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Old 07-09-2010, 11:12 AM   #1
New Member
Join Date: Jul 2010
Posts: 1
Year: 1987
Coachwork: blue bird
Engine: gmc 366
Rated Cap: 78
looking for some tune up info for 366

hello fellow skoolies, I just picked up an 87 bluebird with a 366 gm engine, just wondering if any one knows what the spark plug gaps are supposed to be and what the timing is supposed to be set to, or if someone can tell me where to find this info, it would be greatly appreciated.
Just doing a tune up on it, as it didn't run too smooth on the drive home.

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Old 07-09-2010, 11:38 AM   #2
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Join Date: Nov 2003
Location: Twin Falls, Idaho
Posts: 809
366 gas tune up

I would recommend strongly to perform a compression test. First make a dry test of all the holes then again with a few squirts of motor oil into each cylinder.
Carefully determine engine condition by checking each spark plug. Each spark plug will tell that cylinder internal condition and this information will indicate what temperature range the new spark plugs should be. Use the best quality parts rather than making a parts choice by price. GM engines often require new plug wires because of the wires routing. Water/alcohol or propane is a good cheap power maker for a gas engine. Frank Hot in Idaho
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