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Old 11-28-2017, 09:17 PM
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lust4speed lust4speed is offline
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Join Date: Jul 2002
Location: Yucaipa, SoCal
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Here's an SR block that is in a 68 GTO Convertible. Later casting date number of September 23, 1971, smaller SR number, has the 5 engine mount holes, and drilled for 4-bolt mains with 2-bolt caps.

Did the SR numbers start over every year?
Attached Thumbnails
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ID:	468897   Click image for larger version

Name:	Casting date Shier block.jpg
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Name:	Casting number Shier block.jpg
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Name:	SR Number Shier block.jpg
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ID:	468900  

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1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.