10.4, 1.125, 428
840422305 4.040, 3.562, 6.000, -5.0cc, 10.6, 1.220, 427
840412305 4.040, 3.750, 6.000, -5.0cc, 11.0, 1.125, 428
840406305 4.040, 3.875, 6.000, -5.0cc, 11.4, 1.062, 395
840655305 4.060, 3.480/3.500, 5.700, -5.0cc, 10.5, 1.550, 464
840625305 4.060, 3.480/3.500, 6.000, -5.0cc, 10.5, 1.250, 433
840612305 4.060, 3.480/3.500, 6.125, -5.0cc, 10.5, 1.125, 413
841200306 4.125, 3.480/3.500, 6.250, -6.0cc, 10.6, 1.000, 415
841200306 4.125, 3.750, 6.125, -6.0cc, 11.3, 1.000, 415
841206306 4.125, 3.875, 6.000, -6.0cc, 11.6, 1.062, 421
841200306 4.125, 4.000, 6.000, -6.0cc, 12.0, 1.000, 415
841512306 4.155, 3.480/3.500, 6.125, -6.0cc, 10.7, 1.125, 448
841500306 4.155, 3.480/3.500, 6.250, -6.0cc, 10.7, 1.000, 420
841542306 4.155, 3.750, 5.700, -6.0cc, 11.4, 1.425, 486
841512306 4.155, 3.750, 6.000, -6.0cc, 11.4, 1.125, 446
841500306 4.155, 3.750, 6.125, -6.0cc, 11.4, 1.000, 420
841506306 4.155, 3.875, 6.000, -6.0cc, 11.8, 1.062, 434
841500306 4.155, 4.000, 6.000, -6.0cc, 12.1, 1.000, 420
841612306 4.165, 3.480/3.500, 6.125, -6.0cc, 10.8, 1.125, 452
841600306 4.165, 3.480/3.500, 6.250, -6.0cc, 10.8, 1.000, 428
841612306 4.165, 3.750, 6.000, -6.0cc, 11.5, 1.125, 452
841600306 4.165, 3.750, 6.125, -6.0cc, 11.5, 1.000, 428
841606306 4.165, 3.875, 6.000, -6.0cc, 11.8, 1.062, 441
841600306 4.165, 4.000, 6.000, -6.0cc, 12.2, 1.000, 428
Chev SB Dome w/64cc
840355613 4.030, 3.480/3.500, 5.700, 13.0cc, 13.1, 1.550, 480
840325613 4.030, 3.480/3.500, 6.000, 13.0cc, 13.1, 1.250, 464
840312608 4.030, 3.480/3.500, 6.125, 8.0cc, 12.2, 1.125, 432
840342608 4.030, 3.750, 5.700, 8.0cc, 13.0, 1.425, 472
840312608 4.030, 3.750, 6.000, 8.0cc, 13.0, 1.125, 432
840425613 4.040, 3.480/3.500, 6.000, 13.0cc, 13.2, 1.250, 464
840412608 4.040, 3.480/3.500, 6.125, 8.0cc, 12.2, 1.125, 434
840412608 4.040, 3.750, 6.000, 8.0cc, 13.0, 1.125, 434
840625613 4.060, 3.480/3.500, 6.000, 13.0cc, 13.3, 1.250, 473
840612608 4.060, 3.480/3.500, 6.125, 8.0cc, 12.3, 1.125, 438
840612608 4.060, 3.750, 6.000, 8.0cc, 13.1, 1.125, 438
841206603 4.125, 3.875, 6.000, 3.0cc, 13.0, 1.062, 436
841200603 4.125, 4.000, 6.000, 3.0cc, 13.4, 1.000, 428
841200608 4.125, 4.000, 6.000, 8.0cc, 14.3, 1.000, 437
841512608 4.155, 3.480/3.500, 6.125, 8.0cc, 12.8, 1.125, 472
841512608 4.155, 3.750, 6.000, 8.0cc, 13.6, 1.125, 472
841506603 4.155, 3.875, 6.000, 3.0cc, 13.1, 1.062, 448
841500603 4.155, 4.000, 6.000, 3.0cc, 13.5, 1.000, 448
841500608 4.155, 4.000, 6.000, 8.0cc, 14.5, 1.000, 448
841612608 4.165, 3.480/3.500, 6.125, 8.0cc, 12.8, 1.125, 476
841612608 4.165, 3.750, 6.000, 8.0cc, 13.7, 1.125, 438
841606603 4.165, 3.875, 6.000, 3.0cc, 13.2, 1.062, 452
841600608 4.165, 4.000, 6.000, 8.0cc, 14.5, 1.000, 452
Ford 302 Flat Top 64cc/58cc
860310305(3) 4.030, 3.400, 5.400, -5.0cc, 10.0/10.7, 1.100, 401
860410305(3) 4.040, 3.400, 5.400, -5.0cc, 10.0/10.8, 1.100, 405

(3) Features .927” Piston Pins.
True Seal™ Plasma Moly Ring Sets

5-Tru-Seal™-Plasma-Moly-Ring-Sets-HRC Piston-Ring-SetRace winning technology at an affordable price. Superior combustion control in today’s extreme engines. Starting with a plasma moly ring that is barrel lapped for quick seating and long life. Second rings are cast iron reverse torsional twist. The oil ring features a stainless steel expander with chrome plated carbon steel rails. Manufacturered in the most popular bore sizes. A true seal for more horsepower and longer life. All applications are file fit. 


1/16”, 1/16“, 3/16” Standard Tension
HRC4860-4000-5 4.000” Bore +.005” (File Fit)
HRC4860-4020-5 4.020” Bore +.005” (File Fit)
HRC4860-4030-5 4.030” Bore +.005” (File Fit)
HRC4860-4040-5 4.040” Bore +.005” (File Fit)
HRC4860-4060-5 4.060” Bore +.005” (File Fit)
HRC4860-4125-5 4.125” Bore +.005” (File Fit)
HRC4860-4145-5 4.145” Bore +.005” (File Fit)
HRC4860-4155-5 4.155” Bore +.005” (File Fit)
HRC4860-4165-5 4.165” Bore +.005” (File Fit)
HRC4860-4250-5 4.250” Bore +.005” (File Fit)
HRC4860-4280-5 4.280” Bore +.005” (File Fit)
HRC4860-4310-5 4.310” Bore +.005” (File Fit)
HRC4860-4350-5 4.350” Bore +.005” (File Fit)
HRC4860-4500-5 4.500” Bore +.005” (File Fit)
HRC4860-4530-5 4.530” Bore +.005” (File Fit)
HRC4860-4560-5 4.560” Bore +.005” (File Fit)
HRC4860-4600-5 4.600” Bore +.005” (File Fit)
1/16”, 1/16“, 3/16” Low Tension
HRC4862-4030-5 4.030” Bore +.005” (File Fit)
HRC4862-4040-5 4.040” Bore +.005” (File Fit)
HRC4862-4125-5 4.125” Bore +.005” (File Fit)
HRC4862-4155-5 4.155” Bore +.005” (File Fit)
HRC4862-4165-5 4.165” Bore +.005” (File Fit)
HRC4862-4500-5 4.500” Bore +.005” (File Fit)
HRC4862-4600-5 4.600” Bore +.005” (File Fit)
1/16”, 1/16“, 1/8” Standard Tension
HRC4870-4030-5 4.030” Bore +.005” (File Fit)
HRC4870-4040-5 4.040” Bore +.005” (File Fit)
HRC4870-4155-5 4.155” Bore +.005” (File Fit)
Tool Steel Wrist Pins

3-Tool-Steel-Piston-Pins-HRC 91252The most over looked upgrade to a competition engine. Precision machined from solid H-11 bar stock, heat treated and triple tempered, and centerless ground to 0.0001” total tolerance. Inner diameters are honed on Sunnen equipment to precise size and finish requirements, while the outside diameter features a slight O.D. edge break to maintain maximum bearing area. These pins will give you the best strength to weight ratio available. Sets of 8. 


Ford SB .912” x 2.500”
HRC91250 .912” x 2.500”, .090” Wall, 75g
HRC91252 .912” x 2.500”, .120” Wall, 96g
Chev SB .927” x 2.500”
HRC92250 .927” x 2.500”, .090” Wall, 76g
HRC92252 .927” x 2.500”, .120” Wall, 98g
HRC92258* .927” x 2.500”, .115-.145” Wall, 118g
Chev SB .927” x 2.750”
HRC92272 .927” x 2.750”, .120” Wall, 106g
Chev SB .927” x 2.950”
HRC92292 .927” x 2.950”, .120” Wall, 115g
HRC92298* .927” x 2.950”, .125-180” Wall, 143g
Chev BB .990” x 2.930”
HRC99292 .990” x 2.930”, .120” Wall, 123g
HRC99293 .990” x 2.930”, .130” Wall, 130g
HRC99295 .990” x 2.930”, .150” Wall, 147g

*Taper Wall.
Spiral Locks

4-Spiral-LocksHigh quality replacements for most popular performance pistons. Sold in sets of 32. Note: Spiral Locks are not designed to be reusable. You should always use a new set each time you remove and reassemble the piston and rods. 4 required per piston. 


927-042 For .896”-.945” Pins
990-042 For .946”-1.005” Pins
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