Another carburetor question
Thread Starter
Team Owner
Joined: Jul 2008
Posts: 23,419
Likes: 22
From: In limbo
St. Jude Donor '13-'15, '17 thru '22
Another carburetor question
So, I ordered a new Holley 0-6210, a 650 cfm spreadbore carb for my car (1970, LS5). I am looking at the installation instructions, and the first instruction reads:
Interestingly, when I took my old carb off, I had a gasket that looked like gasket B (meaning it was intended to have the ss plate) but no ss plate. Later in the instructions, it says this:
So, given what I found, and that the mechanic said the carb wasn't working correctly because it had clogged with carbon, I'm thinking that whoever installed that carb didn't use the SS plate when they were supposed to, and ruined the carb. The question is, is there any way to be sure? Does anyone know for sure if I need the SS plate or not, or some way to tell by looking at the intake manifold or other location whether I need it or not?
Any other thoughts appreciated.
PK
A steel reinforced gasket plus a thin stainless steel plate (used to cover the exhaust heat track or slot in the front of the intake manifold) can be found. Carefully remove both the steel plate and the gasket. Clean the manifold surface. Install the new gasked (gasket B), re-install the steel plate....If there is a standard type gasket with no stainless steel plate, replace this with the thin one supplied (gasket A)
Holley Model 4165 (spreadbore) carburetors that have carbon deposits in the areas shown by the arrows (there is a picture here) will not be accepted for warranty. The deposit is evidence of improper installation (not using the stainless steel plate where required) for which Holley cannot assume liability.
Any other thoughts appreciated.
PK
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Here is a link with a manifold that needs it.You can see one end of the groove under the Edelbrock can.
http://www.lbfun.com/warehouse/tech_...ntake_Swap.pdf
http://www.lbfun.com/warehouse/tech_...ntake_Swap.pdf
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
That's not the smiley face manifold. You don't need the ss plate.
The Smiley manifold has a slot ahead of the primaries that is only about 1/2" wide all the way across and has a hole at each end to the exhaust.
However, here in hot Florida, I do use the ss plate on all carbs, it helps with keeping the fuel a little cooler and prevent a little evaporation in this heat. It might be too cold though in the cooler temps up north.
You can get the ss at Advance Auto or Parts America online.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Not sure now and I didnt realize you have a big block. The reason for the plate is to shield the carb from the exhaust that flows through the groove. On the small block at both ends of the groove are holes that are drilled through to the crossover exhaust.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Team Owner
Joined: Jul 2008
Posts: 23,419
Likes: 22
From: In limbo
St. Jude Donor '13-'15, '17 thru '22
Here's what I am thinking: If I need it, and don't use it, I can ruin another carb within 600 miles. If I don't need it, and put one on anyway, is there any downside? Keeping the carb cooler and stopping some of the evaporation that stinks up my garage sounds like a good thing to me. So, unless there is some major downside, I am thinking of just ordering one, putting it on, and hopefully, being done with it.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Here's what I am thinking: If I need it, and don't use it, I can ruin another carb within 600 miles. If I don't need it, and put one on anyway, is there any downside? Keeping the carb cooler and stopping some of the evaporation that stinks up my garage sounds like a good thing to me. So, unless there is some major downside, I am thinking of just ordering one, putting it on, and hopefully, being done with it.
Thread Starter
Team Owner
Joined: Jul 2008
Posts: 23,419
Likes: 22
From: In limbo
St. Jude Donor '13-'15, '17 thru '22
Today, I finished the installation and tuning of a new Holley Spreadbore 650. I took it out for a ride, and unintentionally screeched the tires twice, so the car seems to be back(knock wood)!
Thanks for all the help! This forum has been an incredibly valuable resource for me on this continuing adventure!
Thanks for all the help! This forum has been an incredibly valuable resource for me on this continuing adventure!
CF Community Team
Joined: Oct 2004
Posts: 19,353
Likes: 5,240
From: Cape Cod, Mass.
2025 C6 of the Year Finalist - Unmodified
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
Today, I finished the installation and tuning of a new Holley Spreadbore 650. I took it out for a ride, and unintentionally screeched the tires twice, so the car seems to be back(knock wood)!
Thanks for all the help! This forum has been an incredibly valuable resource for me on this continuing adventure!
Thanks for all the help! This forum has been an incredibly valuable resource for me on this continuing adventure!
Glad it worked out. It really livened up my big block 
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
The Holley spreadbore carbs are excellent for street use imho. I have the 4175 Vacuum Sec model and it is very crisp and responsive and the secondaries are fast and smooth! 
