Weird Port blockage in Exhaust runners
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62Cometman
- Posts: 80
- Joined: Tue Oct 03, 2017 4:47 pm
Weird Port blockage in Exhaust runners
Hey guys so I got in a set of 289 heads with the later 1.780 and 1.480 intake and exhaust valves. I was disassembling them today and noticed that in the exhaust runner there is a large bump that i can figure out why its there. Its not there for the coolant passages. Its not there for a threaded hole or anything and its obviously not there for oiling and i can not figure out why its there? Was hoping you might have some ideas. And if it doesnt serve any purpose like i think it doesnt then I should just be able to grind it away to increase my exhaust efficiency.
62 Comet 170, dagneham trans, 2.8 7.25 rear 260 T5 8 inch swap planned for the future.
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Santa's Comet
- Posts: 250
- Joined: Wed Jul 31, 2013 2:48 pm
Re: Weird Port blockage in Exhaust runners
I think those humps were for IM air injectors. Used on certain vehicles.
NP Dave.
NP Dave.
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Lip Ripper
- Posts: 1870
- Joined: Wed Jun 06, 2012 6:47 am
- Location: Lake Placid, Florida
Re: Weird Port blockage in Exhaust runners
I agree, for EGR. They were casting for the future. I ground them out of my 351W heads back in the day.
66 Cyclone GT; 245/60R15's on 15x8's and 215/70R15's on 15x7 Magnum's.
There's nothing like the sound of a pushrod V8 singing at the top of her lung's.
There's nothing like the sound of a pushrod V8 singing at the top of her lung's.