Which spacer is best?

[67_Slimer]

So I'm contemplating running a carburetor spacer and have some questions. I have a 340 stock stroke , 10.5/1 , .525 solid cam with 1.6 RR , Eddy aluminum heads , Victor intake with a brawler 750 , 4 speed and 4.56s. I've had numerous people suggest a carb spacer. 1) Are they even worth it? Do they make a noticeable difference? 2) If so what spacer is good for my application? 4 hole? open? also height and material? Thank you in advance.

 

[Heywodja]

Here's a video with Dyno results, this may help..

 

[toolmanmike]

Check hood clearance first then you'll know how far you can go without carving a hole in your hood. Many of the racers use wood. Excellent insulator.

 

[67_Slimer]

Check hood clearance first then you'll know how far you can go without carving a hole in your hood. Many of the racers use wood. Excellent insulator.

I have a six pack hood so clearance shouldn't be an issue.

 

[jbc426]

Wilson makes one of the best. My builder says its worth 15-20 hp on virtually every engine the put it on.

 

[Inertia]

Wilson makes one of the best. My builder says its worth 15-20 hp on virtually every engine the put it on.

Wow, more than headers .
Add an "x" or "h" pipe, gain 40 hp total .

 

[jbc426]

Wow, more than headers .
Add an "x" or "h" pipe, gain 40 hp total .

Good catch, and I would assume lower gains as the motors approach "stock-ness".

 

[Locomotion]

Canton Racing has a wide variety of phenolic spacers including tapered 4-hole. I didn't make any comparisons, but the 1" phenolic tapered 4-hole was what I used on my 360 Dart Sport. Better insulating qualities than aluminum with the tapered bores, or whichever style you choose.

As with most other engine modifications, any changes you make may benefit from re-jetting the carb for optimum results.

 

[forphorty]

I would expect that Speedmaster will have a black friday sale this Thanksgiving. Search results for "carburetor%20spacer"