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Buick Motorsports Stage Block Builds
Buick Motorsports 3.8L and 4.1L Stage I and II Block Builds


 
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Product Code: WRE-BMSB
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Description
 
Weber Power Products not only builds GM production blocks and TA aluminum blocks for turbo applications, but also those that were produced exclusively for Buick Motorsports.  Buick Motorsports 3.8L and 4.1L stage I and stage II blocks provide a solid foundation for those that want to produce the most boost and horsepower possible.  Although Stage I and II cylinder blocks are in short supply, Weber Power Products continues to build these engines to this day.

Because of the uniqueness of Buick Motorsports stage blocks, and the previous machine work that may have been performed on them, it is extremely difficult to provide an accurate build quote without first inspecting the block, cylinder heads and related components.  Therefore, we would ask that you please call us to discuss your stage build options.  Please note that some provisioning to stage I and II Buick blocks, such as installing coolant drain plugs as an example, does add to the cost of the build.

Below you will find some of the common casting numbers for 3.8L and 4.1L Buick stage I and stage II engines.  It is our hope that these casting numbers will help you in identifying your Buick Motorsports block.

Stage I 3.8L OffCenter Cylinder Block - Casting Number 25500012
Stage I 4.1L OffCenter Cylinder Block - Casting Number 25500016
Stage II 3.8L OffCenter Cylinder Block - Casting Number 25500012
Stage II 4.1L OffCenter Cylinder Block - Casting Number 25500017
Stage II 4.1L OnCenter Cylinder Block - Casting Number 25500153

Although Buick Motorsports stage blocks and heads are difficult to find in good condition, many opt to have us use their production 3.8L Buick core to build a strong block with billet caps or a girdled block for even more strength and durability.

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