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Discussion Starter · #1 ·
A guy is wanting to sell some pistons, and said that they are .125 over bore. Does that sound right? I have never heard of a oversize 427 piston that was .125 over bore.

He said that your bore needs to be 4.375, can you get that much with a 454 block? without having it sleeved.

Thanks for the help.
 

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I've seen lots of people bore a 454 block .100 to 4.350, but .125 sounds like alot.

You could have the block sonic checked to see how thick it is.
Stephen

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67 RS/SS 350 700R4
69 SS clone unfinished
72 454 Weekend Racer
 

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corny,
.125 is a pretty popular over bore with the drag racers, but definitely requires a sonic tested block, and preferably also filling the block with Hard Block. I would probably pass for a street engine,

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Bill Koustenis
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Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
 

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corny,
.125 is a pretty popular over bore with the drag racers, but definitely requires a sonic tested block, and preferably also filling the block with Hard Block. I would probably pass for a street engine,

------------------
Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
 

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Discussion Starter · #5 ·
Thanks, I knew for $75 for the set was to good to be true.

Sheez I'm glad I asked before I got them.
 
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