As most know i had a fair amount of work done on the Buick engine in the ute. My concern is i have a 8-10 second knock that starts about 5 seconds after the engine fires up. I asked the mech to disconnect the balance shaft but because the gears looked really good, unlike the cam gears, he didn't and had already sealed things up and had the cam chain all properly installed, when he gave me the news. Not sure what the noise is being caused by and whether i should be concerned. Short of taking the engine back out I'm wondering if it is something I have to live with? The ute was off the road for over four weeks last time so I'm not keen to get the bloke to redo the job, which I don't think he even would anyway. I'm hoping its just the balance shaft and I can just leave it as is.