Thread: Crankshaft prep
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Old 01-13-19, 09:04AM   #21
blykins
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Join Date: Jan 2019
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Quote:
Originally Posted by Mr. PBody View Post
A good radius in the fillets is mandatory. The BBC rod mod is a good thing. Using Icon 428 pistons and shortening the stroke up about .050, the 6.8 rod is just right. Be sure the grinder understands "radii" AND offset-grinding.

The oil chamfer is also a good place to "help". A leading trough on the main and a trailing one on the rod does the trick. No sharp edges.

Jim
I'll have to do a +1 to all of this. I usually do BBC journals on all of my Pontiac crankshafts. The 6.7, 6.860, or even a 7-7.1" rod works really well on short stroke engines. A fat radius on the journal is paramount, followed up by a quick bearing width clearance check.
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