103 question
no replacement for displacement!
Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
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From: Northeast Ohio
RE: 103 question
3.875 bore x 4.375 stroke= 103.2 Cubic Inches x potential 1.2 hp/tq per cubic inch = 123.8hp/tq
3.885 bore x 4.375 stroke = 103.7 Cubic Inches x potential 1.2 hp/tq per cubic inch = 124.5hp/tq
3.950 bore x 4.375 stroke = 107.2 Cubic Inches x potential 1.2 hp/tq per cubic inch = 128.7hp/tq
Not enough to be able to tell a difference between the first two, and from the 103 to the 107, 4 cubic inches at a best of 1.2hp/tq per cubic inch, apotential of an extra 5hp and tq.
This is potential with absolutely everything being near perfect, most will never realize numbers near to those, but it gives you an idea of what the differences are.
3.885 bore x 4.375 stroke = 103.7 Cubic Inches x potential 1.2 hp/tq per cubic inch = 124.5hp/tq
3.950 bore x 4.375 stroke = 107.2 Cubic Inches x potential 1.2 hp/tq per cubic inch = 128.7hp/tq
Not enough to be able to tell a difference between the first two, and from the 103 to the 107, 4 cubic inches at a best of 1.2hp/tq per cubic inch, apotential of an extra 5hp and tq.
This is potential with absolutely everything being near perfect, most will never realize numbers near to those, but it gives you an idea of what the differences are.
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Seasoned HDF Member
Joined: Jun 2006
Posts: 28,524
Likes: 3,953
From: Vermont
RE: 103 question
Well I was going to just do the 103, and since the bore price would be a one time cost no matter how much you have to take off and the piston kits are all the same price I might as well go with the 3.885. I'll have to research the 107 a little more because the cam states good for a 96 or 110 with flattops and can be used in a 103 with dished pistons so I'd have to look at what I could do with a 107 and how it would work.
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