as earlier stated a lean mixture causes high cylinder temputatures, overly retarted timing will also cause higher temuratures
if you have a mass air meter calibrated for larger injector than you have the engine will run lean, causing higher cyl temps which may lead to engine ping, the computer will compensate for this by retarding your timing. that will compund your problem. Also if your engine has alot of compression exhast temuratures will also be alot higher which can cause your problem either way it should be no huge problem mechanicly, although the high exhaust temps will add stress to your exhaust valve, but if your engine continues to do this steps to protect adjacent plastic peices would be advised anywho thats just what I know.....
Sean 89 mustang LX
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