Can anyone help me find a heat shield number 3815084 or a right rear plug shield for a 71 lt1. All the others are availible thru gm and i have them but they show the right rear as being 3917664 and it is not right. Tried a number search and nothing found. Also need advise on where to buy a correct numbers match fuel pump or if another lt1 owner has bought one. Thank Chuck
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Re: 71 lt1 plug heat shield
Chuck-----
Spark plug heat shield GM #3815084 was discontinued from SERVICE in May, 1968 and replaced by the GM #3917664 at that time. However, the 3917664 has now been discontinued, too.
Even though the AIM may show the 3815084 as being used for 1971 LT-1, I doubt that piece was actually used. I would expect that the 3917664 replaced it for PRODUCTION at about the same time as it replaced it for SERVICE, if not somewhat earlier.
Have you found some fitment problem using a GM #3917664 for the right rear position?In Appreciation of John Hinckley -
Re: 71 lt1 plug heat shield
I was able to get and have the 3917664 at the dealership where i work but it didnt have the hole like the left front temp sensor so i thought it was incorrect because of the tcs sensor. The 664 looked similar to the 657 i again thought it was not right.Comment
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Re: 71 lt1 plug heat shield
Sorry and no i didnt try it.Comment
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Re: 71 lt1 plug heat shield
Chuck------
The shield used for the left front (the one with the hole in it) is GM #3919807. It's still available from GM. However, I have no information that it was ever used for the right rear position. It does seem logical that it would have been since the TCS switch at the right rear position is, basically, the same in configuration as the temperature sender at the left front position. I just do not ever recall seeing this shield at the right rear position. It's possible it was used, though. We need to hear from someone with an original 71-75 small block. The shield configuration and parts usage was the same for all small blocks over that period and was, by no means, unique to the LT-1.In Appreciation of John HinckleyComment
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Re: 71 lt1 plug heat shield
Joe, I think around 71 sometime they only used the two rear most sheilds, There were 4 sheilds on the 68-70 I think, if were talking the chrome sheilds.Last edited by Edward J.; May 1, 2010, 03:55 PM.New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.Comment
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Re: 71 lt1 plug heat shield
Ya thats what i think but i dont know i can go to work yet and get the part but i just dont think its right so im going to hang in hear and see if anyone else replys i can get it monday. This is a very simple problem to solve if a lt1 car guy sees my post. I think ill post an add in driveline. Thank you for helping me ChuckComment
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Re: 71 lt1 plug heat shield
My recollection is the change (from 2 RF sheilds per side to only having shields on the rear plug banks) happened in late '70 when the distributor was changed to put shields inside the cap and Corvette made the transition from the 'big' full box distributor shield to the partial, L-shaped, distributor shield...
Further, my recollection is the reason for going from no RF shields beneath the distributor cap to having them was to reduce RF noise that was getting to the new Chevy passenger car option of having the radio antenna embedded in the windshield glass.
My hunch is the Corvette designers found they could cost reduce the SB radio RF shielding (eliminate the shields on the front two plug banks and go from a two to one piece discrete distributor sheild) if they adopted the passenger car system of shields over the ignition points inside the distributor...Comment
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Re: 71 lt1 plug heat shield
Edward------
I think we're talking about 2 different sets of shields here. The shields you're referring to are the radio interference (RF) shields. Beginning sometime in 1970, the front RF shields on both sides were eliminated.
However, I think the original question involves the spark plug heat shields. These were used for all 4 positions for 1971 as well as many years before and many years after. In any event, the shield originally mentioned is a GM #3815084 and that shield is a spark plug heat shield. All of the shields I mentioned are spark plug heat shields, too.In Appreciation of John HinckleyComment
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Re: 71 lt1 plug heat shield
Not talking about the ignition shielding i am tring to just get my original manifolds on the motor it had hooker side pipes on it when i bought it but got the manifolds and swedged down pipes with the car though. just simple need held with a picture or a clear and knowing answer to what RR spark plug heat shield was used to clear the tcs sensor and no not the ignition shielding. Thanks ChuckComment
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Re: 71 lt1 plug heat shield
Hi Chuck,
Here are a couple of pictures of the left rear heat shield installed. You'll see the 2 brackets and wing-nuts for the radio interference shield are in place. I posted 2 pictures of the shield off the engine in your other thread which I saw first
Regards,
Alan71 Coupe, 350/270, 4 speed
Mason Dixon Chapter
Chapter Top Flight October 2011Comment
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Re: 71 lt1 plug heat shield
Now thats what i was looking for thank you so much after my last post i went to ebay and found an lt1 71 for sale and the guy just happened to have a picture of the right rear with a ignition shield on it and i could tell by the picture the left front plug shield would not work because it looks like a big v pointing up and the ignition shield is more of a bump where the tcs sensor is and oviously the ignition shield provides the heat shielding because the plug shield goes underneath it but i didnt know that. Your car is so nicely detailed it looks great. Thanks ChuckComment
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