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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2012 Posts: 37 New Guy | | New Guy Joined: Mar 2012 Posts: 37 | I'm doing a small block swap in my 49 3100 and I was wondering if anyone had any pics on how they modified the firewall for the bell housing and how they made the tunnel for the trans | | | | | Joined: Jun 2009 Posts: 1,596 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 1,596 |  I've seen a lot done without modifying the firewall or floor. Are you doing any other mods or just this? | | | | | Joined: Jan 2009 Posts: 1,644 Shop Shark | | Shop Shark Joined: Jan 2009 Posts: 1,644 | Just did one on a 55 frist and did not have to do anything to the fire wall or the floor.Put in a SBC and a 700 4r trans.
Pete | | | | | Joined: Jul 2007 Posts: 328 'Bolter | | 'Bolter Joined: Jul 2007 Posts: 328 | I agree….
Like 46GMCpu …..
I have a 455 Buick and a turbo 400 in my 51 panel and zero firewall or tunnel issues.
A small block should have loads of room without any firewall mods.
| | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | ....52 panel. Installed a small block Chevy. Did not modify firewall. Used a BIG distributor and can still get my hand between the dist. and firewall. I set my engine in using this layout. http://i140.photobucket.com/albums/r19/LutherParris/52Panel/Engmount.jpgEDIT: I did trim about 1/2" off at the front of the transmission hole where the tranny came against it when leveling the engine...but just a little.
Last edited by Achipmunk; 03/22/2014 2:50 AM.
| | | | | Joined: Oct 2005 Posts: 4,261 "Hey! I sound like Darth Vader!! | | "Hey! I sound like Darth Vader!! Joined: Oct 2005 Posts: 4,261 | If I remember correctly, my '49 had the engine set so far back that a bump had to be put in to the firewall for a valve cover. Amongst other things. On my Suburban, everything tucked in nicely without modifying any sheet metal. | | |
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