Ok,
To make the 235 head work on a 261 you have to drill the "steam holes"
into the water jacket of the head. The easiest way is to take the 261
gasket and mark the hole location on the 235 head. It's the same thing
you have to do to use 350 heads on a 400. Sometimes I think that Detroit
never comes up with anything new they just recycle old ideas! Lets
see... Chevys used to use center bolts on the valve covers, then they
went to edge bolts, now they are back to center bolts on the Vortecs :-)
The outside oil line was an aftermarket accessory. I see them pop up
NORS on the un-named auction site about monthly. Awhile back a guy had a
whole box of them. I don't remember the brand, not GM but something
you'd get at a FLAPS. I gather it was a really common mod on the low
pressure dipper engines, probably when the passages were getting clogged
from that non-detergent oil :-)
--
John Dorsey
Wauchula, FL
'49 Chevy Panel http://www.strato.net/~jrdorsey/truck.htm
'52 GMC Firetruck http://www.strato.net/~jrdorsey/fire/fire.htm
'51 Chevy suburban http://www.strato.net/~jrdorsey/burb/
Deve Krehbiel wrote:
>
> I can accept that there is an oiler port for the rockers on the outside of
> this engine, but I dont see that on all 235's. This is a 261 (1959 model) so
> maybe its normal. I am trying to ascertain whether or not the 261 motor has
> a 235 head on it. This might explain why the PO was having trouble getting
> oil to the rockers. When using a 235 head on a 261, there are two holes that
> need to be drilled in the head. I got that from Jim Carter. What I dont know
> is, what are those holes for? Maybe one of them is to provide an internal
> path for oil to get to the rockers? Since the manifolds are off, I figured
> now would be a good time to see if anyone here knows.
>
> Thanks again
>
> Deve
>
> ----- Original Message -----
> From: "R. Welch" <rwelch@ionet.net>
> To: "Ole Trucks" <oletrucks@autox.team.net>
> Sent: Sunday, December 03, 2000 4:23 PM
> Subject: Re: [oletrucks] In defense of the farmer
>
> > Well, I thought someone already posted to this issue. On an old 235 I
> had,
> > the rocker arm assembly wasn't getting any oil. I was told running the
> > tubing from the block up to the fitting in the head provided direct oiling
> > and was a quick fix short of tearing down the whole block and finding
> where
> > it was plugged. I don't think its any big deal - it seems to have been
> > commonplace. Now, why the hole is in the head to provide this relief to
> > begin with I don't know, but it obviously was put there by the factory so
> I
> > assume it was foreseen as a potential problem by GM.
> >
> > Bob Welch
> > '56 Cameo
> > '55 Belair
> > Bartlesville, OK
> >
> > ----- Original Message -----
> > From: "Deve Krehbiel" <dkrehbiel@kscable.com>
> > >... I am trying to figure out why my farmer
> > > friend decided he needed a different oil line going up to the rocker
> > > assembly.
> > > Deve
> > 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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