327_TPI_77_Maro

iTrader: (8)

Hi guys, can anyone tell me what the HP rating of a 307 4bbl from a 1984 Buick LeSabre would be? How does that compare to an LG4 4bbl Chevy? The only reason I am curious is because I am using a 307 Qjet on an LG4 setup and I'm curious if the engines were rated similarly in the HP department.

Sonix

iTrader: (1)

I think they were very close. I use a q-jet from an '84 caprice I think, on my car.
Just check your main jets and rods.. (is this also a cc-qjet?)

Fast355

iTrader: (2)

The olds 307 is like 140 HP/255 ft/lbs for the Y vin and 180/255 for the 9 vin.

99Hawk120

AFAIK, the 9 VIN was only found in the Olds Cutlass 442. If you got the carb from a Buick, it's almost certainly the Y VIN.

327_TPI_77_Maro

iTrader: (8)

It's a Y vin

Fast355

iTrader: (2)

I know that he said it is a Y Vin and not to get off topic, but thats not exactly correct. Vehicles with the tow package got the 9 Vin as well. I had a Cadillac with the 9 Vin 307, 2004r and 3.42:1 gears with a factory trailer hitch on it(Grandpa liked to go fishing). I also have a Y vin 307, 2004R, with 2.53 gears in a similar vintage Cadillac (1988). The 9 Vin had remarkeably better low-speed acceleration, but the Y Vin would get better much better mileage (27 highway).

327_TPI_77_Maro

iTrader: (8)

Ok I don't really need 307 history, thanks though. The 307 was one of those motors that was awful no matter what trim it was in. I was just curious how much more it sucked than the already awful LG4 305 so I had some indication of whether the carbs would be similar.

Fast355

iTrader: (2)

I know, but I hate when something is posted as fact, when it is not. The 307may suck, but the 9 would rip a LG4, both being stock. The Y-vin carb was typically setup VERY lean to correspond with the swirl port heads on the 307 (don't remember if they were using them in 1984 or not).

327_TPI_77_Maro

iTrader: (8)

Fast, thanks! That's actually very good info. I didn't realize the 307 had the awful swirly heads. The carb is really really lean, I am going to have to get the LG4 carb.