Tech 2002 General Tech questions from 2002
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post #1 of 4 (permalink) Old Jul 7th, 02, 04:12 PM Thread Starter
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Join Date: Oct 1998
Posts: 630
I am having a problem with my new 383 stroker motor and want to isolate the problem. I want to eliminate the possibility of a carb problem by putting my edelbrock carb which I know worked fine on my old engine onto the new engine which has a holley carb on it.I need to know if there is a special plate I need to connect to the edelbrock carb to fit the edelbrock rpm performer manifold I have. When I place it ontop of the manifold, it doesnt line up with the holes. Any part number would be greatly appreciated as well. Thanks In advance.
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post #2 of 4 (permalink) Old Jul 7th, 02, 08:24 PM
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Join Date: Oct 2000
Location: Lexington, KY
Posts: 771
It depends on what type of carburetors you have. There are two major types of bolt patterns, square bore and spread bore. Most performance carburetors and intake manifolds are square bore. This means that if you connecte the centers of the mounting holes, you will get a square. Your Performer RPM intake should be square bore, mine is. It sounds as if your Edelbrock carburetor is spread bore. This was used on most GM cars and trucks. It is the same bolt pattern used on the Rochester Quadrajet. If this is the case, you will need a spread bore to square bore adapter plate. Most auto parts stores carry a square bore to spread bore adapter for installing square bore carburetors on spread bore intakes. I don't know if this adapter plate is reversible or not, but it would be worth looking into.
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post #3 of 4 (permalink) Old Jul 8th, 02, 07:33 AM
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Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
The Carter AFB based Edelbrock cars are kind of a spread bore, but will go on most- if not all- square bore intakes. a Q-jet is most definitely a spread bore, with really tiny primaries for throttle response and driveability, and HUGE secondaries for power up high. it is because of the huge secondaries that you can't use it on just any intake without an adapter. the adapter you need isn't a "spread bore to square bore" adapter- it is just a square bore spacer with a set of holes on the inside with studs sticking out to mount the Edelbrock carb- unless you have an Edelbrock Q-jet like I do, then you need the full blown spread bore/square bore adapter.
actually, now that i think about it, isn't an Edelbrock/Carter carb drilled for both mouting patterns right on the baseplate? seems to me that the Carter i have out in the shop is.

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post #4 of 4 (permalink) Old Jul 8th, 02, 02:53 PM Thread Starter
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Join Date: Oct 1998
Posts: 630
Yes I have an EDELBROCK q jet. I think I will need the full spread bore to square bore adapter. DO you have a picture of it? I have seen the spread bore to square bore adapter on the edelbrock page but they say it is for a single plane manifold not the dual plane.
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