Do Cobra Heads have EGR Bumps?

NitroNixon · 10-19-2004, 11:25 AM

I just purchase a set of (real) GT-40 heads with the 3 bars, and I noticed that they do have any egr bumps in the exhaust ports. Does this mean that they were ported, or do GT40 heads already come from the factory without the bumps?

crazypete · 10-20-2004, 07:17 AM

Well, since noone else has posted their knowledge, I will toss in my 2 cents.

I got hold of a set of gt-40p heads (with the 3 bars) from a fellow who had some basic porting work done to them. Now I went in to further port them. I noticed that there were no egr bumps but there were little recesses where the bumps would have been. These recesses did not have the holes in them however and neither were there any front and back injection holes on the head faces.

So if you dont have egr bumps but have the recesses without holes in them then that, I guess, is what they are supposed to look like!

NitroNixon · 10-20-2004, 09:01 AM

Thanks for the reply. I do notice that there's a little hole where the egr bumps should have been. So my guess is that they have been ported.

10-19-2004, 11:25 AM	#1
NitroNixon Registered Member Join Date: Mar 2002 Location: DC Posts: 129	Do Cobra Heads have EGR Bumps? I just purchase a set of (real) GT-40 heads with the 3 bars, and I noticed that they do have any egr bumps in the exhaust ports. Does this mean that they were ported, or do GT40 heads already come from the factory without the bumps? __________________ 87 GT As of 2/1/06 650 DP Carb Crosswind Intake Edelbrock Performer Heads 97 Explorer Bottomend w/ B-303 Cam 1.7 Roller Rockers Flowtech Longtube Headers Flowtech H-Pipe MSD Black Wires MSD ignition MSD Distributor Blaster 3 Coil Electric Fan Underdrive Pullies T5 Trans Hurst Shifter Lowered 1.5" 373 Gears

10-20-2004, 07:17 AM	#2
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	Re: Do Cobra Heads have EGR Bumps? Well, since noone else has posted their knowledge, I will toss in my 2 cents. I got hold of a set of gt-40p heads (with the 3 bars) from a fellow who had some basic porting work done to them. Now I went in to further port them. I noticed that there were no egr bumps but there were little recesses where the bumps would have been. These recesses did not have the holes in them however and neither were there any front and back injection holes on the head faces. So if you dont have egr bumps but have the recesses without holes in them then that, I guess, is what they are supposed to look like! __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior Last edited by crazypete; 10-20-2004 at 07:32 AM..

10-20-2004, 09:01 AM	#3
NitroNixon Registered Member Join Date: Mar 2002 Location: DC Posts: 129	Re: Do Cobra Heads have EGR Bumps? Thanks for the reply. I do notice that there's a little hole where the egr bumps should have been. So my guess is that they have been ported. __________________ 87 GT As of 2/1/06 650 DP Carb Crosswind Intake Edelbrock Performer Heads 97 Explorer Bottomend w/ B-303 Cam 1.7 Roller Rockers Flowtech Longtube Headers Flowtech H-Pipe MSD Black Wires MSD ignition MSD Distributor Blaster 3 Coil Electric Fan Underdrive Pullies T5 Trans Hurst Shifter Lowered 1.5" 373 Gears

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