1991 351w/E4OD/3" lift/4.56/33" tires/LSD FR+RR
Over time I've taken the measures below to give my '91 351 more power. All of which gave me significant power gains:
- Advanced 12 degrees (make sure plugs and cap are newish and all firing)
- Replaced clogged catalytic converter (this made a huge difference)
- The gas peddle was actually bottoming out on the floor mat.. which didn't allow wide open throttle. Throttle cable is too long. I wonder how many owners are having this issue and don't even know it.
- 4.56 gears with my 33" tires. While 3.55 with 33" and 302 is not a good combination for power, you should be able to get up to highway speeds fine. 4.10 or 4.56 gears would definitely make a difference but only done last on the list when all other power robbing items have been addressed.