Lextreme II
Just call me "Lex"
- Messages
- 12,033
- Location
- City of Halos
I was talking to JBrady few days ago. I have asked him about the 1uz vs. 3uz differences. Besides the heads, intake and cams (heads and up). The 3uz block is basically the same as the 1uz block with slightly larger bore. Due to the increase bore side on the 3uz (91.0 mm x 82.5mm), the cylinder sleeves are thinner than the 1uz (87.5 mm x 82.5mm). Only 3.5 mm bore difference between the two motors. However, this also means the 3uz motor has 3.5mm less on the cylinder sleeves. From that prespective, the 1uz is actually be for high boost application. Here is a 1990 LS400 1UZ spec.