HI everyone,
Background: 87-740T lower radiator hose busted a few min after I parked and spewed out all coolant. Today I finished replacing lower,upper,and expansion tank hose. Also replaced small hose on flame trap b/c of deterioration. Car had sat ~4 weeks while getting parts and time. Upon start and warmup everything I changed held fine.

Problem: While warming up I began noticing a ping ping sound I hadn't heard before. Checked oil and it is at the midway mark. No loose screws and fan wasn't hitting the shroud. Drove her over to a DIY Toyota mechanic friend,~3miles away, who said it sounded like the noise was from my lifters. So:

1.) Did something in the block get messed up when the coolant sprayed out?

2.) How could I have messed up something in the block if I was parked?

3.) I looked in the FAQ and am thinking it might be the plastic "hushers" but don't have alot of experience with valve noise. Any other ways I can check to find out the specific problem before I throw money/time at the car?

4.) Do I have mechanical or hydraulic lifters?

Thanks, Servano.
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87-740T (B230FT w/Garrett) 142k