It’s actually a small block novarossi 2.5 the truck is super lightweight. It started life as an Lst2 but I went back to Lst 1 arms, axles and such . As far as the main chassis plate I bought a 3 mm piece of carbon fiber and pretty much just traced and cut out the original chassis except for the center of course . Then had a cardboard chassis mocked up to fit and test trans spacing . Once I had it right I traced it to the carbon fiber and cut it . Here was the fun part. The rear center transmission driveline is stock . I had to order a few different drive lines and finally found a steel revo 2.5 front center shaft , best of all it fit the stock differential yoke . The top plates are Losi cf plates . The hinge pins and turnbuckles are Lunsford titanium . Those actually shed a noticeable amount of weight . The hinge pin braces are hardcore racing titanium, those themselves were super hard to find. I wanted a beefy yet lightweight shock so I tried yeti xl shocks and boom! Perfect fit . I’d gotten the idea because guys in the axial yeti forum were actually putting Lst shocks on their xl’s . I originally had muggy towers and standoffs with Losi 8ight t 3.0 rear shocks all the way around but the muggy tower would not let me access the roto start on the engine so I went this route. The only thing is the transmission sits lower than stock so I’m planning on cutting some carbon fiber spacers to lower the center skid plate . I’ll I have left to do is mount the throttle brake servo and receiver pack which I have the receive both of those in carbon fiber as well the receive pack will sit under the exhaust pipe but I will be installing a heat shield to protect the battery . I originally years back built an Lst with a Losi 3.4 and it was lightweight and ripped too! I used to be big into off-road monster truck racing which was pretty much monster trucks running on the truggy track and I raced no limit style as well . I loved the Lst line but guys racing the Revo’s always said it was unfair because I was running a big block so I said “ I’ll show you!!!!” Took me about a week or so and I showed up to the track with the same Lst but with cf chassis plates all the way around Lunsford titanium kit and the Losi 3.4 installed. It weighed it at just over 9lbs which was lighter than the revo platinum. I didn’t want to go too light because the truck wouldn’t stay planted. Man did they laugh when I set it down on the track . But by the time the race was over it was pretty quiet in the stands . I wasn’t the best driver and got 3rd on my first race but the Revo’s really had to push themselves to keep up . We all know the Lst is a very tough truck and paired with an underpowered engine , I never broke anything!!!! Just bumper mounts . I’ll post some pictures and a running vid of that bad boy soon.