CLASS RACER FORUM - View Single Post - Dumb question... +/- .015 on crankshaft

HP HUNTER · 02-12-2021, 10:21 AM

As far the BBC crank stroke go they can vary quite a bit, lets take a 454 cast 039 crank for instances, the factory grind had a high of 4.010 and a low of 4.002, we indexed it and ground it to 4.010. We just did a steel 454 7416 that came in at a low of 3.990, it was indexed and ground to 3.990. Just because its suppose to have a 4.00 stroke and be equal on all four pins, its NOT. So it makes since any crank prepped for a stocker would be indexed and ground .013 over factory specifications.

02-12-2021, 10:21 AM	#7
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 373 Times in 129 Posts	Re: Dumb question... +/- .015 on crankshaft As far the BBC crank stroke go they can vary quite a bit, lets take a 454 cast 039 crank for instances, the factory grind had a high of 4.010 and a low of 4.002, we indexed it and ground it to 4.010. We just did a steel 454 7416 that came in at a low of 3.990, it was indexed and ground to 3.990. Just because its suppose to have a 4.00 stroke and be equal on all four pins, its NOT. So it makes since any crank prepped for a stocker would be indexed and ground .013 over factory specifications.