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Old 12-04-2006, 11:44 PM
Stuart Adams Stuart Adams is offline
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Default Engine Rebuilding

When rebuilding a 427 is 65 over rebore too much? Usually I was told 60 is max, any thoughts?
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  #2  
Old 12-05-2006, 01:01 AM
jeff morocco jeff morocco is offline
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Default Re: Engine Rebuilding

i went .125 over in one of my race motors.....the only problem with that is if you have something go wrong....its junk. no room to fix!!!
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Old 12-05-2006, 01:22 AM
427king 427king is offline
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Default Re: Engine Rebuilding

060 is the max if you are building a newer motor. The early vintage 427 blocks will take that bore size with no issues at all
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Old 12-05-2006, 02:05 AM
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ANDY M ANDY M is offline
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Default Re: Engine Rebuilding

My motor is .100 over. Runs fine with a 160 thermostat. Like Jeff said, drive careful. The powertrain warranty is in your wallet.
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Old 12-05-2006, 05:38 PM
SMGCO SMGCO is offline
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Default Re: Engine Rebuilding

[ QUOTE ]
When rebuilding a 427 is 65 over rebore too much? Usually I was told 60 is max, any thoughts?

[/ QUOTE ]

You need to sonic test the block to determine the actual remaining cylinder wall thickness then you can make the call.
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Old 12-05-2006, 06:25 PM
Chevy454 Chevy454 is offline
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Default Re: Engine Rebuilding

A sonic test would be good insurance, but if it's an older/original 427 block then you should be golden...I've heard several folks going to .100 or better on the older stuff...but, if it's gonna be tight, then sleeve it and you'll be better off for it all around!
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Old 12-05-2006, 09:50 PM
COPO427 COPO427 is offline
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Default Re: Engine Rebuilding

You could sleeve it if the block is important enough to keep for #'s sake.
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Old 12-05-2006, 11:26 PM
Stuart Adams Stuart Adams is offline
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Default Re: Engine Rebuilding

That's the kicker, the motor and the car are restored fresh.
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Old 12-06-2006, 04:05 AM
indyjps indyjps is offline
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Default Re: Engine Rebuilding

i'd bore it and drive gently, if you want to run it hard swap a new block in and keep the orig block on the stand.
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