16
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 07, 2009, 03:39:22 AM »
Makes sense - so how did they keep orange paint from clogging the threaded bolt holes for the motor mounts?
Steve
Steve
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17
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 01:12:03 AM »
WHEW! 
Glad that's over with. 
OK, now for some observations & questions:
1) Were the motor mounts assembled to the block prior to the BB painting process at Tonawanda?
Would there have been any orange over spray on these motor mounts ( see the original mounts at the beginning of this thread )?
2) Were the BB motor mounts 3920627 ( 3937930 ) used throughout the 1969 production year?
When were these mounts discontinued from production use? Why do these mounts have two different part numbers molded on them?
When was the left side stop bracket assembly discontinued from production? Did it make it into the 1970 model year?
3) When did the BB engine frame brackets 3980941 & 3980942 replace 3950113 & 3950114?
4) Using the AIM as a reference, no part number could be found for the right hand long motor mount bolt.
Extrapolating on the information I could find, it appears that possibly the standard 8 cylinder long motor mount bolt: 3980716 appears to be
the correct part number for use on the passenger side motor mount of the 302, 350, 396, and 427. See AIM – page 87. Can someone
reference a 1969 parts manual and tell me if I am correct in my assumption?
So sorry to all the Z/28 & L/48 guys here. Until I got into the research on this topic, I didn't know that the these cars used a similar stop bracket. Odd that
a thru bolt and nut assembly was used on the Z & SS and the big block used the threaded receiver. Are there any Z/28 or L/48 owners here that can post images of
their motor mount components? I'd like to see them for comparison purposes.
OK - I welcome responses.
Nuch
Glad that's over with. OK, now for some observations & questions:
1) Were the motor mounts assembled to the block prior to the BB painting process at Tonawanda?
Would there have been any orange over spray on these motor mounts ( see the original mounts at the beginning of this thread )?
2) Were the BB motor mounts 3920627 ( 3937930 ) used throughout the 1969 production year?
When were these mounts discontinued from production use? Why do these mounts have two different part numbers molded on them?
When was the left side stop bracket assembly discontinued from production? Did it make it into the 1970 model year?
3) When did the BB engine frame brackets 3980941 & 3980942 replace 3950113 & 3950114?
4) Using the AIM as a reference, no part number could be found for the right hand long motor mount bolt.
Extrapolating on the information I could find, it appears that possibly the standard 8 cylinder long motor mount bolt: 3980716 appears to be
the correct part number for use on the passenger side motor mount of the 302, 350, 396, and 427. See AIM – page 87. Can someone
reference a 1969 parts manual and tell me if I am correct in my assumption?
So sorry to all the Z/28 & L/48 guys here. Until I got into the research on this topic, I didn't know that the these cars used a similar stop bracket. Odd that
a thru bolt and nut assembly was used on the Z & SS and the big block used the threaded receiver. Are there any Z/28 or L/48 owners here that can post images of
their motor mount components? I'd like to see them for comparison purposes.
OK - I welcome responses.
Nuch
18
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:59:50 AM »
Original motor mount to engine block bolts:
Note that the left side bolts ( 3768390 ) are longer than the right side bolts ( 3748038 )
to compensate for the thickness of the stop bracket.
Note that the left side bolts ( 3768390 ) are longer than the right side bolts ( 3748038 )
to compensate for the thickness of the stop bracket.
19
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:55:34 AM »
Original long motor mount bolt components ( SEE PART LIST FOR NUMBERS ):
20
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:52:03 AM »
3950113 & 3950114 engine frame bracket comparison ( notice the height difference - left side is taller ):
21
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:50:21 AM »
Original 3950114 right hand engine frame bracket:
22
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:47:14 AM »
Original big block right hand motor mount assembly:
Close-up view of bolt:
Close-up view of bolt:
23
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:42:46 AM »
Original stop bracket 3977983:
24
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:41:24 AM »
Original motor mount ( NOS ) 3920627:
Close-up of threaded receiver:
Close-up of threaded receiver:
25
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:38:53 AM »
Original 3950113 left hand engine frame bracket:
26
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: March 01, 2009, 12:35:19 AM »
Original big block left hand motor mount assembly:
Close-up view of bolt & locking bracket assembly:
Close-up view of bolt & locking bracket assembly:
27
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: February 28, 2009, 11:51:12 PM »
I will be posting images of the motor mount components shortly.
Nuch
Nuch
28
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: February 28, 2009, 11:47:46 PM »
Here is the AIM page pertaining to the standard 8-cylinder right hand motor mount assembly.
29
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: February 28, 2009, 11:44:30 PM »
Here is the AIM page pertaining to the small block ( Z/28 & SS-350 ) left hand motor mount assembly.
The part highlighted in orange is the small block version of the locking bracket.
Parts List:
The part highlighted in orange is the small block version of the locking bracket.
Parts List:
30
Originality / Re: Original long bolts for 1969 L/78 motor mounts
« on: February 28, 2009, 11:40:50 PM »
Here is the AIM page pertaining to the big block left hand motor mount assembly.
The part highlighted in red is the odd locking bracket I referenced initially.
Parts List:
The part highlighted in red is the odd locking bracket I referenced initially.
Parts List: