I am highly considering making my lightweight 68 impala, to be powered by a compound 4g63.
This has been a thought for a while but now I'm about to pull the trigger.
My only concerne is if the engine will have enough torque. As it will become a high hp DD.
I still own the 327 that came in the car. Along with a 2 speed powerglide.
I do not want carb anything. I have been doing extensive research into TT sbc's.
The problem is i cannot buy individual parts that aren't ebay crap that won't last.
Wrenchrat and nelson racing have some really awsome parts but only as kits, and i want to piece the baby together how i choose.
Everyone says the impalas are heavy cars... you remove the engine and thats 610lbs right their. It wasn't easy but I've picked my 4g63 engine up by myself to load into a truck, so it couldn't have been more than 270lbs entire engine. so I'd save 340lbs on engine weight. which would make only a 295lb difference between the two cars. They also make fiberglass everything for this car, hood, fenders doors, etc.
The amount of room under the hood would be great and easy to work with, it would stay auto RWD and possibly get a really short geared 700r4 transmission with a high OD for interstate usage.
My position is: I have a GSX that has everything I need. wireing ecu ecmlink. Fully built 9:5:1 compression, All I would need is a larger HX40 to compound my tdo620g, another external wastegate and a second fuel pump and larger injectors/along with meth injection. All fabrication would just take time.
Lightweight wheels and driveshaft, and buschur adapter plate. Possibly a billet converter to save on rotational mass.
That stuff aside I have a great gsx with a fubar'd awd AT. I'm at the point I want my 68 for looks, and the 4g63 CT, for power.
It seems to be a reasonable feat. And man I've been kicking it around for over a year.. I could care less about keeping an old car original, it's just not me.
This may become a failure, or it could possibly be one of those that everyone remembers that went down in the books.
I'm ready for either fate and won't be satisfied until I find out.
Thanks for the link, this is my model, 3,904 lbs 1968 Chevrolet Impala Sport Coupe 327 V-8 Turbo-Fire 275-hp Powerglide
98 gsx hatch 3,269lb with stock 210hp.lol So the wieghts might not be so far off in the end.
The body of the car won't change much, although the stance will be low.
After talking with a friend who is a GM engineer today, it seems as though A sequential turbo setup might be more benifitial to this build. A small 16g- to a hx40. That way from low rpm around 3,000 I have upwards to 300hp and270lbs of torque, to get things moving, and then swap over to the hx40 around 5500-6000 rpms so i can have the most top end power hopefully in the 600 range, While still having a great drive and dependability and pretty good gas miliage out of boost.
I know alot will depend on my rear end's gearing along with the transmissions gearing.
I will have less money in this swap, because it's just going to take time, I have that. I dont feel like spending more time learning how to tune a new system, or converting carb to FI, fighting for room under the hood for a TTv8, etc.
I'm selling the 327 block, this is going to happen, the 68 impala, will be 4g63t by summer.