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#21
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Curious on guys using the Best Graphite seal what your crank is - serrated or smooth? Well wondering on all using BOP seal too. It is my understanding the Best seal works best on a smooth crank not serrated one. And BOP seal is better for serrated. Or maybe vice versa. But experts chime in please.
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#22
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#23
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Here’s what I’ve determined in my saga to seal up my engine. Someone can correct me if I’ve got it wrong:
You can use be Best seal with serrated stock cranks and aftermarket cranks. It’s generally less finicky and more forgiving than the BOP if something is off. In either case, the serrations need to be checked. Aftermarket cranks are more likely to need to be smoothed. You should use a BOP with a smooth crank.
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Ken '68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - 3.55 posi (build thread | walk around) '95 Comp T/A #6 M6 - bone stock (pics) |
#24
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On the one piece seal I have seen two different videos on the install where they test fitted it and it crumpled up just a bit. Like it was just a smidge to big. One person just trimmed it every so slightly and the other person sanded the outside down.
I guess the point here is to test fit it first and look it over very carefully. |
#25
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Triple Black 1971 GTO |
#26
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Trimming the end of the seal was the first instruction, but now BOP recommends sanding the outside of the seal. If the seal sits square with the centerline of the journals then either method will work. If a slight correction needs to be made to center up the seal, then sanding does both the centering and reducing diameter.
The below seal was damaged in shipping when a crank molested it, and I just didn't trust that it could be returned to a usable shape. You can see that despite my best efforts the metal band still isn't really round. We cut the Viton away to get a look at how it was made. That skinny section of metal is at the opposite end of where it is marked to be cut and I suspect that this narrow section allows it to more easily twist around the crank when putting it in position.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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