Low battery voltage does all kind of bad things to efi
Injectors can pulse less so less fuel and more lean. If you heard hollow sounding pops and saw the intake flex that is a lean back fire. Rich back fires are fireballs out the tail pipes.
Most likely you blew intake manifold gaskets and...
Cruise trim is this
Trim up till you porpoise then trim down a touch till it stops. The steering will feel lighter as you go to high as well
Trim and max speed are a whole different rodeo
This is a large case 6-71 not a small case. While it’s not a 14-71 it’s not a baby blower.
after watching some videos from Richard holdener, the bigger heads make more power for sure on a 6-71. Also adding cubes jumped the power as well which I was surprised to see.
small volume heads have...