Extremely loud valvetrain after head swap help please
Extremely loud valvetrain after head swap help please Swapped in some PRC 5.3L 2.5 heads milled to 61cc chambers (I believe milled down .015) and tsp 1 7/8 headers and 42lb injectors on top of my LQ9 iron block 370. When I cranked her up, there are extremely loud tapping sounds coming from each valve cover. At first I thought the rockers were hitting the valve covers but I pulled the covers and they looked fine. I was told by TSP that my 7.400 comp pushrods would work just fine. The guy tuning my car used his push rod length calculator and he came up with around 7.375-7.390. Would a pushrod that is .025 too long cause such loud tapping sounds? TIA.
Bryan
Bryan
If that noise did not get progressively quieter very quickly and become close to a normal valve train sound within a couple of minutes the key would have been shut OFF. I certainly wouldn't have run it "for close to an hour" making a racket like that in hopes that it would quiet itsef down. It's going to smoke like hell and make enough racket when initially started that you have to grit your teeth, but it should very quickly start to quiet down the smoke should disappear. In less than 5 minutes the motor should sound normal and the smoke should be gone. What about your preload.
