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Thank you for that guide! I will figure out the TPI but as far as I can tell the engine and heads are bone stock.
I have not tried PB Blaster or WD40 yet. I think at this point though I am going to go ahead and pull the intake and give the lifter a good cleaning.
If I'm not mistaken, the 82 has a L83 and not sure off hand what differences there are between the L43 and L83. As for the gains, sure they will be minimal for now, but with other planned upgrades that are also minimal, I am counting on them to add up in the long run. I do have a feeling that something is stuck in the lifter to which is why I believe I am going to go ahead and work to pull the intake and lifter this weekend.
The L48 and L83 are identical save the pistons (& cam) GM used to get the CR from 8.NOTHING up to 9.0. Being a parts bin engineering firm, they just used the L82 pistons with the lower dish to do this. that paired with a slightly "bigger" cam got them 200hp in the L83 CFI.
Same L48 crank, rods, heads