351C head question.
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Joined: Jul 2000
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351C head question.
I am building a 72 351C, there is a round hole in the middle of the intake side of the head, over the exhaust gas port that feeds into the intake. What does this round hole do? Why is it ignored by the intake gasket and aftermarket manifold? What do I need to do about it?
Posting Guru
Joined: Aug 2000
Posts: 2,416
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From: PacNW
351C head question.
I don't know exactly what the purpose of the hole is but it doesn't do anything. There's no passage from it into the combustion chamber or ports. Maybe it's used during the final milling process' when the heads are at the factory.
Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
351C head question.
shawnb,
Yeah, it's a blind hole that doesn't connect to any internal passages. When the intake manifold is installed, that hole sits above the intake manifold, exposed to the elements. I usually fill it with silicone just to keep it from accumulating any crud. Otherwise, you can just ignore it.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
Yeah, it's a blind hole that doesn't connect to any internal passages. When the intake manifold is installed, that hole sits above the intake manifold, exposed to the elements. I usually fill it with silicone just to keep it from accumulating any crud. Otherwise, you can just ignore it.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
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