Pre Stage Block

Bakn2Gns

Member
Nov 25, 2008
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I have a line on a block I’ve never heard of. It’s a pre Stage Block although stronger and beefier than early production blocks. Possibly a 4.1L with two center 4 bolt main caps. Possibly has an x in the casting number. I’ll know more soon but any info would be a great help. I can’t seem to find much on this early pre Stage Block. Thanks!!!!
 
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750H.P.V6

Old confused member
Sep 4, 2001
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If you have a copy of the Buick Power source manual it seems to me there are a couple pictures of Stage II blocks that aren't off center blocks. They appear to be of an earlier vintage. There were heavy duty blocks cast that per-date the Stage I and II blocks. If you end up getting it post some pics it would be cool to check it out.

Neal
 
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Spooln1

Member
Feb 9, 2010
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Streamwood, Illinois
I also have an X block that is currently being built. I don't know if it was pre stage 2 stuff or during as an experimental testing for the Buick race teams. Its an on center block with all 4 bolt caps. I'll try and post some pics here to reference.
 
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750H.P.V6

Old confused member
Sep 4, 2001
3,093
474
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Sunny Califonia
4X castings were pre-production parts. There were quite a few as the Buick Motorsports program progressed thru the years. The block that the OP was asking about would be much earlier. If it really is a Buick H.D. block which pre dates the Stage blocks it would be from the late '70's possibly very early '80's. I still want to see pics.

Neal
 
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