Block Differences?
Tuned
Joined: Nov 2023
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With the little bit of info I can find, it appears as the blocks are the same. Both come out of that Windsor Canada Ford plant.
6.8L has tadbit higher compression pistons, shorter rods, cast crank. 6.8L gets the 10L100 gas tranny.
Have not found info on the cams and heads.
6.8L has tadbit higher compression pistons, shorter rods, cast crank. 6.8L gets the 10L100 gas tranny.
Have not found info on the cams and heads.
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Fleet Mechanic
Joined: Jul 2004
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That's what I am thinking, but have not been able to confirm yet. There is some debate about the crank too. It is shorter stroke than the 7.3L but some sources say it's cast, some say forged.
Tuned
Joined: Nov 2023
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The shorter stroke is from shorter rods. Deck height of blocks are probably the same.
Tuned
Joined: Nov 2023
Posts: 431
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Yes that is right. I was stuck on something from 1988 I built my last junkyard SBC with the guidance of Dr. Chilton.
I thought I had read something about different rods but I am unable to find it again so it must have been a dream.
Looks like only know differences is crank and 6.8 gets the 100G tranny. It would be good to see a definitive parts list of the 2 motors to compare.
I thought I had read something about different rods but I am unable to find it again so it must have been a dream.
Looks like only know differences is crank and 6.8 gets the 100G tranny. It would be good to see a definitive parts list of the 2 motors to compare.
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Hotshot
Joined: Jun 2003
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From: SW VA
Yes, but the rods still could be a different length depending on the pistons and crank.
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Fleet Mechanic
Joined: Jul 2004
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Thanks for all the replys, it does appear the blocks are the same between the 7.3L and the 6.8L. The crank is the only notable difference. The 6.8L must either use a longer rod or a piston with the pin located lower to compensate for the shorter crank throws.
The other question I can't seem to find an answer to is how much does a bare 7.3L (or 6.8L) block weight? I can't believe no one has weighed one yet, but all I can find so far are inaccurate guesses.
The other question I can't seem to find an answer to is how much does a bare 7.3L (or 6.8L) block weight? I can't believe no one has weighed one yet, but all I can find so far are inaccurate guesses.
Tuned
Joined: Nov 2023
Posts: 431
Likes: 247
Thanks for all the replys, it does appear the blocks are the same between the 7.3L and the 6.8L. The crank is the only notable difference. The 6.8L must either use a longer rod or a piston with the pin located lower to compensate for the shorter crank throws.
The other question I can't seem to find an answer to is how much does a bare 7.3L (or 6.8L) block weight? I can't believe no one has weighed one yet, but all I can find so far are inaccurate guesses.
The other question I can't seem to find an answer to is how much does a bare 7.3L (or 6.8L) block weight? I can't believe no one has weighed one yet, but all I can find so far are inaccurate guesses.
All I want in my 6.8 is not to have the 7.3 lifters.
I was planning to take my motor out and weigh it but I keep getting side tracked. Hopefully I will get this motor weighed soon.
Lead Driver
Joined: Feb 2005
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From: The Great State of Texas
The rods are likely to be longer to accommodate the shorter crank. Another question how did Ford increase compression. Different pistons or heads?
Laughing Gas
Joined: Aug 2018
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I don't think it makes sense for Ford to redesign the head for a 6.8. The pistons are likely to be the same, with only the rods being a little longer. The little bump in compression is probably gained in rod length.
Lead Driver
Joined: Feb 2005
Posts: 7,923
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From: The Great State of Texas
Increasing rod length to increase compression assumes that the 7.3 piston surface is below the block deck surface which I don't think it is.
Hotshot
Joined: Jun 2003
Posts: 12,340
Likes: 4,361
From: SW VA
The rod length on the 7.3L is 6.139"
https://www.hemmings.com/stories/ford-73l-godzilla-v8/
Can't find info on the 6.8L
https://www.hemmings.com/stories/ford-73l-godzilla-v8/
Can't find info on the 6.8L
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