| [GMCnet] 403 Crankshaft Needed [message #323417] |
Tue, 05 September 2017 19:11  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Another parts request: Does anyone one have, or know a source for, a 403
crankshaft. Local engine builder John Beaver wants to build a standby
403. He has a core from a recent rebuild, but #7&8 rod bearings spun and
#1&2 were about to. He doesn't want to build an engine with undersized
journals, so he needs a good crankshaft.
That's not a problem with 455's since NEW crankshafts are available (like
in Rick Denny's new engine); but, AFAIK, no new 403 cranks yet. I THINK
the Olds 350 crank is the same as that for the 403, but need authoritative
confirmation of that.
Let me know & I'll pass the word to non-internet-active John B.
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] 403 Crankshaft Needed [message #323423 is a reply to message #323417] |
Tue, 05 September 2017 20:57  |
Kosier
Messages: 834
Registered: February 2008
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Ken,
The 403 is a part # all on its own. While the dimensions are all probably
the same, the 403 has a slightly heftier connecting rod an a much heavier
piston by virtue of it's larger diameter. So the balance would be
different.
John could probably rebalance the 350 crank, but that adds to the expense.
Now I'm looking in the 76-81 parts book(the last printed book) and they
list 3 different cranks for a 350 gas engine. I didn't root long enough to
find out the difference.
Gary Kosier
77 PB w/500 Cad
Newark, Ohio
--------------------------------------------------
From: "Ken Henderson"
Sent: Tuesday, September 05, 2017 8:11 PM
To: "GMC Mail List"
Subject: [GMCnet] 403 Crankshaft Needed
> Another parts request: Does anyone one have, or know a source for, a 403
> crankshaft. Local engine builder John Beaver wants to build a standby
> 403. He has a core from a recent rebuild, but #7&8 rod bearings spun and
> #1&2 were about to. He doesn't want to build an engine with undersized
> journals, so he needs a good crankshaft.
>
> That's not a problem with 455's since NEW crankshafts are available (like
> in Rick Denny's new engine); but, AFAIK, no new 403 cranks yet. I THINK
> the Olds 350 crank is the same as that for the 403, but need authoritative
> confirmation of that.
>
> Let me know & I'll pass the word to non-internet-active John B.
>
> Ken H.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] 403 Crankshaft Needed [message #323426 is a reply to message #323423] |
Tue, 05 September 2017 21:03 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Yeah, I've found several references to 403 & 350 cranks of several
different casting numbers and one mention of at least a 200 gram difference
in the 403 & 350 pistons -- no mention of the rods. Another mention of
having to add heavier metal weights to the counterbalances. All-in-all,
too darned much trouble.
I think John's biggest objection to cranks turned at all is that the
bearings he prefers are only available in std. size. We'll have to talk
more.
Ken H.
On Tue, Sep 5, 2017 at 9:57 PM, Gary Kosier wrote:
> Ken,
>
> The 403 is a part # all on its own. While the dimensions are all probably
> the same, the 403 has a slightly heftier connecting rod an a much heavier
> piston by virtue of it's larger diameter. So the balance would be
> different.
> John could probably rebalance the 350 crank, but that adds to the expense.
> Now I'm looking in the 76-81 parts book(the last printed book) and they
> list 3 different cranks for a 350 gas engine. I didn't root long enough to
> find out the difference.
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "Ken Henderson"
> Sent: Tuesday, September 05, 2017 8:11 PM
> To: "GMC Mail List"
> Subject: [GMCnet] 403 Crankshaft Needed
>
> Another parts request: Does anyone one have, or know a source for, a 403
>> crankshaft. Local engine builder John Beaver wants to build a standby
>> 403. He has a core from a recent rebuild, but #7&8 rod bearings spun and
>> #1&2 were about to. He doesn't want to build an engine with undersized
>> journals, so he needs a good crankshaft.
>>
>> That's not a problem with 455's since NEW crankshafts are available (like
>> in Rick Denny's new engine); but, AFAIK, no new 403 cranks yet. I THINK
>> the Olds 350 crank is the same as that for the 403, but need authoritative
>> confirmation of that.
>>
>> Let me know & I'll pass the word to non-internet-active John B.
>>
>> Ken H.
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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