Which Intake Manifold?

[7duster4]

Which intake manifold is better for a small block Mopar. Mine is a 1974 318. A couple people have recomended the Edlebrock Performer. But what about a Holley Street Dominator? Which would be better. Just wanted to get second opinions. Thanks

 

[dusterdon]

if you're only changing the intake then the performer is your way to go. if you're also changing a cam, convertor, headers, and gears, then go with the street dominator.

 

[dodge freak]

They both have small ports and thats the biggie. Offy is the only other one I know of that has small port manifolds brand new. Summit has them but some are special order. I have a Offy high rise equal flow single plane thats good from idle to 6500 they claim. I like it, it gave my 318 motor a smoother idle over that perfomer manifold and seems just fine down at low speeds and great after 4000 rpms. I do have 3.91's gears. All of Offy manifolds come in big ports for 340-360 and small ports for 273-318. They even still make the 1965 273 intake with the small 5/16 intake bolts

 

[charles]

You might look into Mopars M-1 intake - I have one on my motor and my brother-in-law runs one on his small block also. Both of us are pleased with the results. Mopar has spent alot of research and development on what works with there engines. :-k

 

[AdamR]

The M1 dual plane is just a aluminum version of the cast iron 340 intake. You will see no gains other then less weight over a stock 4bbl intake. The M1 single plane would be way to much for most 318s. I would use the performer if the rest of the motor is stock.

 

[dodge freak]

I would not count on Mopar now of days to make our old motors run better. Maybe some of their racing stuff like engine blocks are good but I do not "trust" them. Go with Eddy, Holley or Offy. Yes for a mostly stock motor Eddy might be the best.