Modify Paragraph 2.3 as follows: “Any bellhousing pertaining to this specification shall remain as constructed by the original manufacturer and not modified.  If a bellhousing is tested to this specification with the addition of a liner or liners, then the product must be sold and certified in that configuration. The liner(s) must be flush with the flange/mounting surface of the bellhousing. Steel and titanium are the current acceptable materials. Aluminum is also acceptable if used with a steel or titanium liner. The use of any other material must be reviewed by the committee for consideration.”

*Implementation Clarification: Spec Paragraph 16.0 requires compliance with this latest specification version within 90 days of the effective date for new product. Therefore, newly manufactured bellhousings must comply with the above requirement as of November 15, 2012. Existing bellhousings in the field may be brought into compliance upon their next scheduled inspection and recertification by the manufacturer.

NHRA NOTE: This applys to all SFI 6.1, 6.2 and 6.3 bellhousings.  For SFI 6.1 and 6.3 bellhousings the liner may be notched/relieved in the starter pocket area to clear the starter gear housing/nose.