12secSS

iTrader: (30)

Anyone know what size holes I need to drill for injector bosses? Is it a straight thru hole, or does it have features (counter bored, grooved)? I got this neat little GM intake with cast injector bosses that are not drilled out ... yet. I searched here and everywhere, but I can't find an answer. Thanks!

Camaro_Zach

iTrader: (19)

the gmpp intake?

12secSS

iTrader: (30)

How'd you know?

LOnSLO

iTrader: (15)

You need to aim the injector at the back of the intake valve also, not just straoight down.

12secSS

iTrader: (30)

The bosses are already positioned from GM at the correct angle, they just need to be drilled. I am going to use an LS1/6 intake as a template and have our in house machinist modify my GMPP intake bosses.

LOnSLO

iTrader: (15)

Good to know.

MADMAN

iTrader: (4)

I had a endmill made with 3 steps on it. MSD also sells the proper tool.

12secSS

iTrader: (30)

Thanks for the tip MADMAN!

Camaro_Zach

iTrader: (19)

cause um...cause