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Posted by: simonjb Feb 25 2018, 01:28 PM

Can someone tell me what goes in/through the rectangle you see here in the engine tin??

Posted by: McMark Feb 25 2018, 01:32 PM

Intake air pre-heater plumbing passed through that spot. Only present on early cars (70-71)

Posted by: rdauenhauer Feb 25 2018, 01:37 PM

in conjunction with the oil bath air filter

Posted by: Spoke Feb 25 2018, 01:57 PM

If the hole isn't blocked off it should be to stop the cooling air from escaping to the engine compartment instead of going past the cylinders.

Posted by: McMark Feb 25 2018, 04:25 PM

This hole doesn't enter the cooling air section of the tin. It just passes from the bottom to the top. So, plugging it will stop hot air from travelling up from underneath, but I'd hardly be concerned with that amount of air. Leaving it open shouldn't affect anything.

Posted by: r_towle Feb 25 2018, 05:04 PM

Considering it’s right above the exhaust system, I would close it off so you don’t suck hot air from below. The rubber seal around the engine tin is not for looks, it has an engineered purpose.

Posted by: mgphoto Feb 26 2018, 12:19 PM

This preheater is also on MY '72 goes away with the paper air cleaner MY '73.