440-6, stealth heads, stock manifolds, SRP 10.5:1 forged pistons, Lunati 60303 cam/lifters, 10.2CR, starts and runs good. Brad Penn 15W-40 with Wix 51515 filters. Rattle lasts for approx 5sec. Before I pull intake to check lifters, hoping to get some opinion from the experts here. Rattle occurs after engine has sat for 6-7hrs. Cold startup below: