Intake Manifold

[Sauron327]

I have a 70 LT-1 intake(3972110 dated 10/20/69) on my 67 that I believe deserves a proper home. I humble myself by saying performance upgrades are not the area which my knowledge lies. My driveline specs are as follows: 67 327, .010 over, stock pistons, 63 vette heads, mild cam ( can't locate specs) stock dist. ( switched vacuum as John Z. suggested ), stock exhaust manifolds, Holley Street Avenger 670CFM ( should be 570 ), 2 1/2" Flowmaster w/ crossflow muffler, M-21, 3.08 posi(which will be changed to 3.55's or at least 3.31's.)  I know I should run a dual plane and is the popular Air Gap manifold a good substitute? I also have an older Edelbrock Performer but I don't like the fact it is dual duty Holley/Quadrajet. I drive my car, rarely beat it, cruise the back country roads. Or should I just run the Snowflake? Thank you, Scott

[hotrod68]

I vote the Snowflake--it'll look really cool and with your mild engine and manifolds you don't need the hi-rpm Air-Gap--it might actually hurt your off-idle torque. Just my opinion and good luck!

[Sauron327]

 It's been on the motor for 13K mi. already. Seems that it's worth a lot more to someone who can use more for origionality. Correct, found out the Air-Gap is not the way to go for my driving requirements. I like my low end. Thanks.

[tom]

Actually I think there are two versions of the air gap. Air gap, and air gap rpm. one for high end performance, on for low and mid range performance. The base could be a good choice for a driver. If you drive in winter, I have heard of cold related problems (icing) with the air gap. That said, if it works why fix it?

Tom

[Sauron327]

I never drive in winter. Did a frame off nut & bolt but I run my cars. Besides its a Jane built in stock fashion but what I wanted. MM / Parchment deluxe. I agree to stay away from RPM style.  I like the Snowflake but it's worth $ that can be put into another build. and my spare Performer may work good as well. More research to do. Thanks.  Scott

[Fastorange]

the performer will flow a little more than a stock mani but not as good as an air gap. It will work fine.  I has one on a stock 350 that came out of a 71 chevelle. with a 650cc Edl carb. i put that motor in my el camino. drve it everywhere. in snow, rain

[pdq67]

Did it start out life as a 210hp/327 by chance?

In other words sell your snowflake intake for the money and install an early old Performer 2101 or a Weiand 8004 off ebay that I figure will cost you $35 to $50 or so plus S&H?? It and a stock Q-Jet. 

Heck, I just bought a stock aluminum Q-Jet intake for $10 yesterday so go from there and as a matter of fact, up to 34 to 3,600 rpm, you don't get any better than the stock Q-Jet.

We can make it suck way better up top by installing a 1" thick aluminum spacer and bull-nosing it w/ a 1/2" radius from the top down way back into the ports IF you want to go to all this trouble?

And imho, the 3.08's and the M-21 are killing you! 3.36's and an M-20 is great by me here for you.

pdq67