LS2 Heads... What are these holes and do I need to plug them?
11-17-2012, 10:28 PM
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LS2 Heads... What are these holes and do I need to plug them? I'm currently reassembling my car after some new lifters and head refurbing. I'm having trouble remembering if I had all of the plugs for these holes or not. I have the hardware for all four holes, but only the metal pieces for two. I don't remember if I had them before disassembling or if the guy before me neglected to put them back. What do they do and are they essential? Thanks
11-18-2012, 09:00 AM
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Yeah, those are Steam vents.
You can block the rear ports and run the crossover in the front. Block offs should be on the back. The heads are identical, so they're not on wrong, just move the "plugs."
Or find a way to plumb the rears so where they are functional, is actually the better idea. There's a couple kits out there.
You can block the rear ports and run the crossover in the front. Block offs should be on the back. The heads are identical, so they're not on wrong, just move the "plugs."
Or find a way to plumb the rears so where they are functional, is actually the better idea. There's a couple kits out there.
Last edited by bayer-z28; 11-18-2012 at 09:09 AM.
11-18-2012, 03:31 PM
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Yeah, those are Steam vents.
You can block the rear ports and run the crossover in the front. Block offs should be on the back. The heads are identical, so they're not on wrong, just move the "plugs."
Or find a way to plumb the rears so where they are functional, is actually the better idea. There's a couple kits out there.
You can block the rear ports and run the crossover in the front. Block offs should be on the back. The heads are identical, so they're not on wrong, just move the "plugs."
Or find a way to plumb the rears so where they are functional, is actually the better idea. There's a couple kits out there.
11-18-2012, 05:43 PM
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^ Proper coolant system function. GM plugged the back vents for a couple years, but they started to run them again. There's something to do with pockets of air and creating hot spots that running the rear vents alleviates.
It's not an absolute MUST, but if you want to be picky..... I've been running block offs for years, but would like to make them functional again.
It's not an absolute MUST, but if you want to be picky..... I've been running block offs for years, but would like to make them functional again.
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11-18-2012, 06:08 PM
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^ Proper coolant system function. GM plugged the back vents for a couple years, but they started to run them again. There's something to do with pockets of air and creating hot spots that running the rear vents alleviates.
It's not an absolute MUST, but if you want to be picky..... I've been running block offs for years, but would like to make them functional again.
It's not an absolute MUST, but if you want to be picky..... I've been running block offs for years, but would like to make them functional again.
