Technical Need you fine gentleman and scholar advice.

[STE92]

I been having random issues with smoking past few months, after several times doing compression and leakdown test coming out perfect motor finally gave out. During a datalog test trying to fix a misfire in cyl 4 the engine gave out and the signs of the issues that the motor has been having finally really show. Here is the setup and test numbers for compression and leakdown test. My question is with results, I think I might refresh the head and slap it back on with upgraded parts or should I just find lower mileage engine and replace it. Really appreciate you guys input if you guys have any questions please lmk thanks!

154k motor/auto
JPworkz st 6266
Jb4/BEF
BL coils
MMP PI W/ pi controller runnin BMS kit 100% Meth 23psi few pases of 28psi
Stage 2 pump
Pcv BMS bad external RB set uP

NUMBERS:
Cyl 1-50 90% (Bad exhaust valve) can hear Air rushing out of exhaust.
Cyl 2-180 10%
Cyl 3-185 2%
Cyl 4-180 3%
Cyl 5-180 2%
Cyl 6-175 15%

 

[dyezak]

You found the problem, but you need to know why the problem popped up before you can make the right decision. Is the damage mechanical? Maybe FOD damage to the valve or seat? Or is it operational? Perhaps a Cyl1 lean condition that burned the valve?

Regardless I think it's time to pull the engine and remove the head to figure that component out.