help annoying pop in exhaust

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Im with madscientist,i would get a leak down tester & put TDC #1 & see if its leaking past vales then look @ lifter preload. I worked on a small block chevy a long while ago that had very close to your problem turned out to be a flat camshaft lobe. It didn't have noisy valve train eather. Spelling sucks sorry.
 
If you do a leakdown test and it comes up negative, I would get to tapping that exhaust valve a dozen or so times to see if things change. Be careful not to drive the valve into the piston. Tap, not pound.Try to do it on a fully warmed up engine, getting it done as quickly as possible while everything is still good and warm.
 
So I took a feeler Gauge checking preload and #1 exhaust had lots of play I taped .047 feeler up made a shim to take slop started and the pop is gone!!!! Pull shim it's back.... so the exhaust valve isnt opening fully gonna get new rocker and try that first as a fix. Any other ideas?
 
I guess if push rods are good rocker arm doesn't fix it the leak down was good that goes back to the reply like the sbc it has to be a flat cam lobe. I really appreciate all the reply and info to get me in the right directions thanks. Also I will post what the actual problem is and what the fix is
 
Your welcome! Its a pain. in the A but if tou have a real good magnet & the lifter hasn't been in there for a long time you can remove rockers & push rods & pull that lifter & see if the bottom of it is now a shot glass! I did the same thing on my 1st cam swap back in high school (bout 20 yrs ago! Lol) Let us know what you end up finding!
 
Hipo65 said:
Your welcome! Its a pain. in the A but if tou have a real good magnet & the lifter hasn't been in there for a long time you can remove rockers & push rods & pull that lifter & see if the bottom of it is now a shot glass! I did the same thing on my 1st cam swap back in high school (bout 20 yrs ago! Lol) Let us know what you end up finding!
Click to expand...

Like this? I pulled this one out of my 318 on Saturday. Sorry if the pic is upside down, my iPhone isnt being cooperative.
 

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Ok removed rocker arms and shafts for fun I pulled push rods exhaust rod was visually shorter I had some laying around dropped it in bolted up and the pop is cured so the problem was incorrect length pushrod #1 cylinder exhaust valve
 
Well jiminy. I learned something new on this one. I thought that valve was hanging up. But in fact it was opening very late and closing very early. Its a wonder the pushrod stayed in the cups!
I also wonder how that one short pushrod ever found its way into the engine in the first place.
thank button pushed.
 
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