[crazypont]

I have a few sets of H beam 6.625 Rods that I had made up for just this instance. Saving old cranks that need to go BBC size on the rod journals. It has been hard to got .040 bearings for 20 years. These work on a .050 under crank. 6.625 long, .980 bushed pin end, can hone to .990 if need be. ARP 8740 1.800 long bolts x 7/16. Finished machined in House.

[PAUL K]

Originally Posted by Tom Vaught

Barney Moravitz, and later Jim Butler, had a bunch of Pontiac Cranks done that way. Course this was 30+ years ago

Tom V.

Hi Tom, yes that was long ago. Butler along with Nunzi would get their chrome cranks from Crankshaft Specialties. I recall Doug Rowe telling me they would ship pallets by rail car to get them to Nunzi. Butler was close enough that transportation wasn't a big deal. They worked thirty years ago and still today. Doug offered a good program, the cranks would be wet magged, inspected, de'burred, hard chromed and shot peened. The specs were always consistent and spot on.

Recently Butler had a deal with Lunati offering a similar service but the cranks would be tufftrided rather than hard chromed. Pretty sure that deal fell apart when Lunati changed ownership again.

[steve25]

So no one has any concerns with hard chroming a cast Crank and the effect that Hydrogen embrittlement has on it, i'am stunded!

[PAUL K]

Originally Posted by steve25

So no one has any concerns with hard chroming a cast Crank and the effect that Hydrogen embrittlement has on it, i'am stunded!

Just you and Jim Taylor (RIP)

[67Fbird]

sooo...not trying to hijack...
just got my 455 apart....3 spin rod bearings...

Has anyone FOUND .040 rod bearings. After measuing I will need either 030 or maybe 040 on the rods?
Everybody is at Norwalk currently so..can't actually talk to anyone that MIGHT have them?

[steve25]

I would call a crank grinding shop in your area and ask them to check with there supplier.

[Joe's Garage]

Rockauto shows .040 under CB758P Mahle/Clevite bearings for $9.40 each plus shipping. They also show a set of eight for $70.79.

https://www.rockauto.com/en/catalog/...d+bearing,5212

Make sure you grab a discount code to save 5%.

Good luck!

Originally Posted by 67Fbird

sooo...not trying to hijack...
just got my 455 apart....3 spin rod bearings...

Has anyone FOUND .040 rod bearings. After measuing I will need either 030 or maybe 040 on the rods?
Everybody is at Norwalk currently so..can't actually talk to anyone that MIGHT have them?

[John Milner]

I found one company on eBay that has some .040 under Clevite rod bearings in stock for a Pontiac.

[Joe's Garage]

Originally Posted by John Milner

What is everyone’s opinion on running a crankshaft that has been cut .040 on the rods? My N crankshaft is a little rough and the crank grinder thinks it will take .030 or .040 to clean it up. I’ve always ran std or no more than .020 under on the rods. .040 sure seems like a lot. The engine is a 68 WS 400 and will likely never see over 5,500 rpm and not be over 400 horsepower.

https://www.rockauto.com/en/catalog/...d+bearing,5212

Currently shows (23) singles available or (2) sets of eight. So, maybe, (39) pcs total.

[67Fbird]

didn't even consider "regular" sources...lol
thanks

[chiphead]

I ran a 400 N crank for years turned down .050" to fit the BBC 2.20" rod journals. Pinched a ring and beat the rod bearings on a small shot, but no issues with that crank. Go with a set of BBC rods, there are a ton of rod insert choices for those engines. The challenge is finding a competent crank grinder that can turn the journals down and cut the proper shoulder radii.