Stamped Rocker Clearance Issue?
Hey, having trouble with some rocker clearance. On a few (not all) the rockers are contacting the spring (not retainer). On the first picture, it shows how far down one rocker goes before interference. I can force it down, but something is definitely wrong here I think. The heads are 273 small port, small valve heads. The rockers and shaft are what came off the heads when I got them. They look stock. I was hoping to reuse them, they aren't in bad condition. I did notice that some rockers are larger than the others. (Last picture) idk if that's stock or someone before me mismatched them with other ones. Both some of the left hand ones and right hand ones are different sizes. They are comp springs and retainers that came on the heads. Not sure the part number. The diameter of the spring itself measured at 1.5 inch. Which is what I thought was okay with stock stamped rockers because when I took the heads apart, there was no visible wear on the rockers where they would be contacting now. The engine ran beforehand. Heads were rebuilt at machine shop, they reused the springs and retainers, just new valves. So in theory, they should be just like they were before. Maybe when they redid the valve seats, it changed the height of the valve tip? I'd like the just reuse the stock rocker setup because it sounds like the new replacement stamped rockers are junk and pushrods punch through them. I'm open to buying a good quality setup. Any opinions for sbm rockers and shafts for Hydraulic flat tappet .454 lift? I haven't ordered pushrods yet. Or can I clearence these rockers a little to clearance the springs? Is this common? Sorry about the long read, trying to learn. First mopar engine. Thanks everyone.
Hey, having trouble with some rocker clearance. On a few (not all) the rockers are contacting the spring (not retainer). On the first picture, it shows how far down one rocker goes before interference. I can force it down, but something is definitely wrong here I think. The heads are 273 small port, small valve heads. The rockers and shaft are what came off the heads when I got them. They look stock. I was hoping to reuse them, they aren't in bad condition. I did notice that some rockers are larger than the others. (Last picture) idk if that's stock or someone before me mismatched them with other ones. Both some of the left hand ones and right hand ones are different sizes. They are comp springs and retainers that came on the heads. Not sure the part number. The diameter of the spring itself measured at 1.5 inch. Which is what I thought was okay with stock stamped rockers because when I took the heads apart, there was no visible wear on the rockers where they would be contacting now. The engine ran beforehand. Heads were rebuilt at machine shop, they reused the springs and retainers, just new valves. So in theory, they should be just like they were before. Maybe when they redid the valve seats, it changed the height of the valve tip? I'd like the just reuse the stock rocker setup because it sounds like the new replacement stamped rockers are junk and pushrods punch through them. I'm open to buying a good quality setup. Any opinions for sbm rockers and shafts for Hydraulic flat tappet .454 lift? I haven't ordered pushrods yet. Or can I clearence these rockers a little to clearance the springs? Is this common? Sorry about the long read, trying to learn. First mopar engine. Thanks everyone.