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#26 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Do I need to bore over 30 to put in pistons?
Quote:
It all starts with a bore measurement - the bore determines what your options are. Once the largest bore size is known, then you know what your options are. Sometimes the inline 6's show little or no bore wear even after 100's of thousands of miles. |
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#27 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Do I need to bore over 30 to put in pistons?
Quote:
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#28 |
Registered User
Join Date: Nov 2006
Location: Alabama
Posts: 120
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Re: Do I need to bore over 30 to put in pistons?
Thanks fellas,
For some reason I was leary of having it bored. I'll just ask around and take it to the most respected shop around here (when I get it out) , and go with a min bore. Thanks again. |
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#29 | |
GEARHEAD
Join Date: Jan 2007
Location: CENTRAL,PA
Posts: 2,284
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Re: Do I need to bore over 30 to put in pistons?
Quote:
RJ22 |
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#30 | |
Senior Member
Join Date: Mar 2007
Location: VANCOUVER ISLAND, B.C., Canada
Posts: 1,602
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Re: Do I need to bore over 30 to put in pistons?
Quote:
First off If it were my 350 cu. I would only go through this if I was restoring a truck and this were my original engine. If this were the case I would be more concerned about decking the block as in most cases this has neg. effects on the #s. Less meat more chances of failure. That's what machine shops have told me .... maybe I'm just afraid of all the power that is going to result by the 60 over bore! Or maybe I do not like to take chances of taking things to the max and having a melt down. Now you being of a different opinion I can respect. That's the beauty of this hobby of ours. We all get to do our own thing. esll. ![]()
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Tomorrow is for doing today's stuff. ![]() ************************************* This truck has just the right amount of energy for me! ![]() Author: Warren Lake .... (member) Last edited by EAST SIDE LOW LIFE; 04-28-2007 at 05:16 AM. |
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#31 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,285
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Re: Do I need to bore over 30 to put in pistons?
I've got Badger pistons in my 292. My machinist set me up with them. They are cast pistons. If you want forged pistons you have to go to Arias or Ross, but they're spendy. You might get a line on them at www.inliners.org.
TRW doesn't make them anymore.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 04-28-2007 at 06:27 AM. |
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#32 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Do I need to bore over 30 to put in pistons?
Quote:
The only reason to bore an engine IMHO is to establish the correct piston/bore clearance and ensure a square bore (i.e., no taper). The CID increase on a stock block (not the aftermarket ones that you can bore out huge) is minimal. If you can buy a piston and establish a reasonable clearance, square bore and the right surface with a hone, go for it. |
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#33 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Do I need to bore over 30 to put in pistons?
I would go minimal overbore as suggested.The first thing though is to determine what you can get in the way of pistons without going custom.The options may be limited and could play a part in your decision.Since the 250 hasn't been built in many years there may not be as many choices since the demand has dropped.I also agree on a better cam,the cam reps will be able to help you more on that,make sure to have as many of the specs to give them as possible.Use good qulity head gaskets since the standard compression ratio is about 8.00:1 and the new will be higher.You may also need to run a better grade of fuel(higher octane)since compression will be higher.Since you are going to a 4 barrel you will want a better exhaust also maybe headers or a split manifold.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 04-28-2007 at 04:18 PM. |
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#34 | |
Senior Member
Join Date: Mar 2007
Location: VANCOUVER ISLAND, B.C., Canada
Posts: 1,602
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Re: Do I need to bore over 30 to put in pistons?
Quote:
Was I being serious .... ![]() esll. I've done rebuilds On very expensive # correct engines and the school of thought that I come from is to error is human .... when there is NO' second chance I have always have chosen to error on the side of caution. Old habbits are hard to break. Yet to blow something up or have something that does not work right when it's finished ..... at this point one should not be scratching their head .... what the heck went wrong??? Know what I mean!
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Tomorrow is for doing today's stuff. ![]() ************************************* This truck has just the right amount of energy for me! ![]() Author: Warren Lake .... (member) |
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