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Engine Parts->
  |_ Camshaft Thrust Buttons->
  |_ Camshafts->
  |_ Cylinder Heads->
  |_ Dodge SRT4 Turbo->
  |_ Engine Components->
    |_ Connecting Rods->
    |_ Crankshaft Dampers->
    |_ Crankshafts->
    |_ Engine Bare Blocks->
    |_ Engine Bearings->
    |_ Engine Block Main Caps->
    |_ Engine Rotating Assemblies->
    |_ Lifters->
    |_ Mopar B/RB Windage Tray
    |_ Oil Pans->
    |_ Oil Pumps->
    |_ Piston Rings->
      |_ Akerly & Childs
      |_ Childs & Albert Piston Rings
      |_ Eagle Piston Rings
      |_ GM Performance Piston Rings
      |_ JE Pro Seal Piston Rings
      |_ Keith Black Piston Rings
      |_ Mahle Piston Rings
      |_ Perfect Circle Piston Rings
      |_ Ross Piston Rings
      |_ Speed Pro Piston Rings
      |_ SRP Piston Rings
      |_ Total Seal Piston Rings
      |_ Wiseco Piston Rings
    |_ Pistons->
    |_ Pushrods->
    |_ Timing Chain sets->
  |_ Engine Girdles->
  |_ HEMI 5.7L, 6.1L, 6.4L Components->
  |_ Intake Manifolds->
Engines->
Exhaust Components->
Exterior Vehicle Components->
Fasteners->
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Floor Mats->
Fuel Injection Systems
Fuel System Components->
Gaskets->
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Gear Venders Overdrive Units
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Lift Kits->
Lowering Kits->
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Race Car Bodies->
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Rear End->
Roll Cages and Accessories->
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Striker Viper heads Return
SuperChargers->
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Tech Help
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Transmission Components->
Tuning and Controllers->
Turbocharging->
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Viper
Water Pumps->
Wheels->
Wideband Monitoring Systems->
Wiring harness and Accessories->

Customers

Hannu O.

Hannu O.

thank you very much from Finland!
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Benny C.

Benny C.

Thanks for the Great Mopar Service !
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Felix C.

How awesome is this! This superb service is exactly on point w/what everyone have raved about. Thank you, Felix
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Kris L.

John, Sitting in the car with a big smile on my face. Thanks for the quality brand products and the great price. Cheers Kris
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Barbara H.

John, Thanks again for making Colton's dream come true! The truck is in the body shop, the cowl hood arrived and the new 408 engine you built is...
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Craig W.

Craig W.

Thanks John, So far 8 races and 8 top Five!!
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Michael D.

I just wish there were more guys like you around for us gen3 guys. Most just want a sale and don't care to actually help let alone give advice or...
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Tom R.

John--the 408 engine you built for me is outstanding. Feel free to give him my cell number and I'll happily give you a strong reference. Thank you...
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Jared B.

John, You Rock! Thanks again for the great deals and speedy service. Really appreciate it. Jared Dakota R/T
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Bob F.

Bob F.

Plymouth 426 Hemi
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Colton H.

Colton H.

"Johns the man, bought a 410 package from him years ago after I got back from overseas. The caveat I gave John was that it had to pass Californian...
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James G.

James G.

5.80 in 1/4 mile @ 244 mph & 3.76 @ 197 in the 1/8 mile
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Robert M.

John, Thank you for all you have done, From your previous email responses, you seem to be old school, a man of his word. Thanks again John for...
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Clay B.

Clay B.

Thanks for everything !
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Shaine D.

Wow! Thank you for that quick and informative response. Must be why you are always recommended. Shaine
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David P.

David P.

Thanks for the brake lines !
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Ryan

bought numerous things and all transactions went very smooth. Responded to emails within a day or less. Ryan
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Carl E.

Carl E.

Dodge SRT-10 Viper
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Robert S.

Robert S.

426 Hemi Cuda
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Derek B.

Derek B.

Great Personalized service. Derek
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Don S.

John, I can't emphasize this enough, but without the help you're getting me I could not have afforded my dream engine! I literally have cringed when...
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Alan P.

First off, I just have to say that I have never came across a more stand-up guy that takes his time to connect with his customers and have the...
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Brian A.

Brian A.

The 408 engine runs strong, put on dyno 405hp with 415tq N/A not shabby.. also was on 22" wheels with those numbers est. 500-525 @ crank. Thanks so...
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Andrew R.

Andrew R.

I am very pleased with the quality of the magnum deep pan, and the best part is that it really is not much deeper than the stock pan so I dont have...
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Jim A.

Jim A.

Two year champion in modified tractor pulling classes named "Watch This Trick". Chrysler 426 Hemi. Thanks for the Great Service!
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Perfect Circle Piston Rings

Perfect Circle® performance rings are the most extensive and technically advanced high performance rings in the industry. Driven by today's requirements for reduced oil consumption, lower friction, higher power output, and longer life, Perfect Circle is out front with the latest technology. Off the shelf sets, individual rings and custom finished rings are all available from Perfect Circle.

Tapered Hook Groove (THG)
 The second compression ring on a piston contributes significantly to engine performance, particularly in racing applications. Unfortunately engine builders often overlook the importance of this ring when selecting a compression ring. Reverse torsional twist second rings have been the industry standard for many years, but offer only a limited performance advantage. If back pressure buildup from combustion gases leaking past the top ring is not controlled, it can cause the top ring to float, breaking the combustion seal and reducing power.

This is why Perfect Circle® has introduced a new design in rings called the Tapered Hook Groove (THG) rings. These rings provide slightly better oil control than a reverse twist, taper-face ring, but most importantly, the new second ring acts as a check valve to relieve excessive combustion pressure build-up under the top ring, thus, stabilizing it and reducing the possibility of compression gases being trapped between the top and second ring.

Fire-Power™
 Perfect Circle® Fire-Power piston ring sets are engineered to withstand the punishment of today's high powered, Nitrous-Oxide injected, Turbocharged, and Supercharged race applications. PC479 compression rings will provide superior ring durability, stable radial tension, superior combustion sealing and oil control, while protecting the cylinder walls. All these benefits will net additional horsepower while extending engine life. Perfect Circle's Fire-Power rings can be purchased in boxed engine sets as well as open stock to meet your performance requirements.

Import Performance
Perfect Circle® import applications utilize the latest technologies popular in today's racing piston ring sets with Reduced Radial Wall (RRW) Steel top rings, Reduced Axial Height second rings, and CP-20™ High Conformability/Low Friction oil rings. Both standard, and low tension oil rings are available to best maximize power output in naturally aspirated or power assisted engine combinations.

Claimer Race
Perfect Circle® claimer performance piston ring sets are engineered for oval track claimer series engines. These economy performance ring sets feature many of the same benefits as our race proven premium sets at an economical price. Positively Twisted 5/64" or 1/16" top rings provide outstanding high RPM sealing in a choice of Plain Cast Iron or Moly-Plasma face coatings. These sets also utilize a 5/64" Tapered Face ring or a 1/16" THG, which provides unmatched oil control in race conditions. CP-20™ oil rings are also utilized in Standard Tension and Low Tension for optimum power output.

Top NASCAR and NHRA teams know the importance of quality piston rings - that is why they trust Perfect Circle piston rings every weekend for quality and performance.




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