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Advice on buying a machined bare block
#1805936
04/17/15 11:08 PM
04/17/15 11:08 PM
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Joined: Oct 2004
Posts: 1,074 So Cal, USA
Fab64
OP
super stock
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OP
super stock
Joined: Oct 2004
Posts: 1,074
So Cal, USA
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Hi all,
I have a chance to buy a 440 block which has already been bored & honed, using a torque plate, .030 over, square decked and hot tanked. I have heard it said that before boring a block, the machinist should already have the pistons that are going to be used, so they can be more precisely matched. How important is this? Would I be making a big mistake to buy such a block, then buy the pistons separate? As always, thanks for all replies & opinions.
Roger
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Re: Advice on buying a machined bare block
[Re: Fab64]
#1805973
04/17/15 11:52 PM
04/17/15 11:52 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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No way to be sure if it was honed for cast or hypers or forged (I would assume with that good of work either #2 or #3). Anyway you could find out what pistons it WAS sized for? A person could have a shop mike it & I would call one or more of your local machine shops & pick their brains on this one. Never ran into this before! Here's a BTT for ya
live every 24 hour block of time like it's your last day on earth
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Re: Advice on buying a machined bare block
[Re: RapidRobert]
#1806014
04/18/15 01:19 AM
04/18/15 01:19 AM
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Joined: Oct 2004
Posts: 1,074 So Cal, USA
Fab64
OP
super stock
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OP
super stock
Joined: Oct 2004
Posts: 1,074
So Cal, USA
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No way to be sure if it was honed for cast or hypers or forged (I would assume with that good of work either #2 or #3). Anyway you could find out what pistons it WAS sized for? A person could have a shop mike it & I would call one or more of your local machine shops & pick their brains on this one. Never ran into this before! Here's a BTT for ya Thanks, Robert - that (piston type) makes perfect sense. I'll try to see what more I can find out.
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Re: Advice on buying a machined bare block
[Re: moparx]
#1806285
04/18/15 02:30 PM
04/18/15 02:30 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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After what the 2 prior guys said I'm gettin a bit scared myself, cuz what dimention did they run into that made them have to abort the project (sonic test) and or how did the pistons it was bored/honed for manage to dissappear. Holler how it turns out
live every 24 hour block of time like it's your last day on earth
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Re: Advice on buying a machined bare block
[Re: RapidRobert]
#1806374
04/18/15 05:35 PM
04/18/15 05:35 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Bored and honed? Hmmm
As said, hyper, cast, forged... They expand differently and require different piston to bore clearances. What grit honed? Different ring material will require different hone grit on the cross hatch.
No matter what you do, you will likely be looking at additional machine work once you choose Pistons/rings
**Photobucket sucks**
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Re: Advice on buying a machined bare block
[Re: 70Cuda383]
#1806499
04/18/15 09:43 PM
04/18/15 09:43 PM
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Joined: Oct 2004
Posts: 1,074 So Cal, USA
Fab64
OP
super stock
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OP
super stock
Joined: Oct 2004
Posts: 1,074
So Cal, USA
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Thanks guys, I appreciate the input. I'm going to back off on this, as I'm a bit leery as to why they're letting it go so cheap ($500). As you said, too many unknowns. I'll keep looking. Roger
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