EFI SBC vs LS Motor

[Ron Sutton]

Originally Posted by redefined

So far everyone has told me to just go LS.

If your goal is to build 700hp with a supercharger, you can do that pretty easy with a SBC or LS. If you have a SBC that is capable of living & thriving with 700 hp, then that will be a less expensive route.

If you're building from scratch, with a 700 hp goal for each, If you did everything the same, the LS will cost a bit more. The larger additional costs you'll run into is if you're doing a change over & need to change everything in the car.

On a side note ...
700 hp with a blower is an interesting territory for most production engines. You can make factory parts work, but the life is shortened. How much depends on many specifics.

For example, you can use an LS1-7 aluminum block, but they weren't designed for that kind of power & heat, and eventually you'll have issues. But an LSA or LS9 block would work well long term. The same concept applies to cranks, rods, pistons, etc, even more so.