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Don't scream yet :o)
I am really trying to cut-down on my posting and couldn’t find one this in previous posting…

At the repair shop yesterday, I noticed that one of the bug engines original tin is different in that both the left and right bottom engine tin does not leave a 1/4 inch gapping hole between the top and bottom part of the heat exchanger—therefore, no hot air can seep out from the top and bottom side of the heat exchanger cover. Is that good, I mean more efficient movement of out going hot air into one direction?

i don;t know about everyone else but i can't picture what you're talking about. are you talking about the rear tin?

Yes, both rear, bottom engine flat tin, they are is mounted next to the heat exchanger housing tag (with a hole for the holding screw) that hold the tin in place and the other end is screw on to the engine itself.

If you look at it from the side view, you will see a 1/4 inch gap hole between the bottom/top part of the heat exchanger.

It's fine.

Since newer bug have them plugged, is it possible that it could make some difference (more efficient cooling) to cover-up those top/bottom quarter inch gap hole between the heat-exchanger on both side of the engine? I could feel a lot of hot air hitting my legs if I were to stand next to heat-exchanger (beside the tire).

Hope this don’t construe this as another transgression at making an issue out of nothing, because where I live—being hot all year round--185F during traffic jam—anything “stock” that improve the bug engine air circulation to cool it does help )

It's fine.