Question about 1986 Chevrolet Monte Carlo

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Connecting vaccum i need to know where the vaccum goes and what is the timing on the engine 305 of my monte carlo 1986 if anybody are some information please let me know thanks

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  • Joshua Schofield May 11, 2010

    6 degrees BTDC, and there are a whole buch of vacuum lines so you need to be a little more specific

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I don't remember factory specs but most chevy v8's like about 8 to 12 degrees advance (BTC) Depending upon the fuel quality, you may need to pull back on that a bit. Vacuum hose is also optional as to position. I like using a carb port that is above the throttle plate so advance comes in later. If the engine "lays down" on acceleration, move the hose to any port on the baseplate or manifold that has full vacuum at idle. These are not factory settings but are the ones I used as routine when setting up those engines, when emissions equipment and inspections were not at issue. (but even so, most always passed inspection anyhow.)

Posted on Aug 27, 2009

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Wiring diagram


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