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[GMCnet] Len. Hear are the dimentions for the intake manifold for our 403's [message #311913]

Mon, 09 January 2017 08:10

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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The stock iron 403 intake carb base surface is 2.75 inch's above the front block horizontal surface. My concern is that the Edelbrock 2711 alum intake is 3.2 inch's. But the Mondeo shop says that the 2711, and 3711 manifolds will work in a GMC.

Bob Dunahugh 78 Royale

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[GMCnet] Compairison of the dimentions for three intake manifolds for our 403's [message #312123 is a reply to message #311913]

Sun, 15 January 2017 00:13

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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The stock iron 403 intake carb base surface that we have is 2.5 inch's above the front block horizontal surface. The 307 stock Olds aluminum intake has the carb deck height at 2.5 inch's also. The Edelbrock 2711 alum intake is 3.2 inch's. But the Mondeo shop says that the 2711, and 3711 manifolds will work in a GMC. Tonight while removing my original iron intake. I found a difference as to the 307 aluminum intake. The 307 intake manifold doesn't have the bolt boss for the alternator support bracket. But that's not going to be difficult to modify that bracket.

Bob Dunahugh 78 Royale

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Re: [GMCnet] Compairison of the dimentions for three intake manifolds for our 403's [message #312135 is a reply to message #312123]

Sun, 15 January 2017 16:15

Harry

Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA

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http://www.jegs.com/photos/350AB.jpg

Lay a straight edge across the carb base.
Measure the front height, measure the back height, add the two together.
Then divide by two. That's where you get your 3.20" from.

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