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Originally Posted by abcdefg My cadillacs 1977 425 is a gutless wonder. Im amazed at how i "cruise" up hills in this thing. With the gas pedal about 3/4 on the floor (in 2nd gear going 20mph) it barely holds its speed, and this is a fairly new engine.
When i put it in Low and "floor it" its pretty good untill about 25-30 then its like im towing a school bus behind me, it accelerates faster in 2nd after that than it does in 1st. I busted out my cadillacs service manual, and looking at a cutaway view doesnt give me a suprise as to why this engine is neutered on the top end.
The intake manifold looks like a snake, you can even see the tight bends just by popping your hood.
I do have a muffler and exhaust tip off a 12 liter kennworth diesel, but i think the caddy would drag bottom with either thing. Plus i dont want it to look like a "ricer" (5" 4.5 foot long chromed pipe hanging out)
The easiest route to go would have been to buy that 500 cid on ebay. It had a blower, 8 port nitrous fogger, heavy duty performace connecting rods pistons and all, hot valve cam... but i dont want to blow up my THM400...
Is the 425 cid really this wimpy?
If im lucky enough to find a 425cid or 500cid caddy with fuel injection, and figured out how to hotwire it into my carbureted wiring, would this give it more balls at the top end (past 2000rpm)? I see the fuel injected deville is rated at 190hp, versus the carbureted 180hp. I suppose a die grinder and carefull planning would give the fuel injected manifold more oomph? |
start with little things first the 425 isn't really that bad just needs a little help breathing. make th eintake and exhaust flow. things like a hotter coil and ignition advance kit for the dizzy good plugs and wires. small things like this will really liven it up. cad motors arent a high revving motor like chevys or fords. Cads are a torque motor you may only have 190 horse but the torque more than makes up for it.
how your tranny doing? color and smell of fluid, when was it changed. its hard to blow a trubo 400 but you may be