70LT-1 shielding

[Brad M.]

Re: 70LT-1 shielding

The pieces that Scott displayed mount to the block behind each valve cover.

[Mike G.]

Re: 70LT-1 shielding

ok so there are 4 total? 2 for each side? i will have to look through my junk and see if i have those.

[Harmon C.]

Re: 70LT-1 shielding

Scott, that is not what I was thinking of (although those pieces are somewhat related since they hold the wires), I was referring to the pieces that hold the lower rear shiedling on the car.

Here is a pic that shows one side shielding with brackets and wing bolts included

The brackets are bolted on with the exhaust manifold bolts. The little clips that hold two wires bolt on with 1/4" bolts below the spark plugs. Vendors sell sets of brackets as almost every one is shaped different and they take some time to get installed so the shield wing nuts will start.

[Harmon C.]

Re: 70LT-1 shielding

Here's one of them...



And there's a rubber grommet that fits into it to hold the s/p wires.

The threaded hole in the back of this bracket holds one of the upright shields.

[Harmon C.]

Re: 70LT-1 shielding

how many of those do i need? 1 each side?

I think you need eight wing bolts total but order extras as they get lost easy.

[Joe L.]

Re: 70LT-1 shielding

The LEFT side spark plug wire support pictured is still available from GM under the original part number, GM #3923971. The grommet is also available under GM #3719963.

The right side support is no longer available from GM.

Also, there should be a total of FOUR spark plug heat shields as others have noted. Please post a better picture of the 3 shields that you took off. I'm interested in seeing their configuration.

[Terry M.]

Re: 70LT-1 shielding

FWIW: There were only 3 heat shields on my early 1970 originally. I believe the left front was the one that was missing, but it might have been the right rear -- I would have to do an archeological dig to be sure, and even that might not be fruitful.

[Chuck S.]

Re: 70LT-1 shielding

so thats all the chrome pieces? i thought i would need a couple more larger outer pieces. does anyone have a pic of the L brackets i need. i can get the wingnuts.

If you have the AIM, the plug wire routing/ignition shielding is shown on UPC 6, Sheet B6, and UPC U69, Sheets A5, A6.

The angle brackets are for the rear outer covers; you'll need four, but the bad news is there are four different part numbers. My memory failed when I said they attached to the block with 1/4-20 screws...the AIM shows them attached under the exhaust manifold bolts.

I said the angle brackets were chrome plated...actually, with more thought the ones I saw may have been a bright zinc plate. The only configuration of these brackets (AIM calls them supports) I have seen are like a piece of angle with "legs" about 3/4" long and about 1/2" wide. At the 90 degree bend, a "gusset" has been formed into the angle corner by pressing or deforming the corner of the bend toward the inside of the angle...Hmmm, there's probably no way you'll be able to visualize that.

There are also two-wire clips that install under the oil pan screws that secure the plug wires to the bottom of the cylinder case; I remember these as a natural or a green oxide finish. How many and locations I don't know; you'll need the AIM as suggested, and even the AIM is not explicit...little bit of trial and error I expect for best fit to the side shields.

Of course, you'll also have the distributor shield supports that bolt to the intake manifold. IIRC, those are painted orange with the engine unless it's an LT1...the TIM&JG once said the distributor shield supports for LT1s with the aluminum manifold were painted orange with a brush; not sure what current thinking is on that.

[Joe L.]

Re: 70LT-1 shielding

FWIW: There were only 3 heat shields on my early 1970 originally. I believe the left front was the one that was missing, but it might have been the right rear -- I would have to do an archeological dig to be sure, and even that might not be fruitful.

Terry----


If yours is an early 70 with 1969-style shielding (i.e. 4 RF shields and the multi-component distributor shield), I would definitely expect only 3 spark plug shields. I don't think there's any easy way to mount the left front RF shield with a spark plug heat shield in place, even and especially the "special" spark plug heat shield with the hole for the temp sender in it (GM #3919807)

[Mike G.]

Re: 70LT-1 shielding

i am going to install all of this before i put the body on the car. that should help some. i will take some better pics tomorrow and post them. thanks for the help. i will also look through the boxes of 70 stuff that came off the car and see if i have the other stuff.

[Terry M.]

Re: 70LT-1 shielding

Of course, you'll also have the distributor shield supports that bolt to the intake manifold. IIRC, those are painted orange with the engine unless it's an LT1...the TIM&JG once said the distributor shield supports for LT1s with the aluminum manifold were painted orange with a brush; not sure what current thinking is on that.

To the best of my knowledge current thinking on the finish of the distributor shield supports has not changed. Once in a while we get it right the first time -- or as some folks say "Even the blind squirrel gets the nut once in a while."

[Mike G.]

Re: 70LT-1 shielding

[quote=Of course, you'll also have the distributor shield supports that bolt to the intake manifold. IIRC, those are painted orange with the engine unless it's an LT1...the TIM&JG once said the distributor shield supports for LT1s with the aluminum manifold were painted orange with a brush; not sure what current thinking is on that.[/quote]

the car is an lt-1. check out the pic in my second post. you can still see the brush marks. since the lt1 cars had aluminum intakes they could not spray them with the motor like the others. since the supports were on the motor it was easier to brush them orange than take them off and spray them. they could dry in place. seems like they could have sprayed them first but they did not. if they got paint on the intake they brushed that with dull aluminum paint. if you look at the pic, it looks like they used the same brush. you can see some silver in the brush marks. strange way to do it but thats what they did.

[Scott S.]

Re: 70LT-1 shielding

Scott, that is not what I was thinking of (although those pieces are somewhat related since they hold the wires), I was referring to the pieces that hold the lower rear shiedling on the car.

Here is a pic that shows one side shielding with brackets and wing bolts included

Ah, I misunderstood. You do need these to hold the upright pieces of the shielding or they'll flop all over, likely shredding the wires. I think the one I posted is for the left side, but I can't be sure. The one on the other side is different but I couldn't find a picture of it.

I can't believe how many pieces there are to this shielding setup!

[Chuck S.]

Re: 70LT-1 shielding

the car is an lt-1. check out the pic in my second post. you can still see the brush marks. since the lt1 cars had aluminum intakes they could not spray them with the motor like the others. since the supports were on the motor it was easier to brush them orange than take them off and spray them. they could dry in place. seems like they could have sprayed them first but they did not. if they got paint on the intake they brushed that with dull aluminum paint. if you look at the pic, it looks like they used the same brush. you can see some silver in the brush marks. strange way to do it but thats what they did.

Mike...You seem very well informed not to know what the ignition shielding looks like. You sure this wasn't a test?

[Terry M.]

Re: 70LT-1 shielding

Yes, Joe -- it is that 1969 style shielding
Terry