The Stovebolt Site Forums The Shop Area Engine Shop Which intake to use?

I have two different intake manifolds, and I'm wondering if one is better than the other. I've measured all of the ports and the sizes are the same. Post spacing for the carb is identical, and I've verified that the carb will fit on both manifolds.

The intakes are the same except for the "box" that the carb mounts to - one is about 2X taller than the other. Pictures here:

http://www.sacred-cactus.com/g2/v/troy/61Chevy/intake/IMG_2581.JPG.html
http://www.sacred-cactus.com/g2/v/troy/61Chevy/intake/IMG_2585.JPG.html

The intake in the back that is rust-colored appears to have a smaller port in the center under the box, but it is an optical illusion. I measured everything with a dial caliper. The blue manifold is the one that has been on my truck since I bought it and the other is a spare that I've had. I am replacing a cracked exhaust manifold, and so I figured I'd ask while I'm at it.

Thanks!

troymckaskle,

My bet is that the taller one came off a older engine, and the shorter one a newer rig..more like your '61.

From a "Stroker McGurk" standpoint, the taller one might give you some additional 'ram' effect for the fuel/air mixture, but the length of your throttle linkage might dictate which one you actually use.

Stuart

Thanks, I thought about it more and ended up putting the original one back on because gettings things together right with the manifolds is such a PITA, and I didn't want to get things buttoned back up and find out that I had issues. Much easier job with 2 people...