302 bored .30 over?
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
if that motor is already at .30 . i wouldnt go past .40. anything more and the cylinder walls will be real thin which causes overheating. some have gone .60 but the motor life is short lived. why are you rebuilding the motor?
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Senior User
Joined: Nov 2004
Posts: 176
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i only have a compression of 2 on #7 cylinder, getting excessiv blowby with tons of oil going into the air filter. plus rear main seal is leaking, and so is the timing cover. I shouldnt have to bore it out...there isnt to much of a lip on the cylinders, should be abloe to get away with honing them.
Senior User
Joined: Oct 2001
Posts: 300
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From: Crosby TX
Do yourself a favor. After you get the block completely disassembled, take it to a engine machine shop and have them check it.
If the block is OK have them hot tank it, hone it, and install the cam bearings.
The cost for this won't be much and you won't be taking a chance that all of your parts and labor will be waisted if the cylinders are out of round or too far gone to hone.
If the block is OK have them hot tank it, hone it, and install the cam bearings.
The cost for this won't be much and you won't be taking a chance that all of your parts and labor will be waisted if the cylinders are out of round or too far gone to hone.
Junior User
Joined: Feb 2005
Posts: 94
Likes: 0
What year is the block? If it's pre 1980, a 60 over will NOT cause overheating. Prior to 1980, ford casted the blocks with very thick walls. I did a .060 on my 79 302, will absolutely NO bad effects. The only time it would ever overheat, is if it sat parked in the summer heat idleing for more than 20 minutes AFTER it had already warmed up. I beat on this engine every chance I got. Constantly turning 3200 rpms @ 60 mph (geared LOW), and probably 300 - 500 drag strip passes with around 15 - 20k miles on the street. When I sold it, it ran perfectly. No overheating, no ticking, no using oil.
However, if it is a 1980 or later block, don't go more than .040 over.
However, if it is a 1980 or later block, don't go more than .040 over.
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