Thanks for the comments KartRacer47. I find no reason to leave any questionable metal in the body tub. This is intended to be a once and done project with no further rust repairs later on.
I’m back to work on the GT.
The firewall is a double wall construction in some areas. The flanged, spot welded areas were not conducive to my plan for cleaning up that area. I cut thru the engine side to give plenty of clearance to work with. This hole will be eventually covered by a bolt-in panel. Then I cut the inside wall a bit smaller than the other to fit the A/C evaporator forward an inch or two to clear the cross brace, temporarily removed. I had to cut clearance for the blower motor on the passenger side. This area intrudes on the original cavity made for the hood (bonnet) hinge. It needed to be closed up in order to prevent engine fumes from entering the cabin. A little fidgety fabrication (2 days!), and viola, I now have clearance and a closed hinge cavity. By moving the A/C forward, I should have some clearance between the A/C evaporator unit and the back side of the dash for some future gauges, switches, etc.
This installation will remove my intended plan to retain some sort of fresh air thru the OEM ventilation paths, while replacing the heater with the heater - A/C system. It should improve the Heater part as it is heating recycled cabin air and not fresh air. Oh well. If it must be, so it shall be. Maybe I’ll have an epiphany later on and find a way to bring fresh air into the foot wells.
In the A/C’s planned location, I will be able to reinstall the square cross tube and still be capable of removing the assembly for future service if necessary. A little move rearward, a slight tilt and it can be lowered and removed. The radio console. Center support that is welded to that tube may need some modification/relocation. I may possibly make it removable. We’ll have to see as more things are fit.
On another front, I decided to purchase a customized installation kit for putting the 3.4L Camaro engine into an MGB. I could have built it myself. My previous Locost build gave me confidence in being able to build that part, but decided to focus my efforts on what I could not purchase. The installation instructions require some bolt clearance on the top of the transmission. This was pre-accomplished when I removed the heater shelf. It also required some clearance on the driver’s side tunnel / foot well edge to clear the exhaust header mounting bolts. The installation instructions said to simply beat the metal into the required clearance. I decided to just cut the sheet metal and fabricate a piece for that clearance.
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engine side firewall.jpg
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cabin firewall.jpg
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AC 4.jpg
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Chuck.
“Any suspension will work if you don’t let it.” - Colin Chapman
Visit my ongoing MGB Rustoration log:
over HEREOr my Wankel powered Locost log :
over HEREAnd don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766