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Reply to "Shaping 550 Fenders..."

@dlearl476 wrote- "There's a lot of controversy about these. IIRC, these were made to help cool the cylinder/heads in a type 3 due to the limited nature of airflow in the fastback/square back engine compartment. At some point in the Samba thread, someone posted a VW TSB that said they shouldn't be used on a type 1 engine. Like a lot of folks in the thread, I wonder why, seems like a good idea to me. Off the top of my head, I can't think of a reason the wouldn't work on a Spyder, lower pan or not. Maybe someone with some more experience than I can offer some insight. I'm debating installing some if I ever have my engine apart."

Remember that the cooling air in a type 3 moves horizontally so different ducting is needed.  The type 3 lower tins aren't as useful (as built) on a type 1 because the air moves vertically.  There are guys that have made the type 3 tins work (with substantial modifications) on a type 1, but it's usually out of necessity- the regular sled tins not working because of the design of the header so they're cobbling something together to cover at least some of the lower cylinder fin area.

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