Personally I have never used Bosch. A friend of mine with a 91 Blazer had used them for quite a while until he had one cracked on the #7 cylinder and has been using Autolites ever since.
I've been running the Delco 41-110 plugs in mine and will probably pull them and check em out because they've gotten about 30k on them. Might add it to my list next time I do an oil change and if they look like crap, swap over to the TR55's.
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There is no replacement for displacement...
99 Camaro Z28 M6 - Sold Aug 2013
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