Big Block Intermediate Shaft size

[Cranky]

I have a few shafts on the shelf and one is what's advertised on Ebay etc as fitting all the big blocks. Overall length is 7.940 and that's about what one of mine are with a length from the bushing seat to the tip being 6.400 +or- I also have another one that looks just like this one except it's 8.510 overall and 6.980 bushing seat to tip. Gear pitch is the same on both. It's been a very long since I built any low decks but was under the impression that the intermediate shafts were different but why would the be? I have another that's even longer but the gear pitch is opposite and the top of the gear is flat. I have no idea what that one is for. I guess what I'm asking is what do these fit. Been 10+ years since I built any engine and CRS/OTD is setting in

 

[Cranky]

Thinking about it, the longest one is for a small block. I've only built a couple of them things and that was better than 25 years ago and was thinking they were shorter but why would they be.....

 

[lewtot184]

the long one may be for a dual pick-up milidon. they use an A engine shaft (which is longer than a big block) with a big block gear.

 

[moparwacko]

Big block all use the same length as far as I remember...... there are different ones for roller cams, etc.
The last one sounds like a small block.

 

[PRND21]

Small blocks have an opposite pitch with a flat top. Don't know the length of the shaft.

 

[beanhead]

Here's the one out of my 440...looks like the tape moved a smidge but it's a hair less than 8"

 

[Cranky]

Thanks for the info! I did get an engine to rebuild for someone many years ago that was built as a race engine and iirc, it had the Milodon pan and pump so maybe that's where the 8.510 shaft came from. The guy wasn't interested in it being a race motor and wanted it built for the street....man....the memory banks can't keep it all sorted out.

 

[lewtot184]

if it has the correct big block gear then it's probably for a dual line milidon.

 

[Cranky]

if it has the correct big block gear then it's probably for a dual line milidon.

Yup...same rotation and same style but just a different length shaft.