If you were to spend $5k and do everything I said (which when I was talking about the machine shop work, I only mentioned a few things, there are alot of other things to do) the car will be in the 14's, not low 15's....Sorry to tell you but with those mods you would be in the LOW 15's not 14's. It takes a lot of power to have a second and a half gain. You think it is soo easy! I have been there, spent the money, been disapointed with results. Yes it was on a Camaro, but a car is a car!
Plus, you will get better RESULTS making a stock 15-16second car quicker then a stock 13 second car quicker... IOW, like almost any hobby (including home audio gear, my other past time) is, at first you spend a little to get alot, but once you get to a certain point, you spend alot to get a little... but that is what seperates 1 person from the crowd.... IE... it is CHEAPER to get, say a Mazda Miata or an Acura Integra or similar small import to shave UP TO 2 seoncds off their 1/4 time then a Camaro.... NOT that it will be FASTER... A Miata is what? like 17 second car stock? do an engine swap and a few other things, and you can get it to run a flat 15.... 2 seconds off the 1/4 time... to get a stock Camaro, which you claim is a low 13second car to run a low 11second time (2 seconds off the 1/4 time) will take ALOT more money then getting a Miata to go from 17s to 15s.... again, not which is FASTER, but how much it costs to get similar benefits....
Again, that is not the only thing I said would be done... you could get a custom cam ground, and as well as other things.... Obviously you are not gonna go to Jegs and just pick up these parts, but in the hands of someone that knows what they are doing, you can get creative and start modding things on the engine like the TB, manifolds etc... to get them to flow better.Porting and polishing your heads isn't going to do much but waste your money if you don't get a cam/intake/headers to get the extra airflow in and out. You can port and polish your heads till the cows come home but if you want to see a difference you're going to need everything else to accomidate it before it would actually be beneficial. I can only imagine how restrictive those exhaust manifolds are. Actually, if you were to do it, the proper thing to do is get a cam and then work the heads around the cam.
I don't know about your car, but my car has the 4T60E.... my father has a '99 GTP (one of his many cars) it is pretty much stock, just has the smaller s/c pully, and added a factory strut bar (GM put them on the Regals, but kindly forgot them on the GP) He was getting a noise form the tranny, so he dropped the whole cradle, and took the tranny to his friends shop and had a total rebuild... his tranny is the 4T65E... pretty much the same as the [4T60E] in my DeVille.... he had the tranny rebuilt, beefed up, and had a shift kit installed..... before the rebuild, when the car was NOT in performance shift, it would kick the RPM's back before shifting, and kinda flow into gear, you wouldn't really feel the shift (like my DeVille)... when performance shift was ON (increase in line pressure) it would shift more firm.... what happens with my DeVille and the GP in normal shift, is that the clutch plates come together too slow, and since they are turning when they are coming together, there is unwanted slipping, which also will wear out the tranny faster.... today we were talking about that and then we rode in his car and he showed me, it isn't banging gears (like his Fiero with the shift kit does) but just shifts into gear alot more firm (when not in performance shift) <--- My DeVille is like that from the factory, so that the target 65+y/o buyers woudln't get whiplash from shifting gears, and it would last a good deal beyond the factory warrantee, so GM woudln't be loosing any money on it....You also don't need a shift kit on your Caddy. I had my tranny re-programmed with a program called LS1 Edit for Camaros/TA's and Vettes. You can totally adjust the firmness of the shifts, when it shifts, etc. I'm sure you can probably get something like this done. My trans shifted so hard after the settings were changed I could burn out when it shifted into 2nd gear, worse than if it were a M6.
The tranny in my DeVille is electronically controlled as well, when you run it wide pen, it does shift alot more firm then part throttle, but still not really firm.... a reprogram chip or anything like that can only increase line pressure... but you can only increase the pressure so much.... is is the physical part of the tranny, and how the clutch plates actually slip from the factory like that.... If I can get the shift kit and a fluid/ filter change for $150 or so, I will probably do it, the car really take a long time to shift... again designed for the target audience, and I think the shift kit would improve it alot.
what I meant by "Now you are gonna be like, "hahahahaha, $5k to get your Cadillac to run a low 14 in the 1/4 my Camaro runs that stock" was supposed to mean, it is faster then it stock... I didn't think I really had to explain that too much....Oh, and LS1 Camaro's don't run low 14's stock, they run low 13's.
high 12's, low 12's whatever, the fact is, it is using a Cadillac engine, in a big body, full size, 4600lbs car (IE: NOT stripped out at all) while still retaining a completly factory slook... it is the mother of all sleepers.... something that I dream of owning some day (right beside my '56 Coupe DeVille and '59 Eldorado drop top)That guy with the hot rodded Caddy runs High 12's not Low 12's, plus he has never even been to the track so his estimates with the G-tech might be false. He is also a different story than you! A 500CI engine is no laughing matter, you can make that into a monster, something you cannot do with a 4.9. Plus (I may be wrong) but I'm sure there are tons of performance parts out there for the 500CI that are also used in other big blocks. If I'm not mistaken lot of the older stuff was universal. Also, the car is RWD which helps out greatly in the traction department.
Anyway, the Cad 500 does have after market parts (500cid.com) and AFAIK other parts form other engines are not interchangable... but the 472/500 does have a nice following... yeah there is the whole FWD/RWD thing.... in a 16, 15, even 14 second car, it really dosn't come into play.... there is a 9second FWD car.... what is your point? my fathers Grand Prix is a high 14second car stock, and even lightly modified can be in the 13's (don't believe me? there is a MASSIVE following on those cars) and they are all FWD.... don't get me wrong, if all else was equal, I woudl take RWD over FWD, but saying 1 car is simply better becuase it is RWD isn't saying much....
Also, it isn't the fact that the 500 actually has an aftermarket, or the car is RWD, or is is a classic or blah.... but that it is a Cadillac with a Cadillac engine... and in a previous post of yours you said something along the lines of "modding A Cadillac is stupid and pointless, and you can't get A Cadillac engine to run a 12second 1/4) That just disproved your point....
Yes, weight does play a big role in it... much of the reason why little imports that make high hp but really low tourqe (NSX xomes to mind) are very fast... weight.... but just how much fun is a car if the whole interrior is gutted, all the seats but the drivers seat is removed, truck has nothing in it, you have to call a tow truck if you get a flat somewhere because you don't carry your spare tire etc.... the fact that you can say your car is running a 12second 1/4 mile time, and NOT gutted, still 4600lbs, completle interrior, big seats etc... means alot more then having essentally a powerful enigne on 4 wheels with an enclosed body, and nothing more....But again, because of the weight it's slowing him down. My buddy has a 70 Chevelle which he just put a 502 in. He's making 750HP naturally aspirated and 1000HP on spray. He should be in the high 9's.