Intake/Carb Gasket for 1970 LS-5

[Tony H.]

I am wondering what gasket goes to my intake/carb interface. I am away from my AIM and parts book and catalogs. I called a local Chevy dealer and they gave me a part number #3967470 but said they cannot get them anymore nor could they give me any dimensions. At NAPA, their carb rebuild kit comes with a thin gasket (1/16" inch or so)for the carb/intake interface while their individual gasket catalog gave them a part number which calls for another thin gasket only it's shaped like a holley carb gasket (obviously wrong). The 71-72 carb/intake gaskets are about 1/4" thick and of the correct Rochester shape. What did my car come with originally? What is the thickness (approx) for that gasket?

[Joe L.]

Re: Intake/Carb Gasket for 1970 LS-5

Tony-----

Well, your Chevy parts man is correct. The original gasket for your car (UNLESS your car happens to be an original California-delivered car with EEC) was GM #3967470 and this gasket is GM-discontinued. This gasket was a composition with steel core gasket approximately 3/32" thick. It had one large plenum opening which was sort of "hour-glass" shaped. There were no individual holes for the carb bores like the 68-69 Q-Jet gaskets. Although discontinued, this gasket is available in reproduction from, I expect, sources like Dr. Rebuild. He's usually got gaskets "covered", so I expect that he has this one.

In the event that you have a 1970 which WAS equipped originally California-delivered and equipped with EEC, the gasket was originally GM #3969837. Currently, it is known as GM #10147945 and this gasket is still available. This gasket is an asseembly consisting of a gasket similar to the 3967470 attached to a relatively large, irregularly-shaped aluminum plate.

[Tony H.]

Re: Intake/Carb Gasket for 1970 LS-5

I did get the gasket you described with a metal core from NAPA but it was not listed in their catalog for my particular application.

I do happen to have Dr Rebuild's catalog here at work (thought I left it at home) and it lists the gasket you mention as well as a "heat insulator" that resembles the approx. 1/4" thick gasket that I mentioned in my original post. The heat insulator is listed for 70-80 applications and is different from the CA cars. Should my non-CA emisions car also have a heat insulator or not?

[Joe L.]

Re: Intake/Carb Gasket for 1970 LS-5

Tony-----

I do not think that the thick insulator was used for 1970 non-EEC cars. The insulator of which you speak was GM 3998919 which was replaced in SERVICE several years ago by GM #10069984. I believe that this insulator/gasket was first used on a production Corvette in 1971 or 1972. I'll check later and confirm when I can get to my references. This insulator can, however, be used on a 1970 Corvette with Q-Jet. In this usage, it would REPLACE the gasket that I previously described. You would also have to fabricate a new automatic choke rod to compensate for the 1/4" or so of additional thickness.

[Joe L.]

Re: Intake/Carb Gasket for 1970 LS-5

Tony-----

Just confirmed that the thick insulator type gasket was NOT used on 1970 Corvettes with Q-Jets and without EEC.

[Roberto L.]

Re: Intake/Carb Gasket for 1970 LS-5

Just for reference, the gasket mentioned by Joe for 70 California vettes is shown in the link below.

Roberto, NCRS #30019, RMC


California delivered carb gasket

[Mike Andresen (27410)]

Re: Intake/Carb Gasket for 1970 LS-5

Roberto, You're making me jealous of the digital camera. A picture is worth a 1000 words.

Cheers, Mike

[Roberto L.]

Re: Intake/Carb Gasket for 1970 LS-5

Hello Mike, I would love to have a digital camera but no way for now. I try to take good pictures and then scan them to use in the website and the like. But quality suffers with all those steps. Any way I will try to obtain detailed photos of original parts in my 70 (or other cars) for reference. All best, Roberto, NCRS #30019, RMC

[Juliet P.]

Re: Intake/Carb Gasket for 1970 LS-5

Tony, if it turns out you need P/N 1014-9745, the Q-jet carb gasket that goes with the Calif emissions setup, give a holler before I put it on eBay. ~Juliet


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