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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?