Offenhauser 360 intake manifold

[Withers]

Am considering an Offenhauser 360 intake for my 340, anyone out their have
experiance with this manifold? How do they flow? I will be using it with an
Edelbrock carb. Should I go with an Edelbrock intake, or is the Offenhauser
just as good? Thanks for any input.

Andrew

[Darrel Ericson]

I really don't like the design of the Offy. It is a low single plane with a
divider down the middle ... not a "real" 180 nor a 360. The runners are all of
about 2" long. There has to be charge robbing between the 3-5 and 4-6 cyls.
I'd go with the Edelbrock or Weiand every time ... tuned runners, "real" 180's
and you can machine the divider if you desire.
If you insist on the Offy I have one painted a nice "273" red.
Darrel

[Joshua S.]

Depends on which Offy you are considering. If you want a race single plane
intake the Port-O-Sonic is quite good. If you want a street dual plane better
stick with a Performer RPM or the big Weiand.

Joshua Skinner

[Eugene Bain]

my opinion of edelbrock is that they are a chevy only item. Offenhauser is
one of the original vendors that chrysler used, and the one being used now
is weiand. for what its worth
Withers <wit...@umr.edu> wrote in message news:381d...@news.cc.umr.edu...

[Joshua S.]

Well the Mopar Engine Book lists the Holley Strip Dominator
intake manifold as being the equal of the Offy Port-O-Sonic. So
maybe Holley makes a good manifold?

In my opinion many of the manifolds out there are copycat items.
Weiand has a copy of the Performer RPM for example. The
Edelbrock Victor series manifolds is very similar in layout and
port shape to the Port-O-Sonic and Strip Dominator. I don't
really think there are any real innovators in 4 bbl manifold
technology. Probably 90% of the power gains in American V8s
between 1968 and today are from cylinder head development.

The Performer RPM package makes 420 hp on a small (350) Chevy and
the 340 Mopar made 417 hp with 10 fewer cubic inches. So is
Edelbrock equipment only good for Chevys?

Joshua Skinner

[PISHTA]

Well the Mopar Engine Book lists the Holley Strip Dominator
intake manifold as being the equal of the Offy Port-O-Sonic.

Is that book saying the manifolds are of equal performance, or casting? I have
a Strip Dominator (HOL-300-8), and it looks a little different. I can put a
fist under the plenum of the Holley, the Offy is a lower, solid casting (6073).
Both within 5 bucks of each other in PAW catalog.

[Joshua S.]

PISHTA wrote:

Equal performance. The Mopar Engine Book actually recommends some modifications to
the Port-O-Sonic for proper fuel distribution. No modifications are required for
the Holley. So for my money I'd do the Holley Strip Dominator.

Josh