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Customers

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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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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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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Jim W.

Jim W.

Thanks for the fast parts service and Great cylinder head porting! Jim
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Chris B.

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

Super guy to deal with! GREAT SERVICE!! GREAT PRICE!!
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David P.

David P.

Thanks for the brake lines !
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Taylor M.

Taylor M.

Thanks a lot John !
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Pete L.

Pete L.

Mopar RB 440 Aluminum block with a Procharger. Makes 1600 HP!!
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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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Ricky R.

Ricky R.

1937 Chevy Legends Race Car, Thanks for everything!
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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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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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Hannu O.

Hannu O.

thank you very much from Finland!
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Craig W.

Craig W.

Thanks John, So far 8 races and 8 top Five!!
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Ricky H.

Ricky H.

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

Gary H.

John, Thanks a lot !
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Billy W.

Billy W.

Dakota R/T 408
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Robert S.

Robert S.

426 Hemi Cuda
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Darren B.

Darren B.

John,Racing flat out on the 440/533 engine over 1 season & 65 passes at 8.97@150mph 1.27 60' getting great results!!Engine is GREAT!Thanks mate!
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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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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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