I am finishing up porting my base intake. In the bottom of each runner is a hole approximately 1/8" in diameter through which EGR gas is introduced. I know that some amount of metal filings must have gone into these holes. What methods did you use to remove these metal chips and how did you ensure that there were none left?

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1990 Roadster

 

I flushed mine with water and blew it out with compressed air. I did it several times.

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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Ditto, except I used spray brake cleaner with air.

 

You guys didn't attempt to remove the plugs in the bottom of the manifold?

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1990 Roadster

 

I did remove the plugs on the bottom. Didn't have an allen large enough though so I found a bolt with a head size that fit and welded a tee-handle on it. Now I have another odd tool rattling around in the bottom of my box




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'88 IROC that looks suspiciously like a Jeep.
It's like a 3rd-gen with the aerodynamics of a brick but that'll go about anywhere!
Engine: 383 TPI, Vortec heads, ported plenum, runners, and highly modified base. 1.5:1 roller rockers, comp X4258HR cam.

 

I thought those holes were for the 9th injector's fuel? And the EGR goes up thru the tube on the passenger runner and into the plenum?

I didnt worry about the shavings, just blew out the base with compressed air.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
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If I remember correctly those passages are for the 9th injector/IAC air for cars that used MAF systems. All year TPI's also use it for the PVC system. The EGR gases get routed to the ports in the plenum right behind the throttle body.

 

There is a passage from the back of the manifold where the EGR pipe ties in, to the EGR valve and then to the front of the manifold. These holes are drilled into this passage. If I blow a cleaner into the EGR passage, it comes out in the ports of the intake through these holes.



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1990 Roadster

 

I don't know. Maybe its a Corvette manifold thing? I have three non-Corvette TPI intakes. None of them allow EGR gas to flow to those 1/8" runner ports.

 

I flushed out the holes with grease cutter first, then flushed it with brake cleaner, and finally compressed air.

Good luck!

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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.