What is the purpose of these bolt holes?
08-25-2016, 07:37 PM
#2
Le Mans Master
Casting was from an older version that required a bracket there. Car is much faster if you put small Allen head bolts in there. 
Edit; I have been corrected, please see below... from F-body bracket.
Edit; I have been corrected, please see below... from F-body bracket.
Last edited by grantv; 08-26-2016 at 01:05 PM.
08-25-2016, 07:48 PM
#3
Burning Brakes
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08-25-2016, 08:11 PM
#4
Le Mans Master
08-25-2016, 08:15 PM
#5
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it's for a throttle cable bracket for cars that use the same intakes such as fbodies... someone just posted the same question a week or so back
08-26-2016, 12:47 PM
#6
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CI 6,7,8,9,11 Vet
St. Jude Donor '08
Some more interesting facts: The casting on the TOP center of the intake snout is for the addition of an EGR Tube (F-Body) as the C5 does NOT use an EGR System
08-26-2016, 10:00 PM
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Saw those bolt holes on mine and kind of wondered what they were for. Now I know. 
08-27-2016, 11:25 PM
#9
"My Dad's a TV Repairman"
That's where you messed up. Dissimilar metal corrosion caused a side-load vortex inside the throttle body. I used stainless short bolts and got an easy 10 RWHP/10RWTQ. Learned that one from the Chicago Viper guy...
08-27-2016, 11:44 PM
#10
Le Mans Master
I drilled the threads out and polished the bore...good for about 10HP...