machining 273 crank for later 904 converter

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65TerrorCuda

65TerrorCuda

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Alright, so I'm looking at getting my crankshaft pocket/register/etc. enlarged for the later easy-to-find converter. I've seen two sizes listed for the bore, both 1.81" and 1-13/16" or 1.8125". Can anybody verify this? How much clearance is there for the converter hub?

And for anyone who's worked on a crankshaft, how do you hold it without damaging the mains?

All help appreciated, I sure don't wanna junk this crankshaft due to some rookie mistake.
 
Not much help, but im removing 904 that has smaller hub converter. When I put 340 in, I had to have a spacer/bushing made. I can get dimensions once trans/converter is out.
 

4spdragtop said:
Not much help, but im removing 904 that has smaller hub converter. When I put 340 in, I had to have a spacer/bushing made. I can get dimensions once trans/converter is out.
Click to expand...
Much appreciated, but I'm trying to get away from the small hub. I've called 10+ torque converter places and I'm looking at minimum $850. I've got the opposite problem, later 904 with the 273. I should just go 340 and call it a day, I'm considering it.

RustyRatRod said:
I'm unsure the crank register is thick enough to do that.
Click to expand...
This is my concern too, but I asked another member that's done it himself multiple times and I guess it wasn't an issue. Every crank is different though, so I'll have to take a close look once it's sitting on the bench.

4spdragtop said:
Here's thread where I did the opposite, went from 340 crank to 273 converter. Might help?
Flex plate bolts witness marks on torque converter
Click to expand...
Hey thanks! That's a great reference for sure! I enjoyed that read.

My plan is to borrow a converter and take it with me when I get the crank machined.
 
65TerrorCuda said:
Alright, so I'm looking at getting my crankshaft pocket/register/etc. enlarged for the later easy-to-find converter. I've seen two sizes listed for the bore, both 1.81" and 1-13/16" or 1.8125". Can anybody verify this? How much clearance is there for the converter hub?

And for anyone who's worked on a crankshaft, how do you hold it without damaging the mains?

All help appreciated, I sure don't wanna junk this crankshaft due to some rookie mistake.
Click to expand...

RustyRatRod said:
I'm unsure the crank register is thick enough to do that.
Click to expand...
I had an early small block steel crank machined for the larger register. Cost $65 bucks 10 years ago.
 
Killer6 said:
What You are doing has been done, there are pics either here on FABO, or on the Slant Six Forum .org site. It works...
Click to expand...
I will give that a look here soon, thank you!

Illahe said:
I had an early small block steel crank machined for the larger register. Cost $65 bucks 10 years ago.
Click to expand...
Local shops have quoted 100-150 minimum for 1 hour. So long as it doesn't become a paper weight I'm happy with that.

Hope y'all are doing good,
 
65TerrorCuda said:
Much appreciated, but I'm trying to get away from the small hub. I've called 10+ torque converter places and I'm looking at minimum $850. I've got the opposite problem, later 904 with the 273. I should just go 340 and call it a day, I'm considering it.


This is my concern too, but I asked another member that's done it himself multiple times and I guess it wasn't an issue. Every crank is different though, so I'll have to take a close look once it's sitting on the bench.


Hey thanks! That's a great reference for sure! I enjoyed that read.

My plan is to borrow a converter and take it with me when I get the crank machined.
Click to expand...
You know what they say. Measure twice, cut once. But somehow I still always get it wrong.
 
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