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  |_ Camshaft Thrust Buttons->
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    |_ Brodix
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    |_ Koffel's Place
    |_ Mopar Performance
    |_ Pro-Filer Cylinder Heads
    |_ Sidewinder Mopar Cylinder Heads
    |_ Stage V Cylinder Heads
    |_ Trick Flow Cylinder Heads
    |_ World
  |_ Dodge SRT4 Turbo->
  |_ Engine Components->
  |_ Engine Girdles->
  |_ HEMI 5.7L, 6.1L, 6.4L Components->
  |_ Intake Manifolds->
Engine Swap Kits
Engines->
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Striker Viper heads Return
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Tech Help
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Viper
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Customers

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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Taylor M.

Taylor M.

Thanks a lot John !
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Ian A.

Ian A.

I wanted to thank you for all your help and support, for being so patient and for being a good, honest person and especially so professional....
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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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Steve B.

Steve B.

Thanks for the help with my 426 stroker.
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Harold R.

John, Thanks for the great customer service! Harold
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Ricky J.

Thanks for all the info, you have been a great help and a credit to your company.
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Derek B.

Derek B.

Great Personalized service. Derek
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Robert S.

Robert S.

426 Hemi Cuda
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Jim W.

Jim W.

Thanks for the fast parts service and Great cylinder head porting! Jim
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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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Michael W.

Michael W.

After getting all the compatible stuff shes a beast! Michael
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Carl E.

Carl E.

Dodge SRT-10 Viper
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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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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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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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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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Ken L.

John, Thanks for all your help. I wish I had known about you before I ordered the rest of my stuff! Thanks, Ken
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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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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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Chris B.

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

Benny C.

Thanks for the Great Mopar Service !
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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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World Products

This is the cylinder head that highly respected drag racers like Scotty Richardson employ to win NHRA National event titles and literally hundreds of thousands of dollars in high stakes ET Bracket Races. Merlin III is a true high performance head, capable of supporting in excess of 800 HP out of the box. Take your pick between 310cc or 350cc intake runners. Assemblies include premium quality Manley RaceMaster or Severe Duty valves.

World Products offers heads in both aluminum and cast iron. For street engines, We recommend cast iron heads over aluminum. "Iron is better where weight or looks are not a factor because it retains heat better than aluminum and keeps the heat in the combustion chamber, which is where you want it. Cast iron heads will typically give you about 10 to 15 more horsepower than an identical set of aluminum heads on a street engine. As for the weight difference, a pair of cast iron small block Chevy heads weighs about 30 lbs. more than a set of aluminum heads. On a big block Chevy, the weight difference is about 85 lbs., which doesn't make much difference on a crew cab truck or RV, but does in a race car. For racing, you want the lighter aluminum heads."





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