Here's the stuff I thought important for a "period correct" hopped up
motor for my '50 (and with the assistance from K. Pat Smith of Inliners
International):
261 cubic inch Chevrolet 6 cylinder (inline)
Bore and stroke: 3.9405" x 3.7500"
Head:
- 235 - 848 casting
- Elliptical valve profile
- Ported
- Stock rocker arms
- Tubular push rods
Block
- Full flow, pressure oiling
- Aluminum flat top pistons with 9.0 to 1 compression ratio
- Full balance
- Stock 261 rods
- Custom Pontiac harmonic balancer
- High volume oil pump
Cam (poor selection for the intake system)
- Intake and exhaust: 264 duration at 0.250" lifter rise
- Lift: intake and exhaust 0.445"
- Power range: 2,000 to 4,000 rpms
Intake
- Offenhauser dual intake manifold
- 2 x stock Rochester B carburetors
Exhaust
- Dual Fenton cast headers
- 2 x 36" glass packs
- Shotgun 1-3/4" dual exhaust
Ignition
- Stock spark delivery (soon to be converted V6 HEI)
It scoots! The weak link is the stock 4 speed and it may get changed to
a Saginaw in the future (I'm trying to keep the truck period
correct). With 3.55s in the rear, it does very well on the
highway.
Thanks for asking!
Allen in Seattle
'50 3100
Inliner No. 2235
On Tue, 4 Jul 2000 ADvent@thuntek.net wrote:
>
> Tell us about the 261, you caught my interest and others too I would guess!
> "A. Jones" wrote:
>
> > I couldn't agree more. I have a hopped up 261 in my '50 using a stock
> > radiator, water pump, and fan, and have no trouble overheating at all
> > (even when I reef on the engine in the city). I would
> > suspect that either there's crud in some of the block water jackets or
> > your radiator has also lost efficiency through crud build up.
> >
> > I will say as a safety measure, I installed a pusher electric fan in front
> > of the radiator (installs very nicely on the x brace), and it is invisible
> > unless you look up into the grill. The only time I use it is for the fun
> > of it.....
> >
> > On Mon, 3 Jul 2000, Gordon Groves wrote:
> >
> > > I would check your cooling system before you go too far with re
> > > engineering the fan , I also have a '56 235 in my '51 1/2 ton and even
> > > in sunny Tucson AZ it doesn't overheat , even with air temps over 100
> > > deg. It gets hot all right and even after parking for a few hours it
> > > will still be 180 deg. at start up but I haven't had any boiling or
> > > anything like that . Just a thought.
> > >
> > > Gordon Groves
> > > '51 chevy half ton
> > > '54 IHC Travelall
> > >
> > > 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
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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