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Welcome to 60DegreeV6.com, the best source for all your GM 60º V6 needs.
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Random Garage Images
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3.4 DOHC heads on 3x00 block
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By 3100 MPFI at 02/05/2008 - 03:48
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| This is page 2 of the 3.4 DOHC heads on the 3x00 block.
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First of all, this is a 3.4 DOHC HEADGASKET on the 3100. Sorry it is so blurry, but the items I want to point out, I have more pics of.
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This is the first glaring difference (other than the oil valley). as you can see, half of the coolant ports are OPENED UP to the exterior of the block. If you go up to the first 2 pics, you can see the coolant passages around the cylinder. The 3.4 block is thicker and has an extra cooling port.
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Now this is the 3.4 DOHC HEAD on a 3100 block. The coolest thing is that it DOES BOLT RIGHT UP. I only have 2 bolts holding it in, but they are the same fitment.
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Now for the inconsistancies.
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First of all, this is looking at the INSIDE area of the engine. The 3.4 DOHC has oil passages to feed the oil back into the block. This is not really a problem on the 3100, however you would have to make a cover for the lifter ports that also allowed the oil return for the heads.
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This is the underside of the 3.4 head on the 3100 block from. You can see that it overhangs too much, and the coolant passages are exposed (you will REALLY see this later on in the 3100 head on 3.4 DOHC block pics)
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Here is a closeup of the exposted coolant port.
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Now here is a HUGH problem. Here is an exposed OIL PASSAGE for the head. You can see that the 3100 block has NO provision for this at all. Keep in mind that the 3.4 DOHC has to flow a LOT more oil than the 3100 because of the overhead cams, so if you were to attempt to make something, keep that in mind.
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Lastly in this set is just a standing back pic of the 3.4 DOHC head on the 3100 block.
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