Originally Posted by daoldbuick
My current setup has a 7" power brake booster under the floor boards. My concern is the exhaust pipe is between 1/8 and 1/4 inch away. This is about 3 feet back from the header flange. Is this to close and if so what is the minimum distance I should have? The exhaust is dual 2.5 " and I'm thinking just cave in the pipe a half inch or so at the point where it's close. Either that or get some header tape and wrap around at that spot. Motor is a 350 horse 350. Thanks
First, you'd like to know what the heat is at the point where the two are closest to one another. Both the heat off the pipe and how much of that heat is radiating to the booster.
If rerouting the exhaust isn't possible, I believe you'd want to get more clearance between the two than now exists, but preferably w/o denting the pipe unless its diameter is large enough that this will not create any notable backpressure.
Once you've done that and gotten an idea of how much heat is involved, I would use a radiant heat barrier between the two that is rated for the temps you are dealing with.
There are several companies who deal in this type of product. HP
is one of them, Thermo-Tek, Moroso has p/n 80805 "Heat Barrier Blanket", etc.