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A New Product->
Air Conditioning Custom Kits->
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Brakes->
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Custom Hoods->
Custom Parts Development->
Cylinder Head Porting->
Electric Cooling Fans->
Electronics and Delay Boxes->
Engine Parts->
  |_ Camshaft Thrust Buttons->
  |_ Camshafts->
  |_ Cylinder Heads->
  |_ Dodge SRT4 Turbo->
  |_ Engine Components->
    |_ Connecting Rods->
    |_ Crankshaft Dampers->
    |_ Crankshafts->
    |_ Engine Bare Blocks->
    |_ Engine Bearing Spacers
    |_ 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->
Engine Swap Kits
Engines->
Exhaust Components->
Exterior Vehicle Components->
Fasteners->
Fire Equipment->
Floor Mats->
Fuel Injection Systems
Fuel System Components->
Gaskets->
Gauges->
Gear Venders Overdrive Units
Ignition Components->
Lift Kits->
Lowering Kits->
Nitrous Kits->
Race Car Bodies->
Race Wear and Accessories->
Radiators and Components->
Rear End->
Roll Cages and Accessories->
Seats and Custom Interiors->
Shocks->
Spark Plugs->
Striker Viper heads Return
SuperChargers->
Suspension Components->
Tech Help
Throttle Bodies->
Tires->
Traction Components->
Transmission Components->
Tuning and Controllers->
Turbocharging->
Valvetrain Components->
Viper
Water Pumps->
Wheels->
Wideband Monitoring Systems->
Wiring harness and Accessories->

Customers

Kyle M.

Kyle M.

John, I am very pleased with the brake conversion. The kit was very easy to install and I didn't have any problems and look very good as...
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Carl E.

Carl E.

Dodge SRT-10 Viper
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Mitch C.

Awesome work! Glad I went with you guys! Anyone I know of that wants to build I'll send your way! Thanks John! Your the man!! Mitch
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Chris B.

Chris B. won the late model feature easily Texas Motor Speedway.
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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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Dan B.

Dan B.

Dakota R/T 408, Thanks for everything! Dan https://www.youtube.com/watch?v=wZekmXKYXA4
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Harold R.

John, Thanks for the great customer service! Harold
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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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Daryl S.

Your 408 runs like a dream. I think we are well over the 400hp side, a new 300hp mustang could not overcome, it is a beast. I am very happy with the...
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Steve F.

Thank You for all your help and hookups with the parts - sounds like a lot of people appreciate it, I'm one of those people. - Steve
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Taylor M.

Taylor M.

Thanks a lot John !
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David P.

David P.

Thanks for the brake lines !
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Rob D.

John is a real awesome guy. i couldn't thank u enough for all the help over 7-8 years.
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Brian R.

John!! Got my Viper back together, dyno tuned. Super happy with the results of your work!! Gained 112 RWHP and 107RWTQ!!!!! More at the crank. Sounds...
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Bill S.

Bill S.

Thanks John, 426 Hemi stroker 588 https://www.youtube.com/watch?v=1dJdt0ZFzjU
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Henry T.

Henry T.

HEY! Everything is installed and car runs AWESOME! Thanks for everything, Thanks again. Henry 2000 Dodge Viper R/T 10
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William K.

You do outstanding work man. My whole crew is ready to see your work in action ;-)
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Ricky H.

Ricky H.

Thanks for everything John. The headers are great !
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Kayden G.

Kayden G.

Well your service is amazing. Never had better from any company I've ordered from! Kayden
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Steve B.

Steve B.

Thanks for the help with my 426 stroker.
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Jim W.

Jim W.

Thanks for the fast parts service and Great cylinder head porting! Jim
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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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Josh F.

I've bought parts and dealt with vendors in my job every day for the last 15 years. I have never dealt with a vendor as helpful and punctual as you...
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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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Robert S.

Robert S.

426 Hemi Cuda
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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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