edelbrock carb and stock manifold ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 06-14-2004, 05:32 PM

im putting an edelbrock carb on my 72 /350. the guy at the parts store got the carb for me and i asked for the adapter plate for my truck. he grabbed one, an open one. that is, on with one big hole.

i didnt think much about it, i came home and put everything on. im short a few little things before i fire it up so.. lol, now i decide to look at the instructions.

i read here that for gm products with qjets, it says not to use the open adapeter. i guess i need the one with the 4 holes in it. %(#$# every thing is on now, i hate to have to rip it back apart.

did the parts guy screw up? am i reading this wrong? do i need to go get the right adapter?

Bowtie67 · 06-14-2004, 05:38 PM

How does it run, I have used open adapters without any issues. You did put gaskets on both sides of the adapter? and all hoses hooked up properly?

mtdave2 · 06-14-2004, 05:46 PM

i havent fired it up yet. i still need some fule line, and some other small things.

its just strange that they have a big photo of the adapter i have with the big x thru it. lol..

ya, i do have gaskets on both sides, and i didnt over tighten the bolts!

Bowtie67 · 06-14-2004, 05:52 PM

Way back before the performer and and rpm manifold there was the stock gm Hirise Z28 manifold and one of the mods to the manifold wass to grind out some of the divider wall 1" down and 1" in from the sides. this increased your rpm band 100 - 200rpm, the same thing applies to adding a spacer between the carb and manifold, so instead of calling it an adapter call it a spacer, problem solved..

crazy longhorn · 06-14-2004, 06:19 PM

I agree, crank it up & see how she runs......an open spacer is a "mixed bag" of chit.....sometimes they work, & sometimes they dont

best of luck & let us know how it goes.....crazyL

piecesparts · 06-14-2004, 06:21 PM

The power building articles in Chevy High Performance, say that the spacer with 4 holes will give a better flow pattern and power band than the open hole. The four hole unit helps align the flow from the carb to the manifold and eliminates the perturbation that happens just below the carb mounting plate. The turbulence created there will hurt low end performance and cause the engine to run irregular in a off-idle to mid-throttle acceleration.

mtdave2 · 06-14-2004, 11:19 PM

dam i was feeling better till that last post.. doh!

06-14-2004, 05:32 PM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	edelbrock carb and stock manifold ? im putting an edelbrock carb on my 72 /350. the guy at the parts store got the carb for me and i asked for the adapter plate for my truck. he grabbed one, an open one. that is, on with one big hole. i didnt think much about it, i came home and put everything on. im short a few little things before i fire it up so.. lol, now i decide to look at the instructions. i read here that for gm products with qjets, it says not to use the open adapeter. i guess i need the one with the 4 holes in it. %(#$# every thing is on now, i hate to have to rip it back apart. did the parts guy screw up? am i reading this wrong? do i need to go get the right adapter? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 06-14-2004 at 05:48 PM.

06-14-2004, 05:38 PM	#2
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	How does it run, I have used open adapters without any issues. You did put gaskets on both sides of the adapter? and all hoses hooked up properly? __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them"

06-14-2004, 05:46 PM	#3
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	i havent fired it up yet. i still need some fule line, and some other small things. its just strange that they have a big photo of the adapter i have with the big x thru it. lol.. ya, i do have gaskets on both sides, and i didnt over tighten the bolts! __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

06-14-2004, 05:52 PM	#4
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	Way back before the performer and and rpm manifold there was the stock gm Hirise Z28 manifold and one of the mods to the manifold wass to grind out some of the divider wall 1" down and 1" in from the sides. this increased your rpm band 100 - 200rpm, the same thing applies to adding a spacer between the carb and manifold, so instead of calling it an adapter call it a spacer, problem solved.. __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them"

06-14-2004, 06:19 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	I agree, crank it up & see how she runs......an open spacer is a "mixed bag" of chit.....sometimes they work, & sometimes they dont best of luck & let us know how it goes.....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

06-14-2004, 06:21 PM	#6
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	The power building articles in Chevy High Performance, say that the spacer with 4 holes will give a better flow pattern and power band than the open hole. The four hole unit helps align the flow from the carb to the manifold and eliminates the perturbation that happens just below the carb mounting plate. The turbulence created there will hurt low end performance and cause the engine to run irregular in a off-idle to mid-throttle acceleration.

06-14-2004, 11:19 PM	#7
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	dam i was feeling better till that last post.. doh! __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban



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