It was honestly a tough job to fit it in. We wanted to keep boosted brakes, AC, even cruise control, so to do that we had to get rid of the vacuum boost on the firewall and make a remote mounted hydo boost behind the front left headlight with a linkage system that runs up there to activate it. That was actually a ton of work. There were just so many packaging things
- Had to notch the oil pan to fit over the steering rack
- Had to get rid of the brake away joints in the steering shaft and make a solid one
- I welded our full custom dual 2.5 inch exhaust. It has to go OVER the transmission mount on one side for ground clearance.
- We used 2 different headers in order to accommodate the steering shaft u-joints
- Hammered out the transmission tunnel
- Custom driveshaft and differential flange (to answer your question, we're currently using the stock diff. It is a limited slip and they used the same one all the way up through the 5 series line of the era so it's *supposedly* rated to 450hp. We're at about 350 so we're hoping it hangs in there.
- Made custom intake from fiberglass in order to clear the pulleys and stay under the hood
- Radiator and mounting was a hassle
- Obviously we made our own motor mounts and transmission mount
- Wiring actually wasn't that bad. We used the stock harness and sent it to a guy for modifications.
- I'm forgetting a ton cuz i'm tired but yeah...it was definitely a big project.
Regarding mileage - that engine actually is pretty economical as long as you can make yourself drive with a light foot. Most of the time I'm practically idling. In 6th gear on the highway (60) it's doing 1300 rpm. Then if you floor it in any gear through 3rd you just loose traction. I can downshift to 3rd on the highway and start drifting haha... (I know ...retarded). So yeah it was worth it. Definitely go the LS1 route for your S10. The LS1 actually has 2 locations for the motor mounts to bolt in (so that the classic hot rodders could directly bolt them into 69 camaro's, etc. Pretty awesome really), so it's pretty likely that it's a near direct bolt in.