engine help
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Senior User
Joined: Jan 2007
Posts: 242
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engine help
Is their any way you can tell just by looking at the engine if it is a 390 or a 360 cause when I bought it I was told that it was a 390 but I decoded the vin and it says that it is a 360
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Here's the easy way to check the stroke without removing the head. Get a straight 12 inch piece of white electrical house wire or coat hanger wire. Get a magic marker. Remove the number 1 spark plug. Turn the engine over until the timing mark is at TDC. Now, put the wire in the number 1 spark plug hole with the wire resting on the top of the piston. (Because the old timing dampers sometimes will slip, the timing marks may be off. Make sure the engine is at TDC in the Number 1 hole by rocking the crankshaft back a forth a bit. When the wire is as high as it will go, it is at TDC. Once you are sure it is at TDC, continue.) Make a mark on the wire even with the lip on the valve cover. Now rotate the crankshaft 180 degrees, until the wire is at its lowest point. Mark the wire again, at the lip, and measure the distance between the two marks.
Here are the specs: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
Here are the specs: 3.98 is the stroke for the 410 and 428 engines; 3.78 is the stroke for the 390, 406 and 427 engines and 3.5 is the stroke for the 352 and 360 engines.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
It aint a 390, but is a very good truck engine. The heads are better flowing than the 390, but it aint a 390. 
We have a saying round here, "They all are 390s on sale day."
John
We have a saying round here, "They all are 390s on sale day."
John
9510
