6.9 Headbolts/studs
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Tuned
Joined: Nov 2002
Posts: 348
Likes: 0
From: Benson, AZ
6.9 Headbolts/studs
Just wondering...
I have read that on a 6.9 the headbolts are a major weak point on the the motor. Can the holes for the headbolts be drilled and tapped to the 1/2 inch size for the 7.3 or would just using head studs be better or could both be used? I beleve all in all the 6.9 and the 7.3 are the same motor just the 7.3 has a larger cylinder bore so there should be room enough on te pads for the larger bolts/studs.
Just a thought
Scott
I have read that on a 6.9 the headbolts are a major weak point on the the motor. Can the holes for the headbolts be drilled and tapped to the 1/2 inch size for the 7.3 or would just using head studs be better or could both be used? I beleve all in all the 6.9 and the 7.3 are the same motor just the 7.3 has a larger cylinder bore so there should be room enough on te pads for the larger bolts/studs.
Just a thought
Scott
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Might be possible, but going to thread in head studs would give better results than using OEM 7.3L bolts.
I'm not sure, but I think the stud sizes are close enough that the 1/2" bolt would require a tapping hole that is already smaller than the 7/16" that the 6.9 has.
I'm not sure, but I think the stud sizes are close enough that the 1/2" bolt would require a tapping hole that is already smaller than the 7/16" that the 6.9 has.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
7/16" x 14 threads per inch
1/2" x 13 threads per inch
Changing the threads per inch would make the block threads very weak.
Head studs are made out of hardened metal, the 7/16" head studs have a higher yield strength than 1/2" head bolts do.
1/2" x 13 threads per inch
Changing the threads per inch would make the block threads very weak.
Head studs are made out of hardened metal, the 7/16" head studs have a higher yield strength than 1/2" head bolts do.
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