Top heat shield only on 355 passenger header?

The alternator and flexible oil lines that run under the header are the most vulnerable things there. The oil tank is just a metal box.

 

OK so you currently have a full shield (top/bottom) on the passenger side and no shield on the driver side and no ceramic coating on the headers.
If you only have a half (top) shield on the passenger side, as noted above, you will not only expose the alternator & oil lines but also the motor mounts and the lower portion of the oil tank. Plus with no shield on the drivers side you are exposing the a/c compressor, lines and motor mounts as well. You need lower shields on both sides. Have a look at the Fabspeed site and their shields....they are easy to fabricate. As well you could fabricate metal shields over the motor mounts.

 

another option is to use only the fabspeed shields but to ceramic coat the headers with the heaviest ceramic coating you can get for added protection. most ceramic coat their unshielded headers.

 

heres a link to fabspeed:

https://www.fabspeed.com/ferrari_F458.html

and goto Ferrari F355 Sport Headers

 

another option to protect the oil lines is thermal thermal wrap:

Dei 010477 Fire Wrap 3000 Hose Wire Heat Protection 5 8" I D x 26" Long | eBay

There are many options and you can mix/match what you need for your application.

 

the fabspeed header blankets are certainly an excellent option but very expensive.

what I was suggesting was the 2 square stainless metal heat shields in the pics with the fabspeed 355 headers....they go in front of the a/c compressor and the alternator.
they are easily made from autobody heavy grade sheet metal and painted with ceramic paint for rust protection.

with regard to the motor mounts....cut 2 squares of sheet metal...say 6 inches x 4 inches....drill a hole roughly in the middle ...remove the nut holding the motor mounts and place over the motor mounts..reinstall the nut . once installed you can bend down the heat shield around the motor mount to protect it from header radiant heat. you may have to take it off a few times to hit it with a hammer to get the right shape. I also painted it with ceramic paint to protect it from corrosion.