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2003 lb7 crank but no start

My 2003 lb7 has been losing coolant. It ran fine all day Friday but when I went out Saturday it would turn over but not start. Sounds like no compression and has blowback thru breather. The shop I took it to wants to replace the head gasket for about 3 to 4 grand but I'm not sure on a 255000 mile motor.Maybe I should get a crate motor for 8200. plus labor. I'm looking for your knowledgeable opinions..thanks this is my first post.

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Discussion Starter #2
2003 lb7 crank but no start

More info. my truck is stock. I bought it with 140000 miles on it. It had injectors about 120000. I've replaced the waterpump about 175000..fuel head..hubs..brakes.just regular maintenance...The truck is in good shape.no rust.not beat up..opinions?

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I had this issue last week. My truck died right after starting and would just crank. I changed the fuel filter and it fired right up. I havent had the issue since.
 
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