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Re: Engine vaccum - 90' Suburban
18psi is in the right neighborhood especially considering its likely the engine is at least worn some. When does the puff happen and what color is it? Most of the time a puff from exhaust in a sbc is valve seals.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
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