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Author
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Topic: Maximum Bore size on a 302
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Pierre
Gearhead Posts: 661
From: Near Paris, France
Registered: Apr 2002
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posted 06-06-2002 04:03 PM
 
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  !
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-06-2002 04:22 PM
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
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Pierre
Gearhead Posts: 661
From: Near Paris, France
Registered: Apr 2002
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posted 06-06-2002 04:34 PM
 I guess my engine has a spare life
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fastcomet289
Gearhead Posts: 140
From: ventura ca
Registered: Feb 2002
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posted 06-06-2002 06:23 PM
i know that you engine halls butt, but what kind/ how often is the maintence, and engine life with .70 over? just wondering
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1970 mach1 351c
1965 comet 289
http://mustangsandmore.50megs.com/fastcomet289.html
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-07-2002 12:37 AM
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
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n2oMike
Gearhead Posts: 3058
From: Spencer, WV
Registered: Jan 2001
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posted 06-07-2002 10:25 AM
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
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-07-2002 11:14 AM
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
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n2oMike
Gearhead Posts: 3058
From: Spencer, WV
Registered: Jan 2001
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posted 06-07-2002 02:22 PM
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).]
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-07-2002 03:27 PM
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
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