ok so i keep reading that the lower intake manifold is a real problem area on these engines, why is that and is there a known fix for it?
use the forum and search for Justin_gt8, and he can give u the exact details on how to. The lower manifold chokes off power at 5500-6000rpm and when its replaced with a short runner manifold, it extends the power band to 6000-6500rpm before choking off with no loss in low end hp/tq.
Toyota UZ cams are more expensive versus domestic cams because we need 4 cams versus a single cam for domestics. 4 cam for under a grand is a steal for these. The $2000+ cams are billet machined versus Lextreme's re-ground cams that are plenty stong already.
1998 GS400 VVTi Diamond Pearl White. Tein Flex coilovers 16k/12k, OS Giken LSD, Figs Engineering spherical caster arms + 34mm front RCA + MEGA/Toe/Traction arms + rear knuckle sphericals, front/rear end links, TRD sway bars, Serialnine solid subframe mounts, TOMS 6-link kit, TOMS front under brace, Ikeya Formula RUCA's, JIC dry carbon strut tower bar, custom HKS/Burns stainless exhaust, PPE headers.
Soon to be supercharged and intercooled...
1991 LS400 grey supercharged: Retired
1993 SC400 grey supercharged: Retired
1992 LS400 silver: Retired
1995 SC300 green: Retired
1993 LS400 white: Retired