799 Freeze Plug Size???
02-15-2016, 10:32 AM
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799 Freeze Plug Size??? I have a 5.3 aluminum vortec L33 engine. A recent cold spell weakened one of my freeze plugs in the 799 heads and it blew out on me about a week after it got cold. I thought it had antifreeze instead of just water but luckily nothing but the plug was damaged!!! I can't find ANYWHERE that can give me the size plug I need to replace it with. I don't want to use the rubber plugs so I need to know the size metal plug to buy. I called 2 dealerships but they couldn't tell me squat either. It literally blew their minds. One dealership even told me they don't the have freeze plugs on them??
02-15-2016, 08:42 PM
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This seems to be a million dollar question. I've seen on other forums where the 799 heads expansion plug is 35mm while others say 38mm? I thought sm1 on this forum would know for sure. Even the guys at 2 different dealerships couldn't give me an answer.
Last edited by blackwidow98; 02-15-2016 at 09:07 PM.
