Engine sounds much better than before, but still an issue so I went out this morning and tried adjusting lifters on passenger side to isolate that loud tick. There is still the exhaust leak so that is loud in the video.
took a video of operation after the adjustment, and the oil is burning off the exhaust manifold.
These are retro-roller lifters and I read that they can be noisy but there is a single tick hitting and the video does capture that if you listen closely:
Comp CAM parts:
new CAM --- Grind #12-409-8, Extreme 4x4 Retro CAM X4258HR
new retro-roller lifters --- 853-16
new pushrods --- 7955-16
new roller rockers with roller tips --- 1617-18 Ultra Pro-Magnum
New GMPP Vortec heads 25534421
http://www.strokerengine.com/VortecHeads.html
Not a stroker engine, original crank, connecting rods, and flywheel
New pistons, .060 inch over, new rings
New main and rod bearings, don't remember size needed
New intake manifold
Short Block put together WITH my machinist's oversight, plastic-gauged bearings
10:1 compression
91 Octane fuel
I set pre-load per Comp CAMs instructions, 1 full turn after zero-lash.
Used mechanics stethoscope and noticed big difference between exhaust rockers (sounded just fine) and intake rockers: each intake has a noticeable tick.
The tick in the video seems to be located in the cylinder 6 and 8 areas.
I have sent an email to Comp Cams and included the same link to the youtube video as above. Their forums have many responses to other customers that their roller lifters are noisy and sound like a sewing machine. Okay I buy that, but that single tick bothers me. I assume it is a valve train issue, but could it be some other rotating part that is hitting something else?
I did watch the CompCAMs video on all of this:
I did soak the lifters in mineral spirits when I got them, followed by a good soak in clean engine oil (Mobil 1)
Suggestions welcome on isolating this tick