hi just got done painting my firewall and want to put my heater box back on and was wandering what kind of sealant or caulk to use for installing the heater box? thanks bob

Use strip caulking, lots of places have it.

vetrd
If you are looking for "correct" GroundUp & other suppliers have kits. If you are looking for what "works" I got some 3M Strip Caulk from a body shop supply house. It was about $10.00 for a box that will go a long way.

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Rick
72 El Camino (http://members.home.net/jimmy4/rick1972elky.html)
TPI350/700r4
TC#00038
ACES#00140

I used the kit from Ground Up. It costs more but it comes with a seal for the motor the flappers. The fit was pretty good also.

Mike Sibbitt
66 396 SS

Sounds like the kit GU has is pretty good and kinda pricey too. When I removed my heaterbox, I saw no evidence of a gasket of any kind between the firewall and box. All that was there was some sort of white colored sealant. Was the gasket kit that GU supplies truly correct by Chevrolet concerning the placement of the heater box? Curious???

I have disassembled seven 1968 chevelles and three 1969 chevelles down to the frame, and none of them had any gaskets. The heater box assembly fit over the firewall insulation pad and caulk was used between the heater box cover and firewall (engine side) It was also used between the blower motor and cover. The 68 assembly manual also shows this to be true.
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Leo
68SS
TC# 499

I dont know what "correct" seal they have, but from my experience all there is is a grey sealer. There was no gasket, no sealer on the blower motor either. The strip caulk works fine. Never had a judge tell me sealer is wrong that you cant see.

I've also never seen a gasket there, only caulk, and I've done a few heater core swaps with the original Harrison unit still in place.

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Rainer Seitz
Vancouver, WA
Team Chevelle Gold #50
ACES #3784

'68 SS396
'70 LS3 400 Malibu
'70 Malibu convertible 350/300hp
rseitz@chevelles.com

I used plumber's putty on the last two and it works great although I just ordered the GU kit for this winter's project just to see what the heck it contained (haven't opened the box yet!). Like Micky I don't particularly care if either is correct since it can't be seen.

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Stan Hanek
'71 SS - 454 4 sp.
http://www.chevelles.com/showroom/stan71delivery.jpg

I recently did my '69. There was no firewall insulation when I go the car but now that I'm doing things right, the insulation goes between the inside box and the fire wall. On the engine side, I used 3M adhesive foam weather stripping for between the box and the firewall. It is plenty flexible for getting around those corners. I didn't have to remove the blower motor from the housing but it looks like caulking was used by the factory.

Bob

Your talking about the firewall pad on the inside. The seal on the box side (engine compt.)was the part in question.