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03-03-2013, 02:21 PM
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1978 GMC van specs
Am doing a tune-up in a 1978 GMC Vandura 25, need spark plug gap and ignition timing, thanks
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03-03-2013, 02:46 PM
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Give up more information, what motor, A/C? Trans, 2 bbl, 4 bbl or?
Assume the sticker under the hood is gone?
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Midnight Sun Street Rod Association
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03-03-2013, 02:49 PM
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Sorry, my bad. 305/auto, 4bbl
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03-03-2013, 02:51 PM
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No sticker under hood or on valve covers. have a manual but it's in my pickup 300 miles away.
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03-03-2013, 05:21 PM
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Chiltons calls for R45TS plugs gapped at .045, timing for both auto and manual trans 4* BTDC, vac disconnected and plugged, for the '78 Van 305, and 6* for a '79 305. Idle is 600 rpm for a manual trans, 500 auto.
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Midnight Sun Street Rod Association
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03-03-2013, 06:47 PM
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Thanks for the info, greatly appreciated
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03-03-2013, 06:56 PM
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Yep.....Chevy HEI ignition....045
Older with points.....035
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Ontario Rodders
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