A 1954 or early 1955 261 block (casting number 3733946) is supposed to have
more cylinder wall thickness and unless there is a core shift, can be bored
3/16". That makes for 278 cu.in. Not bad, but considering the cost of
special pistons, and the fact that GMC rods and oil pump are almost
mandatory for a hot 261, why not start with a GMC in the first place?
Jack Halton
51 GMC 1/2 ton
Winter Park FL
----- Original Message -----
From: "New Mexico Jim" <ADvent@thuntek.net>
To: "Jack Halton" <safesix@earthlink.net>
Cc: "Oletrucks" <oletrucks@autox.team.net>
Sent: Sunday, October 08, 2000 4:25 PM
Subject: Re: [oletrucks] 261 engine.
> which model 261 is better? I don't care about an oil filter. My non
filtered one has just done well without any filter at all. I read somewhere
that is one is better for hopping up than the other and not, because of the
filter ordeal.
>
> Jack Halton wrote:
>
> > All 261 are full pressure, in the sense that that the crankshaft has
insert main and rod bearings, for full pressure lubrication from the oil
pump (no dip and splash)...But only the '58 - '62 261's have provision for
full pressure remote oil filters. Earlier models use only a cannister
(bypass) filter, or none at all. Even the '58 - '62 261's may not have the
hoses and filer head installed, but the fittings are there.
> >
> > ------Original Message------
> > From: "William M. Schickling" <wschick1@twcny.rr.com>
> > To: Oletrucks <oletrucks@autox.team.net>
> > Sent: September 30, 2000 3:50:47 PM GMT
> > Subject: [oletrucks] 261 engine.
> >
> > I have been e-mailing someone about a 261 engine. Are all 261's full oil
> > pressure ? Is this truly the engine to get if you're going to upgrade
from a
> > 216 ?
> >
> > Bill Schickling
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> > Jack Halton
> > 51 GMC 1/2 ton
> > Winter Park FL
> >
> >
> > 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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