383 Block Max. Bore

[Wahoo2]

Just a question for everybody, is the max. bore for a 383 block the same as that of a 400? They're both B Blocks ( 361", 383", 400") so just wondering the differences. Any help would be appreciated.

 

[Funship32]

The stroke is the same between the two engines but the bore is not. And you will not be able to safely bore a 383 to a 400 size. The std bore of a 383 is 4.25 and for a 400 it is 4.34.

 

[super-bee_ski]

Thanks you for that info "Funship32"
Would it be safe to say: "Nothing over 0.60" ?

 

[Wahoo2]

.60 over is what I was thinking also but wasn't sure of the differences in the blocks. Thanks for the thoughts.

 

[Meep-Meep]

Typically nothing over .040" on any Chrysler but .060" is not usually a problem. Might want to do a sonic check at .060"

 

[super-bee_ski]

All good info...
Thanks guys!

 

[texas69bee]

.040 is recommended per service manual

 

[Funship32]

Typically nothing over .040" on any Chrysler but .060" is not usually a problem. Might want to do a sonic check at .060"

X2.