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#1 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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350 block with 060 over bore
As the title says I have a pair of 350 blocks that came into my garage already bored 060 over. Every Chevy book says that a service limit on Gen 1 350 is 60 mills max overbore. Even at 60 mills over the cylinder wall thickness can be dicey depending on a casting. Before I load these spent blocks and take them to recycling yard I wonder if anyone have tried to re-hone and re-ring a 60 over block. I know it is not worth the effort, but I am just curious what one can get away with a bind.
//RF
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"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) ![]() New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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#2 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: 350 block with 060 over bore
sleeves ?
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#3 |
Account Suspended
Join Date: Jul 2007
Location: Plumas Lake, Ca.
Posts: 1,009
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Re: 350 block with 060 over bore
If the cylinders are round with no ridge at the top they should be able to be honed with no problems... Are they just bare blocks or do they have pistons, crank etc?
If complete, you basically would do a ring and bearing job and have a fresh motor although one that is at the end of its life. Its probably cheaper to buy a block now than to sleeve what you have. |
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#4 | |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: 350 block with 060 over bore
Quote:
Second engine has cast, dish style pistons and re-using them with large smog style heads (72 to 75cc) will result in low compression 7.5-8.0:1. Even later 64cc heads will increase compression to about 8.9:1. I am only guessing at the size of the dish. Condition of bearings is unknown. The ridge (in both) is very small, barely noticeable. I have heard of 080 pistons, but I have never tried them before on any of my builds. I think both engines had less than 25-30K since rebuild (what a shame). Sleeving is too expensive and in the end finding a untouched core is better and cheaper approach. Thank you for feedback. //RF
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"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) ![]() New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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#5 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: 350 block with 060 over bore
Scrap prices are up. Send em to the yard. Theres too many good 350 blocks around everywhere to bother messing with something that is .060 over. Usually at .060 over if they were sonic checked they would be too thin for service. I couldnt even imagine trying to go .080 over. Besides that the old blocks are a thing of the past. The junkyards are full of the 87-95 throttle body engines. The blocks are already roller cam capable. They wear extremely well and have a 1 piece rear main which leaks a lot less.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#6 |
Registered User
Join Date: Apr 2010
Location: Kalifonia
Posts: 265
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Re: 350 block with 060 over bore
They do make .080 over . just not my cup of tea...
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1969 Chevy C10 Shortbox SB/TH350(SOLD) 1971 GMC Sierra Grande BBC(SOLD) 1972 Chevy C20 Longbed SBC/4Speed(Sold) 1972 Chevy C10 LWB-SWB/Bagged(ALMOST) 1972 Chevy C10 Shortened/SBC(DONE) 1981 Chevy C10 SWB 383/TH350(SOLD) |
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#7 |
Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: 350 block with 060 over bore
Just IMO but 60 is already beyond useable!. But..... If the one can be honed , re-ringed and put back together as a low compression / low power 'somebody needs a motor CHEEP!!!",, why not!!!, If it takes ANY work at all to get the bores in shape,, I'd call it scrap. 4" cores are too plentiful and cheap to waste $'s on anything but a bare-bones $500 rebuild. I won't use anything past +.040 myself in a stock block.
(edit,, danggit,, Cableguy treed me again ![]()
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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#8 |
Registered User
![]() Join Date: Jun 2006
Location: Maple Valley, WA
Posts: 1,913
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Re: 350 block with 060 over bore
Adding Hardblock can be done but it reduces cooling capacity, so yes junk them both.
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#9 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: 350 block with 060 over bore
Looks like majority agrees that long term reliability is very questionable for a 60+ over block.
![]() OK - I'll call my local JY's see what they pay for scrap iron. The only plus from all of this is that now I have multiple sets of heads, push rods, con rods, oil pumps, cranks, oil filter adapters, etc which could be potentially re-used. //RF
__________________
"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) ![]() New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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060 overbore, 350, hone |
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