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Discussion Starter #1
Hey guys, I'm trying to decide what intake manifold would work the best for a new 383 I'm building. Currently I'm running an rpm air gap on my 355.

The specs:
383 ci, forged crank, rods, pistons, just shy of 11-1 cr, Comp cams solid flat tappet xs290s (.540", .558" lift, 252°, 260° @ .050"), RHS pro action 200cc heads (may be a tad too small), mostly strip but some street driving. Thanks for your help.
 

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I'd stick with the Air Gap and test a couple diff spacers but that's just me.
I agree with Lug, especially since you already have it. I have the plain Performer RPM along with a 1" open hole wooden spacer on my 383. No track time yet though, hoping for some 11.30-11.50s.:yes:
 

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I have a SR with a duration very close to yours @ 269. It's pretty lumpy in my 406.
It likes to idle around 1200.
Should be very interesting in a 383..

What converter,gears?

I have a big single w/ "1 open spacer,q-850 dp,"8 ATI treemaster,(currently 3.73's) and it flat out hauls!

Plenty of torque.

Besides the cam has the 4/7 swap..and I was advised that they like singles better.
Who knows.

Try the AG like was said. Ya got it.

Good luck.
 

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Discussion Starter #5
I too have 3.73s but with a 4000 stall.
 

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2975 Vic Jr. and at least a 1/2" spacer.
 

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Discussion Starter #8
Cool. Thanks for the feedback!
 

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If you have the hood clearance, I'd suggest the Holley 300-25.
Probably the most under rated manifold out there!

Just my 2cents.....:)

Jeff
 

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If you have the hood clearance, I'd suggest the Holley 300-25.
Probably the most under rated manifold out there!

Just my 2cents.....:)

Jeff
Shouldn't be a problem with my 4" cowl hood :D
 

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I would say with a 4000 converter I would be more concerned with the actual USABLE power curve.
The cam most likely is gonna make power in the 3500-to-7000+ range. Throw in the converter and you're looking at a 4000-to-7000+ USABLE power range. Right where a single plane intake shines.

I personally like the Bowtie intake...
http://www.gmpartsdirect.com/performance_parts/store/catalog/Product.jhtmlPRODID=1007&CATID=995.html

Or for one of the latest favorites of a LOT of builders, look at the Edelbrock 2892 intake...
http://www.summitracing.com/parts/edl-2892/overview/make/chevrolet

Keep in mind that port matching the runners, properly blending them into the plenum maintaining a good amount of taper and working the plenum to even out the port entries could easily be worth 30+ extra HP!!! Just be prepared to see a LOT of metal on the bench and floor when you're done.:eek::devil:
 

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Both the Holley 300-25 and 300-110 are two of the most underrated manifolds out there.
You better believe that!

I did a test, a direct real world test in my car.

The Dorton was on top!
:yes::yes::yes:

Al
 
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