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#1 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Odd holes drilled in edlbrock aluminum intake
A friend gave me an edlbrock intake manifold a while back, I was looking at it today and noticed two holes drilled in it, one about 3/8” and the other about 1/4”. I can see them looking down through the carb mount. They don’t look factory as one has slag on the edge from drilling. Any idea why someone would drill these holes? I’ll take a pic tomorrow when I go to my shop.
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#2 |
Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Odd holes drilled in edlbrock aluminum intake
Extra Vac ports?
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#3 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
They’re inside the manifold, they would be right under the carb if it were mounted
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#4 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Nitrous nozzels maybe!
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#5 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
Right inside below the carb, not sure what the intake of an intake is called! . Pic is for reference
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#6 |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
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Re: Odd holes drilled in edlbrock aluminum intake
Egr crossover, to reduce emissions
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#7 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
Could they be stock? They are both on one side and seem to drilled in a random fashion.
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#8 |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
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Re: Odd holes drilled in edlbrock aluminum intake
Probably not factory
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#9 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
I’m thinking of filling them with some aluminum rod, will it make a difference, I don’t have to ever smog it, building a backup engine for my boat
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#10 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Odd holes drilled in edlbrock aluminum intake
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#11 | |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
Quote:
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Odd holes drilled in edlbrock aluminum intake
Is the intake a single plane like your reference pic or a dual plane like my link shows?
That could be the difference. |
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#13 |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
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Re: Odd holes drilled in edlbrock aluminum intake
After thinking about it, is the 1/4" one slightly forward of the 3/8"?
If the 3/8" is being used for egr function, the 1/4" would be used for PCV if being used with valve covers without a pcv |
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#14 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Odd holes drilled in edlbrock aluminum intake
Tap them and use lock tite.
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#15 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,339
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Re: Odd holes drilled in edlbrock aluminum intake
I'm still clueless on what holes you are talking about...............
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#16 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
I was wrong, the holes are on either side. It is a dual plane intake. Should I bother plugging them or just leave them alone?
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#17 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Odd holes drilled in edlbrock aluminum intake
Good to know I'm not the only one! Apparently there are no such holes in the reference pic, which is what I was looking at.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#18 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Odd holes drilled in edlbrock aluminum intake
I’d drill them both the same size, tap them and put plugs in. Then jb weld to seal them.
That way you know you want have any leaks. |
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#19 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Odd holes drilled in edlbrock aluminum intake
Geezer posted a link to a pic, mine is just like the pic. Don’t know why I was thinking the holes were on one side, might have been the beer I drank after work!
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#20 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Odd holes drilled in edlbrock aluminum intake
Sounds like a cheater NOS nozzle installation....one for NOS, one for fuel....
They hide the nozzles inside the manifold.... Post a pic of the manifold...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox ![]() ![]() ![]() |
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#21 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Odd holes drilled in edlbrock aluminum intake
![]() Look like EGR passages to me
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#22 |
Registered User
Join Date: Aug 2013
Location: Fort Worth, TX
Posts: 309
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Re: Odd holes drilled in edlbrock aluminum intake
Looks like a modification for the choke coil. Maybe?
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Zane's 71 Build |
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#23 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Odd holes drilled in edlbrock aluminum intake
EGR feed ports...
Ones in plenum, just tap them and plug them up. Put metal cover over EGR exterior port... Block off choke heat riser port if you are using an electric choke carb... ![]() ![]() ![]()
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox ![]() ![]() ![]() |
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