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Need Intake Purchase Advice

6K views 22 replies 5 participants last post by  jmichaelre 
#1 ·
Looking to replace my spread bore intake and purchase a square bore so that I can get rid of my adapter plate and better signal from my holley carb. I want another dual plane.

Wondering if any of you have had good experience with any particular brand or model for street use. I want to maintain my low and mid range torque.

I currently have the Edelbrock 2101 intake manifold matched up with the Edelbrock 2102 Cam.

I don't want to swap the cam or anything else just the manifold.
 
#4 ·
Are you talking about the little 1/16" thick plate that comes with the Performer to allow a squarebore gasket to seal to the manifold? I can't see that affecting your carb. Or are you actually using a square to spreadbore carb adapter? If so ditch it and get the correct plate from Edelbrock or install a 4 hole heat insulator plate, that will do the trick.
 
#6 ·
Isn't the EPS designed for use with the edelbrock carb? He's using a holley.
I currently use a performer RPM with a holley and 1" spacer and it works great. Eliminating the spacer might transfer more heat to the carb. Thats a no no in the performance world as I understand it.

I would go with the performer rpm and heat block (woodie) :D
 
#8 ·
Performer rpm can accept a spacer (not adapter). I got one at AZ cheap (aluminum) that has a removable incert for 4 hole or open plenum. I use the 4 hole as I have a stock heavy duty factory cam and the bottom end torque is great for my off road 4x4 and pulls good to 5000 rpm. :D
I have an 1850-2 600 holley on it now and the response is instant off idle.
 
#10 ·
Depends on the bolt pattern of the spread bore intake. The 4 hole spacer I bought came with the new extended bolts for the spacer. I'm not sure of the bolt pattern of the spread bore. You'd have to measure the pattern and check the spacer pattern to see. I'm sure someone on here knows that info. :D

First, read simular posts titled stock vs performer intake at the bottom of this thread to see if you really want to use the spread bore. :D
 
#12 ·
The 2101 is intended to accept either a spreadbore OR squarebore, it has BOTH bolt patterns and comes with a thin plate that allows the squarebore gasket to seal at the rear throttlebores where the manifold carb base kicks out for the large secondaries of a spreadbore. You do NOT need a carb adapter, just that little plate or any heat insulator or carb spacer that will seal against the manifold which is just about every one i've had my hands on in the past 10 years. I was running a Holley 600 and a 1" thick four hole carb spacer/heat insulator on an Edelbrock SP2P-318 which has the exact same carb pad setup as the 2101. I have since switched to a Q-Jet and wil never switch back. Off idle response improved and I gained 2 MPG over a well tuned Holley 6619.

The EPS has a squarebore carb pad, the Edelbrock Performer carb is a squarebore like a 4150 or 4160 Holley. It has a dual bolt pattern to allow it to fit on early AFB manifolds without an adapter as it is basically a Carter AFB.

If you want better throttle response and mileage get rid of the adapter AND squarebore carb and put a Q-Jet on it. JMO but it's one shared by quite a few people.
 
#13 ·
My opinion.

Q-jets are good performance carbs except for 1 thing. part throttle performance (puny primary venturi's). Yes, they will give good milage cruising around in the city/hwy. But, the square bore carb (in your case holley) you will have more fun at part throttle without having to dip into the secondary's like on the q-jet. JMO!
I'n not trying to talk you out of what anybody else says everyone here has a good combo but it just boils down to what you want out of your motor and it's your decision in the end. I think you would be happy with the edel. rpm, spacer, and your holley. you can find good rpm intakes on craigslist cheaper than new and the spacer isn't that much new. The spacer comes with extended bolts and all the base gaskets included.

My experience with edel's, q-jets, and holley's all boils down to disconnect the secondary's on all 3 carbs and the holley will out perform the rest on just the primary's. I've had all three on my 350 and the holley runs best.

My combo is just factory HD cam, long tube headers, edel. perf. rpm, 1" spacer, and 600 holley vac secondary, TH350 w/shift kit and 4:10 gears.
I'd like nothing better than to drop the engine in a 60's or 70"s car and loose the extra 2,000 lbs over my 4x4. But then again, I would probably be back in jail, out of fine money, and another suspended drivers license like I was in the early 70's. :D
There's no bad info on this thread it's all good but replacing the holley with another carb will probably be your biggest expense. Good luck! :D
 
#14 ·
Well the carb is staying for now.......its the most expensive part of the combo.....and I now have all the adapters and linkage setup to work with my 700r4 plus all of the cams, springs....aftermarket bs....I will buy the 1" 4 hole spacer and see how it works out.....

I'll let you guys know......
 
#17 · (Edited)
Shines how? In a milage test? I find it hard to believe that the small primary's of the q-jet can pass the same CFM as the larger primary's of the holley square bore. In my test with a 600 edelbrock, 600 holley, and whatever size Q-jet that came with my engine, the holley won hands down with my combo.
My 1850-2 was re-built by me to factory specs. Nothing special only diff. was the 1" spacer.
 
#19 ·
The Q-jet has very sensitive boosters. It is because of them, plus the diminutive size of the primaries that the Q-jet has the potential for "better" MPG.

Primary Flow for the Q-jet
175 to 185 CFM for 750 CFM Q-jets

210 to 225 CFM for 800 CFM Q-jets. The 225 CFM figure is only for the one-year '71 Pontiac 455 HO high-flow 4M Q-jet. It retained the 1-3/32” venturi, but lacked the outer velocity boosters found in all other models.
 
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