70 bolt ID help

[Bill L.]

I have the bolt pictured below but have no idea where it belongs.

Anyone have any thoughts on where it belongs on my 70?

Thanks, BillNAT Bolt 2.jpgNAT Bolt 1.jpg

[John H.]

Re: 70 bolt ID help

I have the bolt pictured below but have no idea where it belongs.

Anyone have any thoughts on where it belongs on my 70?

Thanks, Bill[ATTACH=CONFIG]56647[/ATTACH][ATTACH=CONFIG]56648[/ATTACH]

What's the thread size and the length (from bottom of head to end of bolt)?

[Bill L.]

Re: 70 bolt ID help

What's the thread size and the length (from bottom of head to end of bolt)?

Hi John,

3/8"-16 x 1-1/2" long

Thanks, Bill

[Joe L.]

Re: 70 bolt ID help

Hi John,

3/8"-16 x 1-1/2" long

Thanks, Bill

Bill------


Seems like I've seen these "NAT" headmarked bolts used for bumper, radiator support or frame horn attachment.

[Bill L.]

Re: 70 bolt ID help

Bill------


Seems like I've seen these "NAT" headmarked bolts used for bumper, radiator support or frame horn attachment.

Hmm-I wonder if it might be a bolt that holds the front bumper on to the body on the side. GM 427559.

Bill

[David L.]

Re: 70 bolt ID help

Hmm-I wonder if it might be a bolt that holds the front bumper on to the body on the side. GM 427559.

Bill

Bolt # 427559 appears in my 1969 Chevrolet Parts catalog (10/68) in Gr. 8.900 and is described as hex head bolt 3/8"-16 X 2" (300-M).

Dave

[Bill L.]

Re: 70 bolt ID help

Bolt # 427559 appears in my 1969 Chevrolet Parts catalog (10/68) in Gr. 8.900 and is described as hex head bolt 3/8"-16 X 2" (300-M).

Dave

Hi Dave,

Hope you are well.

That rules out that location. The bolt is clearly 1-1/2" long.


Bill

[David L.]

Re: 70 bolt ID help

Bill,

I believe that the 67-72 fuel pump bolts, GM # 3778526, are 3/8"-16 X 1 1/2" with an attached lock washer but the head of this bolt usually has a ridge around the perimeter.

Dave

[Bill L.]

Re: 70 bolt ID help

Bill,

I believe that the 67-72 fuel pump bolts, GM # 3778526, are 3/8"-16 X 1 1/2" with an attached lock washer but the head of this bolt usually has a ridge around the perimeter.

Dave

I checked and the original bolts are there for the fuel pump and the bolts are the indented hex head .

Bill

[Rich P.]

Re: 70 bolt ID help

Bill 1-1/2 3/8-16 could be AIR Pump bracket to intake manifold. The outer bumper bracket bolt you thought is a grade 8. Rich.

[Bill L.]

Re: 70 bolt ID help

Bill 1-1/2 3/8-16 could be AIR Pump bracket to intake manifold. The outer bumper bracket bolt you thought is a grade 8. Rich.

Hi Rich,

Hope you are well. 70 does not have an air pump on L46.

Good thought.


Thanks, Bill

[Dallas K.]

Re: 70 bolt ID help

How about the bolts that hold the gas tank straps at the rear cross frame.

[Joe L.]

Re: 70 bolt ID help

How about the bolts that hold the gas tank straps at the rear cross frame.

Dallas------



Those were all-thread bolts. They had no un-threaded shank.

[Bill L.]

Re: 70 bolt ID help

How about the bolts that hold the gas tank straps at the rear cross frame.

Thanks Dallas.

I bagged and tagged the bolts holding the gas tank straps and they are reinstalled.

I was thinking it kind of looks like an intake manifold bolt. However all mine were reinstalled and have an A head mark.

This is really stumping me.

Bill

[Alan S.]