Would a new 305 crank be ok in a 350 82 C/10 ?

"Meat Plow" <meat.DeleteThis@petitmorte.net> wrote in message
news:1rmetn.1lp.17.1@news.alt.net...
> On Mon, 05 May 2008 20:53:20 -0500, RCJesse wrote:
>
>> I bought the wrong crank for my 350 and installed it. The truck was sold
>> to
>> me as a 305 but then we discovered it was a 350 after the crank was
>> already
>> in with heads rods etc from the original 350. Would it need to be
>> balanced,
>> or would it work fine? Thanks.
>
> Did you compare the counter weights between the two cranks? My educated
> guess is the 305 crank is going to have less counterweight because the
> pistons are smaller. You'd probably be better off seeing if your 350 crank
> could be repaired.
>

The biggest issue if the rod and main journals are the same size is going
to be the stroke.
The next issue is going to be the harmonic balancer and the flywheel. Some
engines are internally balanced, and some are not. I would say if the
piston skirts clear the counter weights your ok but that also depends on the
piston design and cylinder head chambers. If she was a smog motor with
dished pistons and big chambers, ie low compression to begin with your in
trouble.
We swap cranks all the time in hot rods for various reasons, to create a
short stroke engine, to change a short stroke to a long stroke, or a long
stroke to an even longer stroke to increase displacment to the max.. All
trying to come up with different horsepower and torque configurations. Me I
always build light cars, like Vegas, so I go for short stroke engines that
rev fast. But we usuaully go with a longer rod when we go to a short stroke
crank, or we loss to much compression. I dont need massive horsepower and
torque to get a 2700 pound car motivated lol.
If nothing else you have learned a lesson the hard way, varify what you have
before buying internal parts. There are casting numbers on the back of the
block and numbers stamped into a pad on the front of the block that would
have told you what you have. On an older vehicle never trust the vin number,
it was right when it left the factory, but who knows what was done since.

Whitelightning
 >> Stay informed about: Would a new 305 crank be ok in a 350 82 C/10 ? 

On May 5, 9:53 pm, "RCJesse" <rcjess... DeleteThis @grandecom.net> wrote:
> I bought the wrong crank for my 350 and installed it. The truck was sold to
> me as a 305 but then we discovered it was a 350 after the crank was already
> in with heads rods etc from the original 350. Would it need to be balanced,
> or would it work fine? Thanks.

I thought the 305 and 350 had the same stroke and interchangeable
cranks, but Autozone shows different part numbers for each. Something
is different. Only $224 for a crank kit. Not worth the gamble, in my
opinion.
 >> Stay informed about: Would a new 305 crank be ok in a 350 82 C/10 ? 

The Reverend Natural Light wrote:
> On May 5, 9:53 pm, "RCJesse" <rcjess... RemoveThis @grandecom.net> wrote:
>> I bought the wrong crank for my 350 and installed it. The truck was sold to
>> me as a 305 but then we discovered it was a 350 after the crank was already
>> in with heads rods etc from the original 350. Would it need to be balanced,
>> or would it work fine? Thanks.
>
> I thought the 305 and 350 had the same stroke and interchangeable
> cranks, but Autozone shows different part numbers for each. Something
> is different. Only $224 for a crank kit. Not worth the gamble, in my
> opinion.
>

267,305 and 350 all use the same crank. The different part numbers are
likely for the steel or iron cranks.

--
Steve W.
 >> Stay informed about: Would a new 305 crank be ok in a 350 82 C/10 ? 

On Wed, 07 May 2008 23:15:09 -0400, Steve W. wrote:

> The Reverend Natural Light wrote:
>> On May 5, 9:53 pm, "RCJesse" <rcjess....DeleteThis@grandecom.net> wrote:
>>> I bought the wrong crank for my 350 and installed it. The truck was
>>> sold to me as a 305 but then we discovered it was a 350 after the
>>> crank was already in with heads rods etc from the original 350. Would
>>> it need to be balanced, or would it work fine? Thanks.
>>
>> I thought the 305 and 350 had the same stroke and interchangeable
>> cranks, but Autozone shows different part numbers for each. Something
>> is different. Only $224 for a crank kit. Not worth the gamble, in my
>> opinion.
>>
>>
> 267,305 and 350 all use the same crank. The different part numbers are
> likely for the steel or iron cranks.

Same stroke, different counterweights because of the differing size/
weights of pistons. Will shake like a dog sh**ing razor blades unless it
is re-balanced.
 >> Stay informed about: Would a new 305 crank be ok in a 350 82 C/10 ?