I just bought a 2001 Z28 with 64k on the odometer and have the after purchase worries....
Describing engine sounds is pretty hard but this is what I'm hearing from this aluminum engine as opposed to my LT1s. I've placed a stethoscope on the valve covers, intake, heads, block and oil pan but can't detect what I hear and feel while driving.
Cold start, the engine has 'almost' a diesel rattle; its not loud or pronounced but to my ears, it's clearly there. When warmed a little the engine sounds okay until 2k rpm where there's a performance sounding intake rap. Hot, the engine sounds pretty normal at all rpm but there's a light pulse during acceleration that can be felt and heard. All hp engines that I've encountered have this once per revolution pronounced pulse in the exhaust note, otherwise they would sound like sewing machines but with this engine I can actually feel it in the shifter and steering wheel. It's slight but another non camaro gear head noticed it as well.
The intake rap I mentioned beginning at 2k rpm is reminiscent of a 92 3.8L ford engine I once owned. The crank bearings were shot. I'm having a hard time believing the bearings are gone on this engine because hot idle oil pressure reads 45 - 50 psi according to the gauge. Besides that, the ford's engine noise worsened at higher engine temperature. This LS1 gets quieter. I've gone to redline a couple times and all seemed well.
I'm worried that the dealership may have been running 87 octane for the three months they had it on their lot because when they went to fill the tank after the sale, I reminded the salesman it needed premium gas. He was surprised....
I know what my LT1s with automatic transmissions sound like but this LS1 with the M6 is a different animal.
Can someone who has owned this engine for a while tell me what I should be hearing from it? Thanks....