Brought to you in part by:

M&M Restoration & Tool Supply Store

Great deals on auto restoration supplies!

.


NOTICE! The old Mustangsandmore.com is a read-only archive.
Currently the Search function is inoperative, but we are working on the problem.

Please join us at our NEW Mustangsandmore.com forums located at this location.
Please notice this is a brand new message board, and you must re-register to gain access.

  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  Maximum Bore size on a 302

Post New Topic  Post A Reply
profile | register | preferences | faq | search

next newest topic | next oldest topic
Author Topic:   Maximum Bore size on a 302
Pierre
Gearhead

Posts: 661
From: Near Paris, France
Registered: Apr 2002

posted 06-06-2002 04:03 PM     Click Here to See the Profile for Pierre        Reply w/Quote
Out of curiousity, I have a 302 (Mexican block). It is presently bored 0.030
What's the maximum bore size for this engine ?

Never found the worm by the way !

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 06-06-2002 04:22 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
You can safely go .060 over Pierre. We are .070 over on our 5.0 HO blocks.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

Pierre
Gearhead

Posts: 661
From: Near Paris, France
Registered: Apr 2002

posted 06-06-2002 04:34 PM     Click Here to See the Profile for Pierre        Reply w/Quote
I guess my engine has a spare life

fastcomet289
Gearhead

Posts: 140
From: ventura ca
Registered: Feb 2002

posted 06-06-2002 06:23 PM     Click Here to See the Profile for fastcomet289        Reply w/Quote
i know that you engine halls butt, but what kind/ how often is the maintence, and engine life with .70 over? just wondering

------------------
1970 mach1 351c
1965 comet 289
http://mustangsandmore.50megs.com/fastcomet289.html

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 06-07-2002 12:37 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
300+ runs in 3 seasons and counting since 1999. Rings and bearings every year with a light hone.
Thank you Royal Purple

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

n2oMike
Gearhead

Posts: 3058
From: Spencer, WV
Registered: Jan 2001

posted 06-07-2002 10:25 AM     Click Here to See the Profile for n2oMike        Reply w/Quote
Shouldn't an engine be sonic checked for cylinder thickness before boring it that far?

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 06-07-2002 11:14 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
The only sonic I ever do it the drive through kind. The OEM blocks are cast with rebuilding in mind. They are all (except for the real late modular and itty bitty stuff)cast to withstand an .060 overbore. Do you really think that ALL of the traditional aftermarket piston manufacturers would tool up and offer .060 pistons if there was no market for them? Of course not. The last time I sonic tested a block all that I found out was that I spent a lot of money for nothing. I saw what I already knew, that certain bores were off more than others and there was a bit less material towards the center than the ends. Yeah, I used to fall for all of that sci-fi sh*t too Mike, but I learned a long time ago that a good pair of eyes and common scense goes a long long way. If the block is not thick enough to go .060 you don't want it at ANY overbore. That is the common scense aspect. Of all the several hundred 289-302-351 W blocks I have bored, I have only found one that was soooo bad that it was not acceptable. It was and 80 or 81 vintage 302 and that was from FoMoCo's darkest manufacturing era. Those two years produced some real junk. Both V-8's and six cylinders. Rememebr all of the piston slapping 4.9 300 truck engines? We knew going in that it had a bunch of core shift, but we tryed it anyway. It was cheaper to start boring it than the sonic testing proceedure.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

n2oMike
Gearhead

Posts: 3058
From: Spencer, WV
Registered: Jan 2001

posted 06-07-2002 02:22 PM     Click Here to See the Profile for n2oMike        Reply w/Quote
I hang out a little at the FE ford forum, and there are a lot of paranoid people out there when it comes to boring 427's and 428's. One even mentioned a 0.062" thick standard bore 351C cylinder... and they don't like to bore 427's out much at all.

I'm glad to hear that 289-351W's seem to fare a little better in the cylinder wall department.

Are you using block filler on those blocks that are getting bores 0.070" over? If not, I would think, the thicker the cylinder wall, the better the ring seal...

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

[This message has been edited by n2oMike (edited 06-07-2002).]

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 06-07-2002 03:27 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
MIke, if it is not a bread and butter street stocker rebuild, I always use Hard BLock filler. Whether it's a .030 or .070 overbore, makes no difference. The bore always stays square and round, plus the ring seal is phenominal.
Between the good lubrication and the round bores,is what I attribute our block longevity to. The FE guys have always been paranoid.
99% of the hard running CJ SS and stocker motors out there (Red LeBlanc and Blair Patrick included) use 427 blocks with 8 (eight) sleeves. Talk about overkill! BUT......with that long a$$ arm and long a$$ heavy rods, I can see a real need for cylinder wall strenth in their applications. We used to bore 390's .060 and .080 over all the time. Especially in our dirt track sportsman deals. We of course filled those blocks also. Back then it was with cement though.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2006, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[Posting Pictures]

[About M&M][Members' Pics]

[M&M Conventions] [M&M Mug Shots] [Tech Articles]

[M&M Bookstore] [M&M Restoration & Tool Supply Store]