I belive even a 3" hole works. The stock opening is way bigger than needed. I used a 3" saw that I already had.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1968 400 coupe - R/A clone (Blue Pearl) (for sale) 1968 350 - 4 speed 'vert - 400 clone (the beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 1967 326 convertible - Sold 2008 Durango - winter beater 1980 T/A SE Bandit - Sold 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1976 T/A - 455, 4 spd. Newest hatchling in the nest.