I take it all 455 crankshaft were drilled for rhe bushing at the rear for a manual transmission? All? And what is the size of the outside diameter of the bushing?
I remember reading somewhere on the board that they were not all cut for the bushing. I thought TA sold the bushing.
Not all 455 crankshafts are bored out to accept a bushing. Out of the dozen or so that I have, I would guess only four or five are. I could look if someone is really interested, but that sample size probably doesn’t represent the real percentage out of the millions produced.
Good discussion here: https://www.v8buick.com/index.php?threads/pilot-bushing-saga.322757/ and https://www.v8buick.com/index.php?threads/wrong-or-right-pilot-bushing.116828/ According to JW, if a BBB crank was not machined for a bushing, the crank IDs are all over the place. If that's the case, cut the crank OD larger to spec or machine the bushing OD smaller to work w/existing crank ID. Specific diameters are mentioned in the discussions, note recommended interference fit .0002" to .0005" mentioned by JW. Here's detail on a bushing from Summit Racing: https://www.summitracing.com/parts/ntl-pb656hd/make/buick/model/gs-455/year/1970#overview Brand: National Bearings and Seals Manufacturer's Part Number: NNTPB656HD Part Type: Pilot Bearings and Bushings Product Line: National Bearing Pilot Bearings Summit Racing Part Number: NTL-PB656HD UPC: 724956022137 Pilot Bushing Type: Solid Pilot Bushing Material: Brass Outer Diameter (in.): 1.094 in. Inside Diameter (in.): 0.594 in. Width (in.): 0.750 in. Devon
Guess I got really lucky, I have a Buick 455 lunati 10-10 crankshaft, never seen one since I bought this one years ago!
nope, not really... the only reliably correctly size 400/430/455 cranks, in regard to the pilot bearing hole, are the original stick shift cranks. Every other crank is an unknown, until you break the tools out and measure it. Not uncommon for there to be two sizes in that hole, with a step between the two. JW
I'm I reading this right? Are the casting numbers showing if it a 400, 430, 455 Buick, or even if it's an Oldsmobile or a Pontiac crankshaft? I did not see any ID or casting numbers on line. I hope I have a Buick crankshaft.
Al, no you're not reading it right. All the 4oo/430/455 crankshafts are the same as cast. So, a casting number won't tell you about whether or not a particular piece was used for a manual transmission or not. That's because a casting number is exactly that...cast into the crankshaft during it's processing at the foundry. After the casting though, machine work was done to make it into a usable piece. A part of that was what's called a "secondary" process to make the crankshaft usable for a manual transmission. It involved making that small spot at the rear acceptable for a bushing. What we're trying to tell you is that there's no way to know what you have, unless you have a crankshaft that came out of a production Big Block Buick manual trans car. If you don't know the true origin of the crankshaft, then it's time to start measuring what you have, to KNOW what you have. Devon
And you said you have a "Lunati" crankshaft? I've never known them to supply a Buick 400/430/455 crank. But not saying they didn't. Time for more pictures, please. Devon
Lunati was not involved with Buick that I know of, maybe re-boxed. I understand the part about the pilot hole. I just thought there was a way of knowing more about the crankshaft, more pictures coming.
And sorry, still racking my brain and not remembering the casting number for 400/430/455 crankshafts, I'm thinking there isn't one. They're all the same. Devon