What's the "stock length" of 351W Conn rods? I find 2 different #'s. - Ford Mustang Forums : Corral.net Mustang Forum
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Old 02-11-2003, 12:45 AM   #1
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Question What's the "stock length" of 351W Conn rods? I find 2 different #'s.

According to this site here, the connecting rod length is 5.954".
http://www.holley.com/HiOctn/ProdLin.../2411W7Sx.html

However, same site it's listed at 5.956" also:
http://www.holley.com/HiOctn/TechSer...IECPTech3.html


This site has the length as 5.956"
http://www.prewittracing.com/new_page_711.htm


So what gives?

Also, how does one "resize" a rod, is that just talking about the bearings? Is there a way to shorten a rod? Do they make rods in slightly different lengths +/- of the stock length? (Not stroker rods, but like .008 or something...
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Old 02-11-2003, 01:43 AM   #2
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The correct length is 5.956.

Resizing rods requires a special machine that most any machine shop will have. The machine has a way for the user to check to first see if the rod bearing bore is out-of-round. If it is, they simply install the rod on the machine and some small cutters or stones will bore a slight amount of metal from the bearing more to true it back up. Then, they will machine the mating surface of the rod cap down to make up for the difference in metal they needed to remove from the bearing bore to true it back up. Its pretty simple and most shops charge around $10 or less per rod to do this.
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Old 02-11-2003, 02:10 AM   #3
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Thanks. Any clue why some of the sites are listing it as 5.954" then?

If it's 5.956", then with this 9.465" deck height 351W block, I need to find some pistons w/ a 1.764" deck height.

Stupid math.
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Old 02-11-2003, 02:39 AM   #4
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Quote:
Originally posted by Dave88LX
Thanks. Any clue why some of the sites are listing it as 5.954" then?
Only reason I can think of for that is that the rods they advertise may have been resized and .004 of metal was removed. That would shorten the rod .002. Were they talking about stock rods?
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Old 02-11-2003, 04:01 AM   #5
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do you think ford actually produced those rods to a .001" tolerance??? i think not .003-.005" maybe...
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Old 02-11-2003, 04:45 PM   #6
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How long were the 69 (ish) rods? I know the decks were shorter but not by how much.
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Old 02-12-2003, 06:58 PM   #7
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From what I remember the shorter rod goes with the short deck early blocks, 1969 to 70 or 71, not sure. When rods are resized they take the cap and grind a little off the mating surface and then bolt the rod cap to the rod and hone back to factory size. Have this done when you install new rod bolts. If you are looking for factory rods, I've been told that the truck rods are a little better. The rod shoulders where the rod bolts sit on the rod are brouched instead of cut straight across. The bolt head looks like a football instead of round. The metal surrounds the bolt instead of cutting across. If I can talk the wife into takeing a picture with digi cam I will mail a pic to you. To get rods preped It will run $200 to $300. After market $400 to $600.
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