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Re: big block owners WTF?
Couple of ideas for you...Went thru this many years ago when we swapped a 350 out and put a 454 in a 1973 3/4 ton 4 X 4. It would not go more than 20 miles in the AZ heat before it vapor locked...Did everything under the sun...The final thing we did was install a stock fuel pump with a return fitting and a return line back to fuel tank. Problem solved...!
I am not sure what year you are working on but by your avatar it looks like a 69-72 blazer?
If you are using the stock setup then you only have a feed line. Install a new manual fuel pump for a truck w/Big Block and it will have return line.Then run back to tank. You will need to install a fitting somewhere on tank for return.
This will keep the fuel moving and I will pretty much guarantee that your problems will go away.
In my opinion forget about rerouting fuel lines/ice cans/heat shields etc...Been there...done that. Jus a waste of time.
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