Phenolic spacer

[jason79]

Looking at adding a phenolic spacer to my 440. Weiand square bore single plane intake with a 750 speed demon carb. Thinking 1/2" thickness, as hood clearance is not an issue. My question is what one is better the square bore one or the 4 hole one? Any pros or cons to either? Price is the same for both. Thanks Jason.

 

[Lionized]

4 hole is only good if your primaries and secondaries are the same diameter.

 

[Car Nut]

4 hole is only good if your primaries and secondaries are the same diameter.

I agree.

You don't need one of those fancy ones either, mine was less than twenty and works perfect. What brand are you thinking of using?

Gorgeous car Jason!

 

[Steve009]

I just purchased a 1/2" 4 hole because I read that they are better for street use (low end torque). Something to do with the air/fuel swirling through he holes.

Beautiful car!

 

[PurpleBeeper]

I hear good things about phenolic spacers. I ran one of those aluminum/gasket/aluminum/gasket "stacks" with the top piece of aluminum being quite a bit larger (supposed to "deflect" heat away from carb). I had to trim the big plate to clear the vacuum nipple tree on the back of the manifold, but it worked well....just another option, but phenolic should be fine.

 

[Cornpatch MO]

What is the difference between plastic and phenolic?...............MO

 

[Steve009]

What is the difference between plastic and phenolic?...............MO

Phenolic is a better heat insulator

 

[SlinktRR]

If you have the hood clearance try a 1" or 2" spacer. Depending on what kind of intake you use, you could see real power gains wide open throttle with an open spacer. If you have a hi rise large plenum volume intake like a Victor, then it may not make much difference. But a small volume single plane intake like a holley street dominator could use the added volume afforded by a spacer. I'm not familiar with the weiands so cant comment on those specifically. try them all, they are cheap and easy to swap.

 

[Bruzilla]

The Holley phenolic spacer is made of a hard plastic material, and the Edelbrock is made from a Nitrile rubber with wood fibers so it compresses a bit and seals a bit better than the Holley ones in my opinion. I went with the single hole, 1/2" one and it works great.

 

[jason79]

Thanks for the replies guys, I picked up a 1/2" one, square hole, off of ebay for like 15 bucks. If it isn't enough I'll move up to a 1" spacer.