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Username Post: Boring an early 283?        (Topic#357517)
Posts: 59

Reg: 10-04-18
08-04-19 01:52 PM - Post#2772401    

Pulled the block plug as suggested and got nothing but a black oily grime on face (inside of water jacket) of bolt. This engine has several problem that tell me a rebuild and most likely a cylinder boring will be necessary. This is an all original 57 2 door hardtop 283. Produced around December 56. Can the bored out 265 blocks be bored out further? If so, how much? Thanks.


Frequent Contributor
Posts: 1258

Loc: Tennessee
Reg: 12-06-10
08-04-19 05:02 PM - Post#2772415    
    In response to Beltfed

Gravity causes rust and debris in the cooling system to collect in the bottom of the water jackets along the bottom of the block. It solidifies into muck behind the drain and casting plugs and will cause them to rust.

It is best to remove the drain and casting plugs if it is an old unmolested block or this has happened. Then dig out the muck with screwdriver or hooked coat hanger end from both the drain plug and casting plug holes and flush with water before replacing with new brass ones.

The casting plugs on the back of the block behind the flywheel / flex plate do not usually suffer from this issue since they are not at the bottom where muck accumulates.

Frequent Contributor
Posts: 2228

Loc: DeSoto, Illinois. 62924
Reg: 01-21-01
08-05-19 07:17 PM - Post#2772501    
    In response to Beltfed

I took mine .060 to 292 with no problem
283 to .120 equals 301


Ultra Senior Member
Posts: 12288

Loc: Wisconsin..USA
Reg: 09-27-02
08-06-19 01:08 PM - Post#2772553    
    In response to REBORN55

The 1957 265 and 283 blocks had the same casting so a 265 could be bored out as far as a 283.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible

Frequent Contributor
Posts: 1535
Loc: Granada Hills, CA
Reg: 03-04-09
09-12-19 09:59 PM - Post#2775436    
    In response to Gene_Schneider

The 57 block can usually be bored .125 over, that's the last, but 301 pistons are hard to get in stock cast piston configuration. You could use 302 standard pistons but you'd have to contend with the dome, more compression than you need for a stock driver plus a looser piston -to-wall clearance with the forged 302 pistons. Your call.

Tom Ordway If you don't drive it, why have it?


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