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#1 |
Registered User
Join Date: Feb 2019
Location: So Cal, CA
Posts: 108
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Plastic phenolic spacer
So yes, I added one after researching on here about vapor lock. I added a one inch edelbrock brand. Sure, my vapor lock is gone, but I sure as heck cant get the truck to idle smooth. I'm suspecting vacuum leak from gasket or spacer. Anyone have problems getting the plastic spacers to seal? It has two edelbrock gaskets. I've tightened down the carb bolts a couple times thinking they were tight, but don't want to strip the bolt holes or crack the spacer but i sure as heck cant stop this rough idle. Cruises fine.
71 c20 longhorn, 350, edelbrock 1406, aluminum edelbrock intake (both were already installed when I bought this truck a year ago).
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1971 C20 Longhorn 350/350 "Conquistador" Last edited by vitamin_c95; 04-24-2020 at 11:19 PM. Reason: Updated the 2 gaskets added to be a thorough description |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,616
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Re: Plastic phenolic spacer
We assume you have a gasket then the spacer and then another gasket then the carb.
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#3 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,137
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Re: Plastic phenolic spacer
It's not uncommon for those spacers to be warped or the top and bottom sometimes are not true to each other. Wet sand the top and bottom with the sand paper on a piece of glass to remove the warpage. That will also help if the surfaces are not true to each other.
A couple of metal rulers can be used to find differences in the surfaces by placing the spacer on a true surface and hold a ruler on the top with half the ruler off of the spacer and measure the distance between the true surface and the bottom of the ruller and record the number then repeat on all four sides. By having the ruler stick past the end of the spacer 6 inches or so will make any problem with the surfaces being out of place more apparent .
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#4 |
Registered User
Join Date: Feb 2019
Location: So Cal, CA
Posts: 108
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Re: Plastic phenolic spacer
Correct. 2 edelbrock gaskets
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1971 C20 Longhorn 350/350 "Conquistador" |
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#5 | |
Registered User
Join Date: Feb 2019
Location: So Cal, CA
Posts: 108
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Re: Plastic phenolic spacer
Quote:
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1971 C20 Longhorn 350/350 "Conquistador" |
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#6 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,137
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Re: Plastic phenolic spacer
You're welcome and good luck,
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Plastic phenolic spacer
I've never stacked the spacers. No gasket required between? Would that not help with the minor irregularities?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#8 |
Registered User
Join Date: Feb 2019
Location: So Cal, CA
Posts: 108
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Re: Plastic phenolic spacer
Manifold>gasket>spacer>gasket >carb
Just a single one inch spacer
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1971 C20 Longhorn 350/350 "Conquistador" |
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#9 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: Plastic phenolic spacer
Spray carb cleaner around the base with engine running, if RPM's change you'll find your leak.
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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#10 |
Registered User
![]() Join Date: Oct 2017
Location: Hudson Valley, New York
Posts: 643
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Re: Plastic phenolic spacer
Just what I was thinking. Had something similar and this located the issue.
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'68 C20 Utility 396 4sp (BuildThread: http://67-72chevytrucks.com/vboard/s...d.php?t=806904 ) '68 C10 50th |
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#11 | |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Plastic phenolic spacer
Quote:
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__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#12 |
Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,921
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Re: Plastic phenolic spacer
I have had a couple spacers where hollow underneath that caused issues. One let there be a leak between it and the manifold. Had another where when stacked had a slight gap due to milling differences. Be careful clamping the gaskets as they will leak if the carb base is being warped by bolt torque. I really like the thicker factory quadrajet gasket for stopping leaks. With some digging at jegs or summit you can find them for square bore carbs. As a last ditch effort a little silicone sealer between the intake and spacer should work also. Just don't go thick.
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