Senior Tech Team
Join Date: Sep 1998
Location: Mustang, OK USA
Re: What bell housing for a 454?
The 454 uses an EXternally balanced flywheel which is the larger, 14in diameter and has 168 teeth. Thus, you have to use a larger bell housing such as the 621 to accomodate the larger flywheel.
Additionally, the 11in clutch will NOT fit the smaller 153 teeth flywheel.
If you use a GM Delco style starter, you MUST get a starter that has the CAST IRON nose and a staggered bolt pattern.
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