LS3 Interference with AC / Heater box.

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Dec 4, 2020 | 09:36 PM

cagotzmann

Thread Starter

Melting Slicks

Joined: Jun 2011

Posts: 3,116

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LS3 Interference with AC / Heater box.

Can someone confirm to deny if the LS3 engine will have a problem clearing the AC / heater box in a C3 corvette. Mine is a 1978 car. But not sure if anything will hit the passenger side AC / Heater box ?

Thinking the coil pack might need to be relocated.

Dec 4, 2020 | 10:05 PM

73ls1

Pro

Joined: Nov 2004

Posts: 668

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From: Bismarck IL.

I used the factory ac and heater with my LS1 no problems .The engine was about 2 inches from the firewall .I went with Vintage Air and set the engine about 1 inch. Charlie

Dec 4, 2020 | 10:55 PM

nyciti

Burning Brakes

Joined: Aug 2016

Posts: 1,000

Likes: 283

From: New York

Ehhh...depends on engine mounts. Ls3 coils are not flat so it may hit, I've seen it go either way.. 50/50...

Dec 5, 2020 | 10:46 PM

bluegtp

Drifting

Joined: Nov 2004

Posts: 1,630

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2020 C3 of the Year Finalist - Modified

I've seen some ls installs with the factory ac/heater core box on the fire wall. Looked a bit tight but manageable.

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