Red Headed Stepchild-75 Swinger LSX Swap

inkjunkie said

Don't need a whole lot in the way of internal tweaking to support boost on an LS. View attachment 1715080023
Friends with this guy. Wrecking yard 5.3. Took the block apart to loosen the factory rings. Reused the "one use" rod bolts. ARP head studs. Think he said he has a BTR turbo cam. Stock 243 heads with BTR springs. Holley Tall Ram intake with a Holley Dominator EFI. Air to water intercooler. E85...View attachment 1715080024
Time slip was on a almost 0 prepped track in 90+* weather.

Click to expand...

I spoke with a friend Danny who is running a turbo 400 behind a turbo LSX in his 69 valiant and he said as long as you tap up the seam at the fire wall it'll fit no issues. The turbo 400 I have right now is a core from my dad that he is letting me borrow for mock up purposes to test the theory that itll fit without cutting, and only a little massaging(if not then i'll "shift gears", sorry had to say that, and figure out my next option for transmissions. But should that be the case then maybe a turbo 350, with its smaller size but almost equal power handling capabilities would be next on the list.
Im using this as a reference right now for trans dimensions.
Transmission Dimensions - TCI® Auto

The 4L80E is a massive trans, a little bit longer and thicker than a 400. But I am going to try to have the 904 and slant out tonight and at least a test fit of the LS and TH400 tonight so I can get an idea of how the motor mounts are going to need to be welded together. I can also test fit the turbo manifolds and check for clearance issues. I've seen a ton of 500-600 whp stock bottom end LS motors on 14psi or less with the right sized turbo, and my 78mm should be plenty big enough. I haven't decided on e85 or not, I like to cruise a lot and don't want to stress of fuel system after letting the car sit from my many military travel trips. So most likely I will stick with gas.