Hi guys, dumb question time. when removing the EGR bumps from a stock ford exhaust port, there is a pretty good size hole left in the roof of the port
. what is the best way to fill this in? welding? jbweld? or is it ok to leave it?
I've got a 351w head that i cut up for porting practice, so i need to figure out what to do with this before i start porting for real
If it's just an exhaust hole, I would fill it with JB Weld. I've used it to fill the cross-over too. I like to mix in a little porting dust with it just for strength.
cool, thanks guys like i said, this is a chunk of d8oe windsor head that i cut up through the centerline of the valveguides so i could get an idea of what's in there before i take a grinder to my c9oe heads. i was kind of shocked to see that chunk of metal in the ports of my '69 heads
if i could figure out how to post pics on this forum, i'd show you guys this piece of head i've got
Yep, that's the hole. If you put it on a flow bench, you would see that port will flow less until you smooth out that crater!! It makes your intake so hot that you can fry an egg on it too!!
Is it the exhaust crossover (only one per head) or the EGR bump that is being referred to here?
As for the exhaust crossover, most 'air gap' style intakes already have this blocked off. If it's not, 'race' style gaskets can be used that do not have the hole for that passage, but they might burn through over time. Anytime I've used intakes with a crossover, I took them to a local welder who TIG's aluminum and had him close the hole over. You do NOT need to fill this passage on the head in. I never did on my 289 heads, and they seem to have done just fine. Any filling is more risk that it's worth. It's NOT something you want to come loose.
Do not go filling any exhaust port with JB-Weld. It works fine for intake ports, but will NOT stand up to exhaust heat. It might end up falling out and junking your engine.
As for the air injection bumps in the exhaust ports. (found towards the exits of every exhaust port)
As far as early heads are concerned, California heads are the only ones that came drilled as far as I know. Just grind out the hump and be happy. It's solid iron. No problems. If the heads ARE drilled for air injection... you can still grind the bumps out. Just be sure to plug the holes in the ends of the heads where the air pump tubing used to be. No problems. The little holes left behind do NOT need filled, and have zero influence on flow.
I agree with N20MIKE, about not using the jb weld. I have used it myself, blocking the EGR holes on my 22R headers. The stuff eventually shot out and freaked the crap out of me! Nothing like hitting 5500 RPM's and one of them bastards breaking loose
<font size=-1>[ This Message was edited by: sinistertrucker on 7/23/03 11:14am ]</font>
Well, i'm not sure what it is. it hangs down in the port from the roof right in front of the valve guide. all ports have this.and the '78 head i cut apart has a full length passage in the head that these connect to. but if it's an egr passage, what the hell is it doing in a '69 head
thanks 393clevor, that is what i am dealing with.
My heads are also the C9OE castings. i haven't got them torn down yet, so i couldn't see if that bump had a hole drilled into it or not. The head i cut apart for practice was a D8OE casting that a buddy of mine cracked open (marine engine-didn't have enough antifreeze in it uver the winter
)
so judging by your picture, i should have nothing to worry about taking those bumps out. Cool
Thanks again for the advice everyone
Bryan
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