Originally Posted by
Walking-Tall
Replacing only the lifters in a flat tappet situation is a serious mistake to never ever do. The "teeth" of new flat tappet lifters would likely wipe out previously broken in cam lobes in short order (speaking of this, are you certain that the cam and lifters were broken in properly? (cam break in lube on lobes and lifter faces, engine first started and immediately run up to and at 2500rpm for a half hour, and then change the oil...)). Their brain is obviously in roller cam land, and I would not listen to them. Ticking is, 9 times out of 10, about clearance where there shouldn't be any, not about something needing to be freed up. My suggestion would be for you to remove the valve covers and... previously outlined elsewhere, lifter preload and non-adjustable bolt-down fulcrum rocker arm check/set procedure:
Pull the valve covers and spark plugs, rotate the crankshaft to #1 TDC compression stroke (indicated by the balancer/pointer, and the distributor rotor pointing at #1 plug wire terminal), mark the balancer or crank pulley at TDC, put another mark 180-degrees from that, and marks halfway between both those at the 90-degree spots, so you've essentially (because your balancer's TDC mark won't be straight up) got marks at 12 (TDC), 3, 6, & 9 o'clock (the cylinders fire every 90-degrees), then while still at 12 o'clock, #1 TDC compression, check #1 cylinder's (front passenger side) rockers/valves for any slack between rocker and valve stem tip, and if none, just for good measure, loosen and re-torque those two rockers bolts to their torque spec, then rotate the crankshaft clockwise 90-degrees to your 3 o'clock position and check the next cylinder in the firing order (the firing order of the camshaft, and therefore the ignition plug wire routing, is known and has been checked/verified, yes?)... continuing the same for each cylinder in the firing order, rotating the crankshaft 90-degrees between each cylinder checking/setting with your 12 & 3 & 6 & 9 o'clock marks, until all 8 cylinders have been checked/set.
... but in general, see that all of the rocker arm fulcrum bolts are tight and with a torque wrench value of 25ft-lbs... the spec for them is 18-26ft-lbs....
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