If you go to a big pilot crank and converter, you also have to change the input shaft and pump in the trans.
But then, if you're gonna build a stroker, you'll want the big input in the trans anyway.
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| Crank selection -pre 68 or 68-75 https://www.slantsix.org/forum/viewtopic.php?t=18994 |
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| Author: | Bren67Cuda904 [ Thu Aug 03, 2006 9:38 am ] |
| Post subject: | Crank selection -pre 68 or 68-75 |
I ve been told that the 68-75 cranks are better in terms of aftermarket parts availablity. Mainly a higher stall converter. I now have a 64 crank. Would it be worth it to find and use a later crank or are there lots of converter available for both? |
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| Author: | SlantSixDan [ Thu Aug 03, 2006 10:47 am ] |
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Off-the-shelf converter selection is definitely much wider for the '68-up cranks with the large counterbore. Custom converters can be made with the small nose, but that's more costly. You can always just have your '64 crank's counterbore machined to the larger dimension, saving you from having to buy a different crank. |
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| Author: | slantzilla [ Thu Aug 03, 2006 12:10 pm ] |
| Post subject: | |
If you go to a big pilot crank and converter, you also have to change the input shaft and pump in the trans. But then, if you're gonna build a stroker, you'll want the big input in the trans anyway.
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| Author: | Bren67Cuda904 [ Thu Aug 03, 2006 1:55 pm ] |
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So there is enough meat in the crank to turn it? The larger input shaft is needed for the more common converters? Will this larger input shaft fit right in to a 1964 904A trans? If I decide to turn the crank and I still go back to the stock converter and smaller input shaft with a ring adaptor in the crank? Whats involved in changing the input shaft besides finding one? I plan on having the trans freshened up. Is this something that should not cost anymore to have done if done at that time? |
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| Author: | Bren67Cuda904 [ Thu Aug 03, 2006 2:15 pm ] |
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What a custom converter cost? |
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| Author: | SlantSixDan [ Thu Aug 03, 2006 2:33 pm ] |
| Post subject: | |
Quote: So there is enough meat in the crank to turn it?
YesQuote: The larger input shaft is needed for the more common converters?
YesQuote: Will this larger input shaft fit right in to a 1964 904A trans?
I forget how far back into the trans you have to go in order to swap in the big input shaft. Might be some front pump components that need to be changed. The go-to guy for correct info is Pat Blais, tflitepatty@verizon.netQuote: If I decide to turn the crank and I still go back to the stock converter and smaller input shaft with a ring adaptor in the crank?
Yes, correct, Pat Blais can supply.
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| Author: | slantzilla [ Thu Aug 03, 2006 3:30 pm ] |
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Quote: What a custom converter cost?
I've bought 2 custom built converters from Midwest, both for the large input stuff. The 10" 3500 stall was $300 and change, and the good 8" was a touch over $700. It is a trans barake/nitrous unit though.One like you want would be closer to the $300 scale.
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| Author: | Bren67Cuda904 [ Thu Aug 03, 2006 8:11 pm ] |
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I am wondering if this getting and changing the input shaft would cost about the same as the custom converter. |
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| Author: | sandy in BC [ Thu Aug 03, 2006 8:35 pm ] |
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My experience with early cranks(somewhat limited) has been that they weigh way more than later cranks....I have a 65 crank that is 88lbs. It will just about stroke itself if spun fast enough. It never broke tho.... |
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| Author: | Bren67Cuda904 [ Fri Aug 04, 2006 4:31 am ] |
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I likely need the bigger input shaft anyway. Forgot that even after just discussing it. |
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