1984 C10 BBC 427 feels like its lacking in its true performance abilities.

[yellow400ex05]

I've got a 1984 Chevy C10 with a rebuilt 427 1966 block with 68+ heads not sure what year.


just put a new 780CFM quick fuel carburetor on it new 8mm spark plug wires, it actually had 7mm wires on an HEI ignition and you cant even buy 7mm wires with HEI for these anymore, and fresh plugs. Also has a Comp Cam Magnum 282 cam in it, .561 lift unknown if any other modifications, but the front casting pad is blank like its been cut so that's why i believe its been rebuilt. uses a 4 quart pan as well so i believe its out of a passenger car.

its got a TH400 trans, that so far i've been unimpressed with it has no kick down button in the truck due to the fact that it didnt come with a TH400 but a 700R4 originally. Yes I realize I need one

but regardless the truck chirps 1st through 3rd gears fairly easily, but seems to shift too soon it'll roast them off in 1st but it seems sluggish after it shifts and takes forever to wind out 2nd gear and 3rd gear FORGET it, total slug.

could my Factory 3.08 gears and no kick down really be making this truck a bit more lackluster than I'm expecting it to be? also you can feel that before it shifts at about 3000-3500RPMs it starts to pull like a freight train, you can feel the power come on strong then WHAM it shifts, and back to a lugging lackluster engine.