 gcrkfrd
"6th Year" Platinum Supporting Member
Posts: 497
Age: 76
Loc: Neosho, MO.
Reg: 04-01-18
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11-15-23 07:29 AM - Post#2864182
I have a 4 bolt 350, and a crank that came with it. Took it to be bored because of cylinder scratches. Got it back 30 over. Shop said the crank was not a truck crank, turned it 10 under. Ordered stock replacement cast pistons, One place, and stock replacement rods another. Managed to put pistons on rods, installed new mains and rod bearings. Put Number One, in block, and counter weights, on crank hit bottom of piston skirt while rotating, and piston comes up out of cylinder, about 1/8". What are your thoughts?
1952 Styleline Sedan-
Baby Blue 1967 C-20, Survivor.
T-Bucket, Small Blocks, and parts everywhere |
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Shepherd
Valued Contributor
Posts: 3186
Loc: Lake George, NY
Reg: 11-11-15
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11-15-23 07:57 AM - Post#2864186
In response to gcrkfrd
Sounds like wrong crank? What is the casting number? You could also measure the total stroke if you can get one revolution, but it sounds like that won't work.
Edited by Shepherd on 11-15-23 07:59 AM. Reason for edit: No reason given.
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 Magnetocheck
"2nd Year" Silver Supporting Member
Posts: 300
Age: 69
Loc: Charlotte, NC, USA
Reg: 09-05-22
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 11-15-23 08:35 AM - Post#2864190
In response to gcrkfrd
No such thing as a stupid question, only stupid answers! Keep us posted on your progress
Bob
'65 Impala SS 396 Convertible |
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Rick_L
Member #409
Posts: 28094
Loc: Katy, Tx, USA
Reg: 07-06-00
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11-15-23 10:36 AM - Post#2864193
In response to gcrkfrd
It's not the wrong crank, it's the wrong pistons.
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Shepherd
Valued Contributor
Posts: 3186
Loc: Lake George, NY
Reg: 11-11-15
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 11-15-23 12:07 PM - Post#2864197
In response to Rick_L
Could be, but the assumption is the machine shop would know better. :sad :
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Rick_L
Member #409
Posts: 28094
Loc: Katy, Tx, USA
Reg: 07-06-00
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11-15-23 06:22 PM - Post#2864203
In response to Shepherd
If the pistons stick out past the deck, either the pistons are for a smaller stroke than expected, or the crank has more stroke than expected.
Since the engine is said to be a 350, if 327 pistons were used they would stick out. But there is no factory crank that has more stroke that would actually fit in the block.
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gcrkfrd
"6th Year" Platinum Supporting Member
Posts: 497
Age: 76
Loc: Neosho, MO.
Reg: 04-01-18
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11-15-23 07:34 PM - Post#2864204
In response to Rick_L
I ordered another set of pistons, will try again next week. Thank you for your responses.
1952 Styleline Sedan-
Baby Blue 1967 C-20, Survivor.
T-Bucket, Small Blocks, and parts everywhere |
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Shepherd
Valued Contributor
Posts: 3186
Loc: Lake George, NY
Reg: 11-11-15
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11-16-23 06:03 AM - Post#2864206
In response to Rick_L
Agreed, but what crank is in there, no info to be sure. But, most likely it is the piston/ rod combo.
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japete92
Posts: 2189
Loc: No. Virginia
Reg: 01-18-13
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11-16-23 08:20 AM - Post#2864209
In response to Rick_L
If the pistons stick out past the deck, either the pistons are for a smaller stroke than expected, or the crank has more stroke than expected.
Since the engine is said to be a 350, if 327 pistons were used they would stick out. But there is no factory crank that has more stroke that would actually fit in the block.
Truely a question.
How about the 400 cu in sbc factory engine crank? 'Fit' the 350 block?
Pete
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Rick_L
Member #409
Posts: 28094
Loc: Katy, Tx, USA
Reg: 07-06-00
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11-16-23 10:16 AM - Post#2864215
In response to japete92
The main bearing journals on a 400 SBC crank are bigger than on a 350 crank.
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gcrkfrd
"6th Year" Platinum Supporting Member
Posts: 497
Age: 76
Loc: Neosho, MO.
Reg: 04-01-18
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11-16-23 11:44 AM - Post#2864220
In response to Rick_L
Machine shop only had block and crank, it appears that somewhere, in my ordering parts, I obtained 327 pistons 30 over. Crank casting #3932442
Fairly typical problem with our hobby-Order parts, they set there for weeks or months, maybe years then you find out too late, and have to order more parts, end up with a large inventory of possibly unknown pieces.
1952 Styleline Sedan-
Baby Blue 1967 C-20, Survivor.
T-Bucket, Small Blocks, and parts everywhere |
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Stinky
Senior Member
Posts: 1930
Loc: Whitewater, CO
Reg: 05-25-01
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11-17-23 10:08 AM - Post#2864240
In response to gcrkfrd
That is a 350 crank...and it looks like it is not a HD crank.
https://www.mortec.com/cranks.htm#google_vignette
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bobb
Super Senior Member
Posts: 6461
Loc: paradise
Reg: 09-05-03
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11-18-23 09:31 AM - Post#2864257
In response to gcrkfrd
uh, a good machine shop would want the pistons in hand to measure before bore and hone.
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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gcrkfrd
"6th Year" Platinum Supporting Member
Posts: 497
Age: 76
Loc: Neosho, MO.
Reg: 04-01-18
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11-28-23 09:38 AM - Post#2864569
In response to gcrkfrd
My question today-Is there anything wrong with using bushed rods and snap ring pistons and pins in the assembly of my street driven 350?
1952 Styleline Sedan-
Baby Blue 1967 C-20, Survivor.
T-Bucket, Small Blocks, and parts everywhere |
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Shepherd
Valued Contributor
Posts: 3186
Loc: Lake George, NY
Reg: 11-11-15
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11-28-23 02:15 PM - Post#2864579
In response to gcrkfrd
Not if it is done right.
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