Can someone tell me what goes in/through the rectangle you see here in the engine tin??
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Full Version: Whats this rectangle hole for?
Intake air pre-heater plumbing passed through that spot. Only present on early cars (70-71)
in conjunction with the oil bath air filter
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.
QUOTE(Spoke @ Feb 25 2018, 02:57 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.
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.
QUOTE(McMark @ Feb 25 2018, 05:25 PM)
QUOTE(Spoke @ Feb 25 2018, 02:57 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.
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.
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.
This preheater is also on MY '72 goes away with the paper air cleaner MY '73.
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