I have the same car and have done some research. I think the LT1 swap is pricey and complicated. The path I'm going to take is this.
Keep the L05 engine. Do a factory Vortec head conversion and by 'factory' I mean from GM you can almost by a kit do do this. When you go to get the heads they're going to recommend an intake and a cam. All from GM. YOU CAN NOT USE THE L05 intake on the Vortec heads. SO that swap alone is going to get you somewhere in the range of 100HP or so. GM's claim is that the heads alone give you 50HP
So now you have quite the sleeper. Check your build sheet for the differential gearing. If you car has the tow package then you'll have 3.73's in there. If you're telling me your car is slow that probably not the case. Grab yourself a Detroit Locker with a set of 3.55's or 3.73's and I'm thinking you'll be pretty happy
Make sure the tranny's tight before all of this.
Originally Posted by rivie'sfleet
i got a 93 fleetwood and wanna throw lt1 in and take out stock 350. is it worth the money, or should i just tinker with the stock slo-poke and convert to port fuel injection. any advise is welcome.
I have asked about upgrading an LO5 on Chevy High Performance's website. If you can't afford to do heads yet then the right cam will take care of business.
"This is an excellent opportunity to put some beans into the 350. The version your Caddy has only develops an emasculated 175 horsepower. You really don't need to add more slip with a high stall converter, given the funky ways converters work, you won't see the difference with such a heavy car at the far end of such a gutless engine. You need some torque and ponies injected into the Cad. The route to happiness in this case is more cam, more cam just about anything with bigger lobes than a broomstick is more cam, some heads and if you want to go crazy headers and a cat back exhaust. With a little effort this motor will easily double the output and be smooth, tractable and smog legal.
Depending on whether you live in California or a place that tests to California standards determines some of what you can do. A good cam choice would be a Crane 2030 P/N 104221, this is a hydraulic roller that slips right in it improves timing from what you have at 170/184 with less than .4 inch lift to 204/214 at .429/.452. This stick will add about 80 ft pounds of torque and about 60 horsepower. Then depending on California or not, a set of Vortec heads which require an intake change for bolt pattern will add an easy 40 ft pounds and a like amount of ponies. If in Calif. a set of Edlebrock Performer heads, while more expensive, add the same or a bit more power, use your stock TBI intake and are CARB/50 State legal. So we've moved this turkey from 175 to 275 horeses no sweat with an additional 120 ft pounds. A set of headers and a cat back exhaust could add another 20 to 30 ponies up toward the top end.