i have a 98 trailblazer i was wondering what the main jets size is and i have added a dg pipe k&n filer with air box mods (hole in it)
and it is bored .20 over with a wiesco piston.i was wondering what size jets i should start with or an idea to start with i live in north east ohio but dont know the esact altitude. thank u for your help

 

I have a '00 TB with a HPD pipe and run without the snorkel tube on the airbox.

The stock main jet was a 130.

I'm in Florida (sea level) and have my needle clip at the fourth position down from the top and use a 160 main jet and it runs great.

Hope that helps give you a reference point.

 

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