I bought a 1/4NPT tap and tapped the block hole for an NPT plug. I love my Canton pan. The baffles and built-in scraper are awesome. Mine fit without any problems and cleared the K-member by more than 1/2" (some people have trouble here and have to notch their K-member). I cut my stock pan rail stiffeners to fit the Canton pan for a little added security against leaks.
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Jeff Chambers
Trophy Stock #3
11.86 Seconds / 113.8 MPH
Chambers Racing Team