Quote:

Anyways, will a '77-'79 Sedan deVille run a quicker 1/4 mile than a '75-'76 deVille? I think so. I think it's like 17.5 or so for the 425 and like 18.1 for the 500.
From: www.100megsfree4.com/cadillac/cad1970/cad77.htm (hope they don't screw up this link like cadillacowners.com did...) <- edit: yeah, they censored me. WTF? #$%^ pinkos...

(1977 Cadillacs were) \"an average of 950 pounds lighter than their massive predecessors\"...

The rule of thumb in drag racing is that for every 100# you drop, you should go 0.1 second faster. So, they drop 950# but at the same time lose 75ci and only go 0.6 seconds faster through the quarter, not 0.95 sec.

Still too many variables to compare the two and draw many useful conclusions - you can't compare different engines in different chassis and draw any conclusions except that a stock '77 Caddy was faster than a stock '76 Caddy.

Let's run a stock '77 against another '77 with a stock '76 500ci motor swapped in before drawing any conclusions. I know where I'm putting my money... But, hey, maybe we're wrong about this whole displacement thing and all the stroker kits and big engine swaps and etc out there are just a scam...

My '79, all stock with 88k or so ran a 17.5s @ 78mph.... this dosn't reflect when new, this relfects as she was at the time. After that I did some minor performance mods which really opened it up nicely.

I still think the '77-'79 will be faster.... the extra displacement of the 500 isn't enough to warrant the extra 1,000lbs.... power output was similar.... keep in mind, the 500 was bogged down with more emmissions then the 425.... 425 never had an AIR pump etc...

the 500 has the gears, but the 425 has the weight on its side....

Lets see here...the 1976 4BBL 500 was 190hp & 360 lb/ft, but that was probably underrated. The 1976 Fleetwood Brougham was 5213 lbs dry.

In a 1975 issue of Motor Trend, they tested a '75 Eldorado Coupe with the 4BBL 500 and got a 0-60 of 10.9, and a 1/4 mile of 17.60@ 78.1 MPH, so maybe the 425 isn't that much quicker

The 1977-79 425 4BBL was 180hp and 325 lb/ft. I'm not sure how underrated that is, if at all. The 1979 Fleetwood Brougham was 4250 lbs dry.

I wonder what a '77-78 Eldo is capable of...

noooooooo don't start the numbers thing again......

I am the Rain Man!

A.I.R. pumps used very little horsepower. Some 425s did have them.
Dunno about Fleetwood. '76 CDV weighed in at 5075 Lbs at raceway park right after I ran 16.4. Car was all original except for a gutted cat. I raced a guy with another '76 CDV on the 3rd run. His ran 16.01 with a posi limo rear, cool can and some ignition work.
Gears can make quite a difference.
A 500 in the '77 makes for a nicely powered vehicle.
I put one together in October of 1987.
Got another in October '88.
Put the entire stem to stern drivetrain from the first '77 (including the 500) into a 1983 CDV back in 1993. Best car I ever had.