Drilling Injector Bosses

Reply Subscribe

Thread Tools

Search this Thread

Apr 14, 2005 | 12:10 PM

12secSS

Thread Starter

TECH Junkie

iTrader: (30)

Joined: Nov 2001

Posts: 3,690

Likes: 1

Drilling Injector Bosses

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!

Apr 14, 2005 | 02:13 PM

MrDude_1

TECH Junkie

iTrader: (4)

Joined: Feb 2002

Posts: 3,368

Likes: 5

From: Charleston, SC

does this help? http://66.83.134.202/travis/L107.pdf

i just stumbled across it as i was researching some larger injectors for....uhhh... some "small" mods..

Apr 14, 2005 | 02:29 PM

12secSS

Thread Starter

TECH Junkie

iTrader: (30)

Joined: Nov 2001

Posts: 3,690

Likes: 1

That really helps! Any one else have more inputs?

Apr 17, 2005 | 10:08 PM

ChucksZ06

TECH Resident

iTrader: (9)

Joined: Feb 2005

Posts: 976

Likes: 1

I believe it is 14 mm. I modded a victor jr for my 406 sbc and purschased a bit to bore my own holes. If I had it to do over I would have bored holes undersize and sanded out to correct size. O rings will seal better I believe.

Apr 18, 2005 | 09:19 AM

12secSS

Thread Starter

TECH Junkie

iTrader: (30)

Joined: Nov 2001

Posts: 3,690

Likes: 1

Thanks Chuck! I looked at my injectors and they are O-ring and just fit on the OE style manifold. So I am going to have my machinist take a look at it and he should have it done rather quickly.

Reply Subscribe