port & polish

[twgranger]

I just had my z ported & polished and had an extra boost port added will i have to change my jetting? I am now running sunoco 110 race gas too.

[BigGreenMachine]

Yupp, porting increases airflow dramaticly so your engine needs more fuel to compensate.

[twgranger]

Yupp, porting increases airflow dramaticly so your engine needs more fuel to compensate.Just the main jet or the needle too?

[BigGreenMachine]

not too sure, main jet for sure though

[gasmask]

when i had my ytz i had the same work done you did. i just changed the main jet to a 470. i had no problems...