You guys worry too much.
Engine builders that do this everyday don't have an issue with SADI cores in street-type applications. Much better deal than worrying about bronze tip FP pushrods, etc. There are millions of SADI hydraulic rollers in service without issue. Not suitable for big lift and high spring loads, but fine for the average mild street cam.
The late Joe Sherman:
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I to, also use them all the time in street engines with no problems at all. It sure makes the distributor gear a NON ISSUE.
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Another:
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I think they make for better street life than the "Steel". In low lift and moderate perfomance I will use one and not look back. Over the years I've had many come through the shop.
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http://www.speedtalk.com/forum/viewt...hp?f=1&t=38241
Another good one....
http://speedtalk.com/forum/viewtopic.php?f=1&t=30456
No issues with my Howards SBC SADI cam, but I am only running a 300 lb over the nose beehive spring and 1.5 rockers. If I were running .650" lift and 450 lb over the nose, I probably wouldn't want a cast core.
Bottom line: SADI is fine for the intended application.