RE: 318 Poly manifold and carb

[Earl Helm <earlh@xxxxxxxxxxxxxx>]

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Ken,

I am sorry, I missed it.  I get it now... Hey, I am a RB guy but I think
Polys are neat. The old dual quad manifolds are old technology, But
they are very high on the WOW scale when you open the hood. I am
thinking about running the dual quad manifold CH4 on my 440 just
for that reason. I know I can get more horsepower with a Dominator, but
what the heck, it is a street car.

I am kind of sorry I sold my Poly truck, I was looking forward to
building one. 

Earl


Hi Earl,

No, I know your manifold is a stock dual plane.
What I was trying to say is that the factory dual quad is a single plane
manifold and that when I put my factory dual quad next to the Wieand
manifold I was surprised to see that they look identical right up to the
point the carbs mount.  I mean the same squared off runner area and
plenum.  

Now no is saying stay away from the dual quad setup because it is a
single plane and the velocities are too low, yet it looks the same as
the Wieand.  Someone said the dual quad was 50's technology, but so is
the single four barrel and the B/RB engine!  I was just hoping there was
some hard data as to how they perform.  

I know, I should just drop a 451 in it and not worry, huh?  :-)

Thanks,
Ken 


-----Original Message-----
From: Earl Helm [mailto:earlh@xxxxxxxxxxxxxx] 
Sent: Thursday, November 18, 2004 4:07 PM
To: 1962to1965mopars@xxxxxxxxxx
Subject: RE: 318 Poly manifold and carb

Ken,

The Poly manifold that I have is NOT a single plane. It is a duel plane
manifold, square bore. I don't have a dual quad manifold, it is a SINGLE
quad manifold...... Cam is a function, but if you check flow numbers on
Polys you will find that they flow much better than the later 318s,
their ports are bigger to start with. It does not take much to cut down
the velocity and then the horse power. I was just reviewing a dyno
report on a supped up 318 (not Poly) and it was making 325HP with 318
heads that were mildly ported, they then put 360 heads on it, (yes they
were milled to get the compression up) and the HP dropped to 293. On my
500IN motor, I am being very careful with the port size - VS - cam and
compression to make sure I have the velocity needed. It is more
important than most people think.

Earl

Earl,

Would it have the velocity if it were stroked to a 400 CID?
I would hate to go back to the HEAVY cast iron stock manifold.

...and I've said it before and I'll say it again.  The factory iron dual
quad manifold has the SAME single plane design as the Weiand (I have put
them side by side) and no one has said that one has a velocity problem.
In fact Ma Mopar must have thought is was good since they put it on
their cars.  It looks to me like Weiand just turned the factory dual
quad into an aluminum single 4 barrel.  

I know my 318 really starts to pull when the RPMs come up, but I think
that is also a function of the cam.  

Does anyone have any hard data on the manifolds?  

Regards,
Ken

-----Original Message-----
From: Earl Helm [mailto:earlh@xxxxxxxxxxxxxx] 
Sent: Thursday, November 18, 2004 2:11 PM
To: 1962to1965mopars@xxxxxxxxxx
Subject: RE: 318 Poly manifold and carb

Yep, a little better, but not much.... I just don't think that Polys
have the velocity for a single plane. 



Earl, have you tried a 4 hole spacer on the Weiand?  This often picks up
a 
little low end by making the runners a bit longer and improves signal to
the 
carb.  The taller the better.  Just a thought....Joe

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Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
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