Headers depend on the motor size, and the vehicle, as they have to fit the chassis, as well. Hooker, Doug Thorley, Blackjack, Headman, are some of your companies. Contact them.
The 1994 Chevy 454 cubic inch big block engine temperature sensor is located on the front of the engine. The engine temperature sensor will be a few inches above the thermostat housing.
The 400 Chevy is a small block engine. The 400 BIG BLOCK Chevy does not exist! 402 big block Chevy does. it seems in the early 70s Chevy put 402s in their pick ups and they had 400 badges. this opened the can of worms known as the non-existant big block 400.
Yes.
yes
Chevy actually made a C1500 with a 454 stock in the 90's, so yes.
1,8,4,3,6,5,7,2 all small block and big block firing patterns are 1,8,4,3,6,5,7,2 for Chevy
Chevy to Chevy...yes.
It is a small block
no
Yes it can, you will also need the big block pickup tube
It is a small block.
no