Mounting an Edelbrock 1407

So, my car('72 Skyalrk W/ a 455) has a Holley carb on it, when I ran the model numbers I found it was a 650CFM. Since finding that out I've been watching for used carbs as I cannot afford a new one for quite awhile. One of my friends this week told me he'd sell me his barely used Edelbrock 750 for $50.

What is the best way to mount this carb onto the stock intake? I've been searching around and seen adapters to go from square bore to spread bore around 1 inch thick, a really thin one that just seems like an aluminum plate and a couple gaskets, and several people in forums saying to just use a square bore gasket and it'll be fine. Anybody have any experience with what the best way to go is or if I should just skip it and watch for something else? Judging from most of the threads I've read around here I know the edelbrock 750 isn't most peoples favorites, but for $50 bucks it's got to be a heck of a lot better than a 650 Holley

 

Use the 1" square to spread bore adapter, check that everything clears (throttle valves can bind in the adapter) and enjoy your Edelbrock!

 

The intake is the stock iron but the carb has bolt holes for both so it will bolt on. However the throttle linkage hits the intake, looks like I need about another 1/2". How thick of a carb spacer can I run without running into hood clearance issues? Sounds like the 1" will probably be the way to go. The Holley was a spread bore

 

I think you are wasting your time with the adapter and $50 carb... I would save up and get a Q jet for a Buick bigblock application or another larger aftermarket carb.

 

I would love to get a nice big carb for it, but unless I stumble across 300 bucks it's just not going to happen for quite awhile. I know the 750 and adapter isn't ideal, but I can afford it and it's gotta be better than the 650 that's sitting on there right now.

 

I can't imagine a near new Edelbrock 750 would run worse that a 650 Holley that's sat for 10 years.

 

Blah blah blah everyone hates E-brock. The truth is they work perfectly well for everything except drag and dyno runs. Everyone that hates them is either not experienced with them or is making money off the competitors. They're great for what they're intended to do.

Basically you need the spacer. Some recomend just big enough to clear while others go with a 1" or larger. The idea is it increases the plenum volume by raising the carb and effectively giving you a slightly higher rise intake. I mainly recomend the 3/4"-1" since it's tall enough to clear everything without causing hood clearence issues.

Make sure it's the squarebore to spreadbore adaptor type.

Use a gasket above and below the spacer. I tend to put them on dry.

The air cleaner may or may not fit. Depends on the throat diameter of the Holley. If it's the same diameter than the air cleaner should fit. The exception is on electric chokes because sometimes the air cleaner base hits the top of the choke coil housing. They sell spacer rings though that'll raise the base 1/4" to clear everything.

I can't help on the linkage connections and stuff as I haven't gotten to that point with mine yet. I know they pop right onto Chevys, Pontiacs and Olds though.

 

So would a Q-Jet like this one be a better purchase do you think?

http://cgi.ebay.com/ebaymotors/quadrajet-17056230-1976-cadillac-500-eng-deville-eldora-_W0QQcmdZViewItemQQhashZitem2a0f449e79QQitemZ180644781689QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

 

Like I said, if I had 300+ Dollars I would love to get a new big CFM carb, but $200 is the absolute most I can put towards a carb for quite awhile. That one on ebay would run me just under 200 shipped and if I'm not mistaken the Caddy 500 used the 800 CFM model.

Taken from a post by Clif R, whom by what I can gather is pretty well respected for carb knowledge "Basically, the "best" q-jets would be any later model carburetor from 1976 and up with the later APT system. All front inlet models (non computer controlled) will be the larger castings."

Which seems to be what the carb in the auction is.

 

If you're not in a super big hurry I'll have a Buick 800cfm up for sale in a few weeks. Selling it off to fund my build and to make room for the E-brock 1411 :laugh:

 

I had a 750 edelbrock on a stock manifold for 76 buick electra with 455cid. I used the 1 inch adapter and had to use a few washers for the accel cable bracket to "rise up" to meet the carb. I found a nice low profile edelbrock air cleaner assy that allowed the hood to close with clearance for closure and engine torque movement.

I liked the performance of the Edelbrock manual choke unit. It pushed hard in Minnesota humid summers and ran well in the 20 below zero morning start ups.(yes, I had to drive her in the winter, hence the reason i had to demo it and bought my 72 Lesabre which wil get the same set up). I found carb used on ebay for $250 at the time, adaptor at Jegs.

Good luck with whatever you choose.

 

I have an Edelbrock 750 on my 350 with the 1" adapter. The throttle bracket had to be modified slightly (moved about 3/4" to the drivers side) to allow free operation, other than that it suits me just fine.

I am sure that there are a lot of nay sayers out there - all I know is it works.