hi i am looking for a bit of info ,first up 272 y block front main bolts.i have removed the sump on some untouched engines and found the front main cap bolts are different to the others and do not have spring washers. is this normal or have i got some strange engines? secondly on one of the y block sites the guy mentions drilling a small hole under the cam area for oil to go to the timing chain , does this reduce oil pressure to the front main???