Been working on a 1979 Chevy Half ton short bed 4x4 truck that belongs to a friend of mine. We got some hedders for it and a brand new quick fuel hot rod series 680cfm carburetor. This engine is just a mild 350 and the intake manifold that was on this engine when he bought the truck is an Edelbrock performer and it is a spread bore intake and it is extremely warped and beat up. It has a pretty good size crack in it where the distributer goes through it and you can see oil seeping through it when you drive it around. I told him he needs to invest in a new intake manifold. I told him to buy a square bore 4bbl intake. And he asked me what intake would work best.
So I figured I would ask here, like I said earlier this engine is basically stock nothing radical about it, but we do have it timed good and have hedders on it and have the carb dialed in pretty well.
I've been looking online at different square bore intake manifolds, the Weiand Street warrior intake manifold stuck out to me as well as the Edelbrock performer eps which is a square bore intake as well.
The weiand street warrior is rated from idle to 5500 rpm and the edelbrock performer eps is rated from idle to 5500 rpm as well.
They are the exact same price at summit. So basically it boils down to do i have the correct intakes picked out for a stock 350 that's going to be in a 4x4 truck and who makes a better intake as far as material and casting quality edelbrock or weiand?
We got some hedders for it and a brand new quick fuel hot rod series 680cfm carburetor. This engine is just a mild 350, basically stock, nothing radical about it, but we do have it timed good and have headers on it and have the carb dialed in pretty well.
I've been looking online at different square bore intake manifolds
The very best square bore 4-bbl intake for a 350 Chevy is the dual-plane, high-rise Edelbrock RPM manifold #7101, not the Air Gap, just the standard RPM.
The power range is 1500-6500, which would make you believe it is a race manifold, but this is the premier street manifold for a small block. The motor will never be asked to make power under 1500 rpm's because of the torque converter allowing the motor to rev up past idle to get the truck moving.
This high-rise intake design was originally cast up by the Winters Foundry for use on the '68 and '69 Camaro Z-28 302 cubic inch motor for use in the 5.0 liter road race wars of the 60's. Edelbrock saw the design and cast it up for sale to the general public. The design was so good and worked so well that Weiand jumped on board with their version, the #8016 Stealth and Holley followed suit with their #300-36 Street Dominator. The Weiand and Holley numbers are out of production currently, but can be found used on ebay, craigslist, racing junk, etc., or you can purchase either a used or a new #7101 RPM.
This manifold will make more torque and horsepower from idle to 6500 than ANY OTHER intake manifold that you can bolt on the motor.
I didn't list the PP Typhoon because I've never used it, but it is in the running if Eric says he has used it....
#52020 - Polished finish
#52021 - Satin finish
Same dimensions as the other high-rise intakes listed above.....
Scroll to page 9 here..... http://www.professional-products.com/secure/uploads/file/2013 Catalog Web.pdf
Don't be swayed by the Air Gap nonsense. That's just marketing hype.
I haven't used the Pro Products Typhoon, but I've used 3 of the Hurricanes, and they were all nicely machined, even bought one fully polished, it looked "purty" with a Nitrous Oxide Systems Sportsman Fogger on it.
185.00 for the Edelbrock performer Rpm part number 7101. I will tell him that it's a better intake but that it's 45 dollars more. He will probably go for it. How about the weiand speed warrior part number 8150? It looks awfully similar to the Edelbrock performer Rpm 7101 manifold, And it's 35.00 bucks less then the Edelbrock 7101. The weiand speed warrior part number 8150 is 150.00
Virtually identical....you won't be able to tell the difference if the name wasn't cast on them...power made will be within just a few HP between the two.
Weiand Speed Warrior used to be the Weiand Stealth, just updated by Weiand and marketing gave it a new name.
Thanks Greg. The thing that prevents me from recommending the Air Gap is the reduced drivability in cold weather. A hot intake manifold will vaporize fuel much more easily than a cold one.
To my way of thinking, the Air Gap is just marketing hype, same as the Extreme Energy line of cams from CompCams or their fosdick half-azzed rocker arms that have a traditional ball and socket fulcrum with a worthless roller on the tip, which I will neither use nor recommend. Some things just don't blow my skirt up.
The original Z/28 "high rise" manifold is GM 10185024. They used to be cheap, now its half a grand for a nice one. There is a cast iron version out there too if memory serves.
Holley rebranded the 300-36 as the "Contender" back in the 80s (judging by its RoboCop-esque logo). You can still find those really cheap sometimes; especially if they're being sold by someone who isn't a "car guy". It doesn't look like much to the layperson, with 80s font and single 4bbl, non airgap design, and not being an edelbrock or weiand ("say why-and"). Grind off the logos and spray it orange...killer sleeper manifold. I have one stashed away, got it at a pawnshop for $60, needed to be cleaned and some threads repaired.
The EPS is essentially a stock replacement manifold. Ive never looked at one in-depth in person, so I dont know how large its ports are, but it seems that its biggest feature is the ability to use an oil fill pipe (for the traditionalist/ resto crowd). If you know someone with a bridgeport, you can add an oil fill pipe to a Performer RPM.
Question: Was there a re design of the RPM manifold at some point? Ive seen some with bigger ports than others, but didnt get to eyeball them close enough to see if they were massaged, or cast.
Question: Was there a re design of the RPM manifold at some point? Ive seen some with bigger ports than others, but didnt get to eyeball them close enough to see if they were massaged, or cast.
There was a redesign, but I can't tell you when it was, I don't remember the time period...late 1990's maybe. The earlier version had bigger but less streamlined ports and "blocky-er" port junctions, the later version has more gentle curve to the ports and slightly smaller runners, but the later version has been shown on flow benches to be better flowing despite the smaller runners.
Kind of like comparing Torker II runners to a Victor Jr. in how they are shaped.
He is trying to decide between the Edelbrock performer Rpm and the Weiand Speed Warrior. He said he will go with whichever one he can find cheaper. I ran the Edelbrock Rpm Air-Gap on my crate 360 magnum and I didn't like it for my application. We live in Idaho where winter is the longest season and it routinely gets below zero here for weeks at a time. warm up time on my 360 magnum with the E-Brock Air-gap was a half hour when it was cold outside.
It performed well in the summer time, but in cold weather it took forever for my engine to feel completely warmed up and ready to go.
There isn't a wide variety of 4 bbl intakes made for the 360 magnums, there are 4 choices. The edelbrock Rpm Air-Gap, Professional products cross wind which is the chinesse copy of the e-brock air-gap The Mopar Performance M1 single Plane And the Mopar Performance M1 Dual plane. I decided to buy a Mopar Performance M1 dual Plane and put it on and see how it performed.
I was pretty impressed with the performance of the mopar dual plane M1.
I put a 2 inch 4 hole spacer on top of the mopar dual plane M1 and it performs just as well if not a little better then it did with the Edelbrock Rpm Air-gap with a 1 inch 4 hole spacer. And my engine feels like it's fully warmed up and ready to go after about 5 to 10 minutes of choke vs 20 to 30 minutes of choke with the Air-gap.
I was told The Mopar Performance Dual Plane M1 is basically a copy of the Older Edelbrock Ld340 intake, which I am told was one of the best intakes made for a small block mopar back in the day.
Anyways I thought I would share how I felt about the e-brock Air-Gap in cold weather. I didn't care for it at all, I felt I waisted a lot of fuel running it where I live and I imagine it was harder on my engine as well, because of raw fuel entering the engine when it was really cold outside.
I know my 360 magnum responds very well to 4 hole spacers, Like I said I was running an edelbrock rpm air-gap with a 1 inch 4 hole phenolic spacer and I changed the intake over to the mopar performance dual plane m1 and ran the 1 inch spacer and I felt I gave up a little torque in the mid range, so I decided to try a 2 inch 4 hole phenolic spacer on the mopar intake and it responded very well to it, once I added the 2 inch 4 hole spacer to the mopar intake I noticed I had just as much power if not a little more then I had with the 1 inch 4 hole on the e-brock air-gap.
. If you're in Montana and not going to make any changes to that stock '79 350, just use any exhaust heated intake manifold, iron or aluminum, new or used, that's not warped or cracked that fits your desired carb. that you can find cheap... because none of them will be a noticable restriction to that engine...
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