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Old 12-13-2005, 11:39 PM
macandemsdad macandemsdad is offline
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chevy 305

Does anyone know where i can find out what year my chevy 305 is? It is in a 74 gmc 1500 original owner took out the 350 and put in a 80's 305 I need to know timing and plug gap. needs a tuneup bad.
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Old 12-14-2005, 01:14 AM
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Well a 80's 305 vin H and F have a spark plug gap of .045
With vacuum advance plugged in I believe timing is at 10 degrees sorry can't remember lol.
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Last edited by justen; 12-14-2005 at 01:35 AM.
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Old 12-14-2005, 02:42 PM
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I know.... I know.... go to http://www.mortec.com/links.htm scroll all the way down, and it explains all the engine numbers, and where to find them..
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Old 12-14-2005, 03:55 PM
macandemsdad macandemsdad is offline
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hei distributor
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Old 12-15-2005, 02:11 AM
macandemsdad macandemsdad is offline
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got it it is a 1985 305. after lots of scraping grease and a mirror found a date on the back of the block. thanks for all the help
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Old 12-15-2005, 07:47 AM
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if it's a 1985 305 it will be either vin H or F. The spark plug gap is still .045 and both vin numbers use the same spark plug. According to this book.
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Last edited by justen; 12-15-2005 at 07:50 AM.
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