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Old 09-25-2002, 11:32 AM
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I've been given two sets of SBC connecting rods and would like to identify them. I don't know if either set is HP or what. One set has the squared lump on the lower cap, the other is rounded, smooth around the circumference of the cap with no 'chunk'. Are there any telltale markings I can look for?

Also, how do I determine if they're 5.7 or 6 inch without taking them to a machine shop? I have mics and know how to use them but do not have a way to effectively locate the bore centers close enough to get a good measurement.

Thanks, Larry

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Old 09-25-2002, 04:51 PM
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If you have a set of dial calipers, you can measure from the very top of the pin bore to the very bottom of the big end. Then measure the pin bore diameter, and divide by two; also measure the big end diameter and divide by two. Subtract your final number for the big end and pin bore, and subtract those numbers from your first dimension, this will roughly give you the center to center distance.
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Old 09-25-2002, 04:54 PM
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Also, keep in mind that alot of small journal connecting rods don't have any "tear drops" on the sides, and they all had 11/32 inch bolts.
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Old 09-25-2002, 06:09 PM
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Hmmm, looks like I didn't think this thing through long enough to figure that out! Ha! Pretty basic math.

Not sure what you mean by tear drops but I'll have a look and figure that one out.

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Old 09-25-2002, 06:42 PM
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If you look at a stock large journal rod from the side, you'll notice that at each corner of the rod, there is a beefed up area , it almost looks like a squared corner. Most small journal rods don't have this, they look completely round, except for some small journal 327 rods, which have the rod cap beefed up kind of like a 350 rod. Anyway, the small journal stuff is smaller on the big end, I used to know housing bore size by memory, but Alzheimer's is chipping away at my brain. These beefed up areas are what I call a teardrop.
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Old 09-25-2002, 06:44 PM
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Why do all that math...Take the cap off- put a straight edge across the bolt holes - take a tape measure and measure to the center of wrist pin hole...the difference between 5.7 and 6 " is about 1/4" you should be able to get close enough to the center of the wrist pin hole to tell what you have....GlennK
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