When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The 4 holer helps low end torque and the single big on helps top end horsepower. And on a stock or near stock motor you will never notice the difference.
Also, what about spacer or no spacer? I just have always ran one, and have heard that it helps out with fuel burning process. Hence a smoother running engine. Bunch of horse schit blowing in the wind or what?
No spacer puts the carb right next to the manifold and that can transfer more heat to the carb. Carbs and heat are a no-no. I removed mine and installed a heat sync spacer set just because less heat is better. I prefer a space as long as I'm not running a manifold with very tall carb mount pad.