Regardless of the cause. This is a great opportunity to "build" a better engine. We all know what causes problems with these motors. This is the time to correct them.
Now that Ferrea is making the dual valve springs and valves for this engine. It should be IMO settled.
I think it's kinda funny that you don't hear alot of this from the celica guys.
I would normally agree with you and have, many times, followed my own "logic" of, if it just blew up, probably because it was overstressed in some way, this is an excellent time to add a more radical cam, higher compression, etc. etc. It might not have made sense, but I sure loved doing it, even if the cycle never seemed to stop.
In this case, however, I was "assuming" (bad idea), that if I left the motor pretty much stock, which I did, then it would be as bulletproof as a Miata, if not more so. Weeeeeell, it seems that Toyota doesn't quite have that nailed.
Allen Strommer at Mulholland Motorsports is replacing my cam. He said that his feeling is that Toyota got a run of bad intake cams. He has replaced 15-16 of them and only had one fail again. The vast majority of cams he has used were bought from Toyota. The one that failed again was a Lotus part. That makes sense, as they would have bought spares when they bought the engines.
I hope that is the cause, but I am still going to be VERY careful that my oil temps are up before going to the high cam. That won't hurt anything and might help if the sticky valve theory has some merit.
And I agree fully that it is odd the Celica guys don't seem to have problems. I have done searches for wiped cams in Celicas and found nothing.
2006 Elise, Graphite Grey/Red leather, Sport Elise Suspension, Cup airbox, ECU ref lash, MonoBalls, etc. etc.
1992 900SS Ducati Race Spec Built by Ferracci
2006 KTM 950 SuperMoto, a work in progress
Old stuff gone: Ferrari 275GTB/4, '69 1275 Cooper S. '72 500 Fiat, old Jags, etc. Never bought a boring car.