On my 421 build the cam went into the first 4 bearings but wouldn’t go in any further so we used a homemade reamer:
https://forums.maxperformanceinc.com...9&postcount=27
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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