Pull the squirters, I'd replace the bolts/valves anyway, Make sure if it's to be bored/honed you take the timing case cam tensioner and bolt and have it torqued to 35 ft/lbs as it distorts #1.
Are you planning on replacing the AUX shaft bearings?
They will "look" squashed as they're most likely "11" series plugs factory gapped to 1.1mm/44 thou, once you tap them down to sub 30 they look a little Mongy...
If the Pistons had touched them with enough force to create that sound they'd be smashed flat and the Porcelain would be shattered...
Researched this many many years ago (about 14) to the point I bought a Blower so I could size up the installation, ended up not proceeding and went the far easier Turbo route as I wanted to maintain ALL of the features that make a Supra a Supra, fitting a Blower meant compromises and...
BIG Block of wood between the crank and the side of the block and a big breaker bar, maybe a cheater pipe on that as the Damper Bolt "Should" be done up to 195 ft/lbs.
If doing it on an engine stand have a Helper handy so you don't roll it.
Here's how I did mine way back, can has a K&N Filter inside.
Benefit of this routing is less chance of water ingress if you drive through standing water.
My guess is some genius has removed the Caps/Suppressors from the ALT and anything else high load/noise that needs them and this is why you're getting the noise in the radio.
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