since i found the go tech engines have so much pinch you need to pre heat the engine to help start it during break in i went with a mc coy mc59 which is a hot plug as a hotter plu8g makes it easier to get up to temps during break in.

i found my go tech 5 port engine runs really well using mc coy plugs. after i did my 10 tank break in with my go tech i went with a mc coy 8 (medium) for springs races .

now that the weather is really warm i have switched to a mc coy 9 ( cold plug)