If you rev it up a little under from under the hood, you can see if the rattle happens just as it comes off load and the rpm starts to drop. This would be my test for a rod knock. With a rod knock there will be crankshaft damage.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!