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Author Topic:   Cylinder bore question?
thumpin cat
Gearhead

Posts: 260
From:
Registered: Mar 2002

posted 03-01-2003 03:23 PM     Click Here to See the Profile for thumpin cat     Edit/Delete Message   Reply w/Quote
If my 69 351w is standard bore and the cylinder walls seem ok, do i still have to bore the cylinders over?

please let me know thanks a lot

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D&S Induction Systems
Gearhead

Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003

posted 03-01-2003 04:47 PM     Click Here to See the Profile for D&S Induction Systems   Click Here to Email D&S Induction Systems     Edit/Delete Message   Reply w/Quote
I'd not only not bore it out, I'd use the old gaskets...

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CAPTAIN CLAMHEAD
Journeyman

Posts: 50
From: DETROIT MI
Registered: Feb 2003

posted 03-02-2003 03:15 AM     Click Here to See the Profile for CAPTAIN CLAMHEAD     Edit/Delete Message   Reply w/Quote
YOU SHOULD ALWAYS BORE YOUR CYLINDERS ROUND.

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IF I DON'T KNOW WHAT'S WRONG WITH IT NOBODY DOES.
GIVE ME A TEST, I'M SIMPLY THE BEST!

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68F100
Gearhead

Posts: 2062
From: Fort Madison, Iowa USA - United We Stand
Registered: Oct 99

posted 03-02-2003 04:30 AM     Click Here to See the Profile for 68F100   Click Here to Email 68F100     Edit/Delete Message   Reply w/Quote
OK...maybe I'm overly sensitive, but there is a difference in being a smartass and being a dumbass.

Personally, I'm sick of hearing a$$holes spout off their bull**** advice.

I'm very far from being an expert on anything automotive, but I can smell bull**** a mile away.

thumpin cat - someone will give you some real advice soon. Sorry I couldn't be of any help.

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bluestreek
Gearhead

Posts: 1289
From: Athens,GA
Registered: Jul 2001

posted 03-02-2003 09:39 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
A reputable engine machine shop should be able to tell you if it's OK to rehone the block or if it needs boring. Either way, get it done by a professional. A poor hone job won't last long.

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1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 03-02-2003 09:53 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by CAPTAIN CLAMHEAD:
YOU SHOULD ALWAYS BORE YOUR CYLINDERS ROUND.


Yeah, those triangular cylinders are tuff to find rings for.

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 03-02-2003 10:42 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
LOL

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Alex Denysenko
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The Barry of BarrysGrrl

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cpmaverick
Moderator

Posts: 1564
From: Auburn, AL.
Registered: Jan 2000

posted 03-02-2003 12:44 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Keep 'em standard if you can. Lots of so-called 'performance experts' talk about 'punching 30 over' but you are not really gaining anything, just a couple CI. A standard block will still be good for another rebuild later in life.

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-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 03-02-2003 12:59 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by cpmaverick:
Keep 'em standard if you can. Lots of so-called 'performance experts' talk about 'punching 30 over' but you are not really gaining anything, just a couple CI. A standard block will still be good for another rebuild later in life.


Charlie you are 100% absolutly WRONG buddy!

It has nothing to do with the increase in displacment. That's just a bonus. It's about making the bores round and straight. Making certain they are exactly 90 degrees perpendicular to the centerline of the crankshaft and having the smoothest possible finish on the walls. OEM factory machining is so bad and the tolerances are so far off that a standard bore OEM block will probably gain 20 HP with just a good hone job and a new set of rings. The factories just don't spend the money.
Ever wonder why Ferrari's were always so fast with only 2.5 liters in the 60's?


------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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D&S Induction Systems
Gearhead

Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003

posted 03-02-2003 02:38 PM     Click Here to See the Profile for D&S Induction Systems   Click Here to Email D&S Induction Systems     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Charlie you are 100% absolutly WRONG buddy!

It has nothing to do with the increase in displacment. That's just a bonus. It's about making the bores round and straight. Making certain they are exactly 90 degrees perpendicular to the centerline of the crankshaft and having the smoothest possible finish on the walls. OEM factory machining is so bad and the tolerances are so far off that a standard bore OEM block will probably gain 20 HP with just a good hone job and a new set of rings. The factories just don't spend the money.
Ever wonder why Ferrari's were always so fast with only 2.5 liters in the 60's?



Yes, Moneymaker is 100% correct here! You wouldn't beleive how BAD OEM tolerances are.

Sorry if I pissed anyone off here. I thought this was another joke thread.

YES, thumpin cat. If you are going to rebuild you're engine you should have it bored and honed out. And if you realy want to do a good job, also have the block decked and the mains align-honed. I've said it before and I'll say it agen. All that performance stuff means crap with out good machine work.

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