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Old 07-28-2017, 06:30 PM
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YellowRose YellowRose is offline
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To amplify what Dave said, read this...

Here is your firing order. 1 5 4 2 6 3 7 8, thanks to Dave. Here is how he explained it to me.

TDC-----BDC
1----5----4-----2
|----| ----|-----|
6----3----7-----8
TDC-----BDC

Here's the easy way to check the stroke without removing the valve cover. Get a straight 12 inch piece of white electrical house wire or coat hanger wire. Get a magic marker. Remove the #1 spark plug. With #1 at Top Dead Center (TDC) put the wire in the #1 spark plug hole with the wire resting on the top of the piston. Make sure the engine is at TDC in the #1 spark plug hole. Once you are sure it is at TDC, continue. Make a mark on the wire even with the lip. If you have not already done so, remove spark plug #4. Stick that wire into #4 spark plug hole until the wire is at its lowest point, Bottom Dead Center (BDC). Mark the wire again, at the lip, and check the markings. Here are the specs: 3.78" is the stroke for the 390, and 3.5" is the stroke for the 352 engine.

In other words, if I have this right, if the marks are at 3.78" that would indicate that it is a 390, and if the marks are at 3.5" (about 1/4" shorter) that indicates it is a 352 engine...
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Last edited by YellowRose : 08-01-2017 at 01:04 PM. Reason: Revised content
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