Another dumb header question
Thread Starter
Racer
Joined: May 2017
Posts: 272
Likes: 7
From: Mindenmines Missouri
Another dumb header question
I`m trying to order a set of header gaskets but need help. Where do I measure the openings on the header. Do I use inside measurements or measure from the outside of the ridge around the opening.?
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
I assume you are referring to the header flange gasket and not the header collector gasket.
Measure the port on the head. Better to order a pinch too large than too small and have to trim them.
You can get a feel for port sizes by looking at Summit Racing under the gasket category: exhaust> header>flange. You most likely want round shape unless otherwise specified.
Measure the port on the head. Better to order a pinch too large than too small and have to trim them.
You can get a feel for port sizes by looking at Summit Racing under the gasket category: exhaust> header>flange. You most likely want round shape unless otherwise specified.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Sounds right. You could buy gaskets for $20. You can buy gaskets for $40. The difference in sealing characteristics is night & day. If you have the funds I would highly recommend a laminate aluminum set. They will conform to a rough header flange and never blow-out. Percys makes just such a gasket. A little pricey compared to a fiber type gasket but well worth the money.
Measure the heads port and go from there. The header flange will take about any size gasket you offer. I doesn't really care. But correct sizing on the head is essential.
Measure the heads port and go from there. The header flange will take about any size gasket you offer. I doesn't really care. But correct sizing on the head is essential.
Last edited by HeadsU.P.; Dec 22, 2018 at 07:05 PM.
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Burning Brakes
Joined: May 2018
Posts: 797
Likes: 156
From: England AR
if your headers don't match 100% that's fine, they just need to be larger than the ports in the heads, obviously you don't want a MASSIVE diff, but 1/8 larger is far better than 1/16 smaller and presents a blockage to outbound exhaust gasses
Thread Starter
Racer
Joined: May 2017
Posts: 272
Likes: 7
From: Mindenmines Missouri
That is what I was told. The trouble I`m having is where do I measure to try and match up a set of gaskets. My headers have a raised area around each opening The inside measurements are 1.62 in. X 1.34in. But if I measure the raised area it is 2.18 in. X 1.75 in.
Burning Brakes
Joined: May 2018
Posts: 797
Likes: 156
From: England AR
sure you want a perfect fit, but rarely do you get that
go with the closest gasket to 1.62 x 1.34 but larger
Last edited by naramlee; Dec 24, 2018 at 06:30 PM.