I Have a bit of a rattle on the head, when i accelarate at about 2000 to 2500 i have a bit of a rattle/tap. Am not sure if its the chains but it does'nt seem that bad for the chains. When i bought the car i did a full oil change with filter and flush and that did make it a little better but its still there. If it was the chains/guides do these start quiet then get worse. Thanks for any info