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Customers

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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Billy W.

Billy W.

Dakota R/T 408
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Jason B.

Thanks John.. you have been awesome to work with and I am REALLY looking forward to driving my SRT-10 again :) Jason
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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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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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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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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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Ricky R.

Ricky R.

1937 Chevy Legends Race Car, Thanks for everything!
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Gary H.

Gary H.

John, Thanks a lot !
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Hannu O.

Hannu O.

thank you very much from Finland!
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Maurice

Maurice

Maurice 73 Dodge Dart
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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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Robert S.

Robert S.

426 Hemi Cuda
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Taylor M.

Taylor M.

Thanks a lot John !
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Robert S.

Robert S.

Great parts and service! Robert
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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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Dan B.

Dan B.

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

Troy K.

Thanks for all your great help with my Viper.
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Buyer

Super guy to deal with! GREAT SERVICE!! GREAT PRICE!!
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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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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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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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