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Old 01-17-2005, 04:02 PM
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Blocked coolant passage.

I noticed something when taking apart my topend for what I thought was headgasket leak (thankfully it doesn't look like it ).

On my TPI manifold, coolant is only allowed to pass through the manifold in the front. The back passage was cast solid. Is this normal for SBC intakes, or something GM did for this particular manifold? Why would it be cast like this, and how does it affect coolant flow and engine temps?

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Old 01-17-2005, 04:19 PM
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Gm intakes have way to uch heat in them anyway. The blocked passage helps lower intake temps without completely doing away with the cold morning restart. Especially with injected fuel mapping. I've been known to close off the intake port's before. Now I use four corner water..
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Old 01-17-2005, 04:20 PM's Avatar
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It is common on small blocks. Even the manifolds that have water crossovers are sometimes blocked or restricted by the intake gasket. To force coolant direction to the front of the block, or in some cases to the heater outlets..
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