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i have some that are 1.065 with a 6.750 rod
some that are 1.120 with a 6.700
seems to really be no difference in power


Ive lately been using the 1.065 for NA stuff and i can do a 615 or a 632 with the same part by changing rod length
 

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I ran a 6.65 rod on my 632 nitrous motor so I could get the rings where I wanted them. Never one issue and ran the motor to 8200.
 

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Discussion Starter #13
It's tough to get a 4.75 stroke in a Ford block. Although it has a 10.300 deck. It has shorter cylinders than the BBC. Pin pulls out of the bore a bit too much at BDC. Piston rocks more. More skirt wear.



Works OK with A Root Aluminum block better. 6.500 longer cylinders.
 

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It's tough to get a 4.75 stroke in a Ford block. Although it has a 10.300 deck. It has shorter cylinders than the BBC. Pin pulls out of the bore a bit too much at BDC. Piston rocks more. More skirt wear.



Works OK with A Root Aluminum block better. 6.500 longer cylinders.
Got your work cut out for ya....
 

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Discussion Starter #15
Currently looking at 4.700 bore X 4.55 stroke. Gets close at 631. 1.25 CH. .043 .043 3 MM. 6.775 rod. Maybe 1.200 CH and 6.8 rod. This one puts a .990 pin fully in the bore at BDC.
 

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Currently looking at 4.700 bore X 4.55 stroke. Gets close at 631. 1.25 CH. .043 .043 3 MM. 6.775 rod. Maybe 1.200 CH and 6.8 rod. This one puts a .990 pin fully in the bore at BDC.
Sometimes it's better to sacrifice a few cubic inches for a little better rod/stroke combination and a "happier" engine.
 

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Currently looking at 4.700 bore X 4.55 stroke. Gets close at 631. 1.25 CH. .043 .043 3 MM. 6.775 rod. Maybe 1.200 CH and 6.8 rod. This one puts a .990 pin fully in the bore at BDC.
It seems the trend these days is smaller OD pins with thicker walls.
 

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It's tough to get a 4.75 stroke in a Ford block. Although it has a 10.300 deck. It has shorter cylinders than the BBC. Pin pulls out of the bore a bit too much at BDC. Piston rocks more. More skirt wear.



Works OK with A Root Aluminum block better. 6.500 longer cylinders.

6.25" cylinder length in Eliminators iron block. C&C can supply up to a 12" deck height in alum.

C&C's 11.2" with a 4.75" strike and a 7.2" rod makes a nice combination for a BBF.
 
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