pracy

Hey all,
I have a 351c in an XE. I am trying to get the carb away from the manifold and heat etc.
My car red lines at 6,000ish so I am best suited to a dual plane manifold but have a torker single at the moment. I will be moving onto dual plane very soon.

out of these spacers what would you guys run?
-I have a hornet scoop so I would be able to fit up to 2" extra.
-I am running a hume 650DP holley. Not sure of listing#.


-Open 1" Spacer, Black Phenolic Plastic ....#8710*
-4-hole 1" Spacer, Black Phenolic Plastic ....#8711*
-Open 2" Spacer, Black Phenolic Plastic ....#8712*
-4-hole 2" Spacer, Black Phenolic Plastic ....#8713*
-Performer Divided-Wall 1" Spacer, for Two-Plane Manifolds ....#8714*
-Open 3/4" Spacer, Wood Fiber Laminate ....#8719*
-Open 1" Spacer, Wood Fiber Laminate ....#8720*
-Open 1/2" Spacer, Wood Fiber Laminate ....#8724*
-Divided 1/2" Spacer, Wood Fiber Laminate ....#8725*

taken from
http://www.edelbrock.com/automotive/install1.html

I am thinking...
OPEN- good for high HP, along the lines of single plane.
4 Hole- good port speed, good for me maybe?
DEVIDED- good for dual plane but still higher rpm maybe

also this quote shows woods to keep the heat out better....
"Use open spacers where more plenum volume or more carb-to-plenum floor distance is required. 4-hole spacers enhance low-rpm torque and throttle response and dampen reversion effects on the carb. The superior heat insulating properties of wood fiber laminate are ideal for reducing heat transfer to the carb."

I would love it if the spacer didnt effect HP or Torque at all, I am only doing it for the heat transferr problems.
do the wood spacers look shit?

I will poll a couple I am guessing are correct.

Thankyou all!!

davis

The right spacer can really boost performance. If you're looking to just insulate your carburetor, there are 1/4" laminates and paper insulating gasket/spacers. You can also build your own very easily by simply laminating several gaskets together using a good, high-temperature adhesive.

:davis:

347

My 347 stops making power at 6000rpm.

I also have a 650dp but I am running an rpm air gap .

I tried an open 1" alloy spacer ( better top end, less low end response, sort of spongy feel)

A plastic 1" 4 hole (what I am curently running, nice low down crisp responsive feel , pulls all the way to 6000 )

Tried them together very soft spongy until 3000rpm and then nice and hard till 6000

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TruBlu351

Plastic ones are really cheap. Anything but metal would be good for insulation. Don't be fooled into buying one of those flash looking anodized aluminium jobs for several hundred $. They do nothing for insulating the carb from heat either.

I'm running a 2" four hole on the XD and the Hornet scoop comes in handy!

Even though you only rev to 6000, I'd still keep the single plane. Are you running a 2V or 4V Torker?

Look on ebay motors. I bough mine for $22. Here's some examples.

Plastic 4 hole 1"

http://cgi.ebay.com/ebaymotors/ws/eB...958869924&rd=1



Plastic 4 hole 2"

http://cgi.ebay.com/ebaymotors/ws/eB...958869966&rd=1

__________________
XE Falcon
393 Tremec TKO 9"

brenx

I ran the open one. I personally believe the 4 hole ones woudl be too restrictive but thats my personal opinion.

I'm yet to try the spacer on the new setup.

Brenden

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XB Fairmont (street car) 11.07@123.02mph.

TruBlu351

You may be surprised.

Dyno results I've seen for similar engine combo to yours, the 2" four hole came out on top.

__________________
XE Falcon
393 Tremec TKO 9"

pracy

I ended up buying a BG 1" 4 hole. got it for $60 from vpw.

the torker is 2v but ported, mismatched to by std 2v heads....

STROKEXD

TruBlu have you got the www address for the dyno results?

I'm running a 1inch open spacer at the moment, was thinking of upgrading to a 4 hole spacer on a hunch it would give some improvement. Don't know whether to go 1 inch or two inch. What's your thoughts?

Are there any other guys out there that can report what their experiences have been with various spacers?

__________________

davis

Restrictive? A 4-hole spacer is akin to an extension of the carburetor base plate. There is no restriction. That's like saying a 4" piece of pipe is less restrictive than a 5" piece of pipe of the same diameter.

The primary difference between open and 4-hole is that the open spacers increase plenum volume substantially, whereas the 4-holes do not (relatively). The 4-hole spacers tend to better handle reversionary effects, but this is somewhat dependent on the design of the 4-hole spacer.

There are situations where each type spacer is generally better suited. For example, an engine with a dual plane inlet may improve slightly at the top end with a 1" open spacer. An engine with a open plenum inlet may improve quite dramatically down low with a 4-hole spacer, without sacrificing high end power.

The thickness of the spacer is a tunable element. The type of spacer that is right for a particular application depends on the particular engine and related combination.



I use a 1" 4-hole spacer on my 393" stroker Cleveland. It isn't about restriction, it is about controlling reversion and improving the signal at the venturis.

:davis:

TruBlu351

I spent an hour trying to find the article in my magazines last night. I believe it was in a US mag called Car Craft. I'm away for the weekend, but I'll try and get a web link when I get back.

__________________
XE Falcon
393 Tremec TKO 9"