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Discussion Starter #1
Well i have a problem that is really strange to me. When i run my car open downpipe im loosing coolant from the overflow but when i put my full exhaust on its fine. I know someone will say just leave the exhaust on and i plan on it but i want to know if this could be the start to a bigger problem.
 

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Discussion Starter #3
I did a dry compression test earlier and from 1-4 it was 200,195,200,190 the hg is about 4yrs old so i guess its time for a set of arp's and a new gasket.
 

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Discussion Starter #4
Problem fixed. It was neither hg or backpressure. I made a diy det can and found that i had a slight detonation. So I pulled some timing that i stupidly put in it and no more det or coolant issues. I hope my stupid mistake didn't harm anything. The plugs look decent and the compression looks decent.
 
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