| 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
Karma:
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Senior Member |
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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.
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