block identification
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block identification
Thought I had a 390 but now I'm not 100% sure.. every 360 or 390 I've seen has a 352 stamp on the front of the block on driver side. This block is stamped 105 backwards. Any ideas?
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
The reverse image replaced the long used 352 block. It has a bit more webbing in the bottom and considered a better block by some. Those blocks came with the heads with hardened valve seats, if memory serves.
It could be either a 360 or 390 and you will have to check the stroke to know fo sho. These were used in trucks and aftermarket.
John
It could be either a 360 or 390 and you will have to check the stroke to know fo sho. These were used in trucks and aftermarket.
John
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From: Las Vegas, NV
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set the crankshaft to Top Dead Center, with pointer at 0deg
pull plug number 1 and 4 (no 1 will be at the top of the cylinder and no 4 will be at the bottom)
take a skewer of wood or something thin and put it down the holes parallel to the cylinder wall until you touch the piston
mark the skewer on both cylinders at some point that will be equal on each cylinder (at the valve cover is my suggestion)
the difference between the two marks will be the stroke measurement
360= 4.05" bore x 3.5" stroke
390= 4.05" bore x 3.784"
that will get you close enough
pull plug number 1 and 4 (no 1 will be at the top of the cylinder and no 4 will be at the bottom)
take a skewer of wood or something thin and put it down the holes parallel to the cylinder wall until you touch the piston
mark the skewer on both cylinders at some point that will be equal on each cylinder (at the valve cover is my suggestion)
the difference between the two marks will be the stroke measurement
360= 4.05" bore x 3.5" stroke
390= 4.05" bore x 3.784"
that will get you close enough
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