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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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Ricky H.

Ricky H.

Thanks for everything John. The headers are great !
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Gary H.

Gary H.

John, Thanks a lot !
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David A.

David A.

Thanks for everything, David
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Michael W.

Michael W.

After getting all the compatible stuff shes a beast! Michael
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Clay B.

Clay B.

Thanks for everything !
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Matt C.

Thanks again John, someone who’s willing to help and not just sell parts. So, looks like you’ll be listed on my referrals. Keep in touch. Thanks...
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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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Robert S.

Robert S.

Great parts and service! Robert
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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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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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Derek B.

Derek B.

Great Personalized service. Derek
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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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Bill S.

Bill S.

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

Bruce P.

John, you have been so prompt and helpful. Take care my friend and thanks again. I'll be back. Bruce
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Carl E.

Carl E.

Dodge SRT-10 Viper
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Taylor M.

Taylor M.

Thanks a lot John !
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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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Robert S.

Robert S.

426 Hemi Cuda
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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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Scot C.

Scot C.

Thanks for everything John. We will be doing business again. At Nationals 6.38 on a 6.54 dial in.
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Phil S.

Phil S.

Great job creating this Dakota R/T Ground Affects Kit. Phil
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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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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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Buick GN1 Aluminum Cylinder Heads

From the all out competitor to the performance street enthusiast the GN1 aluminum head is the preferred choice. In 1990 we had a goal. Produce an aluminum cylinder head for the Buick V-6 turbo that was superior in both performance and affordability than anything on the market. In 2002 more than a decade after establishing this goal the Champion GN1 head has achieved this many times over. With hundreds of heads in service the GN1 head is a proven winner. The GN1 head is precision cast from 356-T6 Aluminum Alloy. The aluminum castings are machined in our facility on a state of the art CNC machining center. This provides us with complete control of the quality and machine scheduling to assure the finest quality product possible and to have product in stock at all times. Custom-built machining fixtures allow the majority of machined elements to be completed in one setup thus maximizing the accuracy and consistency of their location. Research and development is another key element in Southeast Performance on going commitment to a product that leads the competition. After extensive testing, changes that are found to enhance the performance of the GN1 head can be incorporated into the product almost immediately. The in house R&D and manufacturing teams work together to bring new innovative ideas to market as soon as possible. Special Machining Features Include: •CNC machined 46cc combustion chambers for consistent volume and shape. •Precision mill bored valve guide bores provide fine surface finish for optimum heat transfer. •Radii on head bolt spot faces to reduce stress risers that can lead to cracking. •Thread milled spark plug ports assure consistent precision fit to plugs. •Precision milled finish on all gasket surfaces. •CNC contour machined multi angle valve seats provide superior geometry, roundness, and surface finish. Key design features for the GN1 heads: •Valves are moved closer to cylinder bore centerline to unshroud valves for more flow. •Spark plugs are moved closer to cylinder bore center for improved combustion •Special combustion chamber shape for maximum efficiency. •Large 1.900" intake and 1.600" exhaust valves. •High flow as cast intake and exhaust ports. •Accepts stock rocker arms and stock valve covers. •Lightweight compared to cast iron head. GN1 aluminum heads will accommodate stage I or stage II blocks and three different rocker arm configurations. They are available as complete assembled units or fully machined bare castings. On the track or the street the Southeast Performance GN1 Aluminum head for the turbo V-6 is an excellent choice.




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