I am no authority on this question but have read some articles and talked
with people. I depends if you have a core shift block or not. I hear a non
core shift '54 block can be bored to .187 over, yielding .287 cu. in.. Post
55 1st non core shift to .120 over yielding 278 cu in. I have also read that
one person had trouble with rings seating at .120 over and didn't recommend
it. Consider that these recommendations were made back when blocks were
plentiful. I would be reluctant to bore a 261 block to the max, especially a
54, considering they are getting tough to come by. Pistons over .080 get
expensive. I like to leave room for at least one rebuild
As far as rods go; there is room for debate here. GMC rods are nice, but a
person I've talked with who raced many 235 and 261 engines said he never had
a Chevy rod failure.
Grant
50 Chevy 3100
52 GMC 150
New Mexico Jim wrote:
> So, how far can this engine be bored safely?
>
> Grant Galbraith wrote:
>
> > The 54 and 55 1st are a thicker casting in the cylinder walls which
> > allow for a larger overbore. It is also said by some that these used a
> > superior high nickel alloy than the later engines, though there seems
> > to be some
> > room for debate here, and no documentation that this is the case. For
> > guys that want these for a AD
> > the 54 and 55 1st are preferred for the right water pump placement, both
> > height and length.
> >
> > Grant,
> > 50 Chevy 3100
> > 52 GMC 150
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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