Long story short, turns out back in late may 2023 I cracked the head on this car which explains the “expansion tank” issues I was having. I raced/codrove it like that for a year without much issue. In April 2024 after an event I decided it was time to dive in as the “expansion tank” issue was getting worse.
did a compression test on it and every cylinder checked out great which was weird
did a leak down test and cyl 5 took a shit cracked from exhaust valve to spark plug
sourced 2 spare heads, took them to the machine shop & they fixed them all up & then they cracked them both in the fixture when pressure testing lol. (Clamped them wrong)
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Shit happens and they ended up sourcing 2 heads fairly quickly - just something to note if you’re dropping these off at a shop that normally doesn’t touch these heads, make sure they clamp them down from the head bolt area and aren’t just putting a bar across the top of the head.
Raced gf’s Supra for most of 2024 & didn’t have much motivation until recently to get this back together.
turns out a few of the bores on the cam trays had some pretty bad scoring so grabbed a set from my spares since I had to reshim the solid lifters anyways
this is usually the longest part of the process but it’s pretty straight forward, putting the cams in/out a few times to measure is the longest part
also did valve seals because everything was part anyways
Just in case anyone is curious since I had to buy spare motors to source heads lol:
slapped it back together over the weekend with oem headbolts, Running distilled water&water wetter instead of coolant because I hate cleaning up coolant. Also don’t let me forget for the winter lol.
plugged the laptop into ms3, hit the key, everything still worked & it fired right up.
beat on it a bit & temps held around 190-195, didn’t have any weird leaks, expansion tank issues, etc -so hopefully it’s good to go. Still need to drop the current oil/filter, bleed brakes, check PS fluid, move fixed seat forward, address dumb valve cover leaks & re tape radiator gaps
might run this at the next RA event or just wait for a USAIR lapping day to fully shake it down